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/cfg.c b/net/mac80211/cfg.c
index 1063a7e..2577c45 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -832,7 +832,7 @@
}
if (params->ht_capa)
- ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
+ ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
params->ht_capa,
&sta->sta.ht_cap);
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 988c7ec..7e0ac97 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -18,7 +18,82 @@
#include "ieee80211_i.h"
#include "rate.h"
-void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
+bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata)
+{
+ const __le16 flg = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40);
+ if ((sdata->u.mgd.ht_capa_mask.cap_info & flg) &&
+ !(sdata->u.mgd.ht_capa.cap_info & flg))
+ return true;
+ return false;
+}
+
+void __check_htcap_disable(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_sta_ht_cap *ht_cap,
+ u16 flag)
+{
+ __le16 le_flag = cpu_to_le16(flag);
+ if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) {
+ if (!(sdata->u.mgd.ht_capa.cap_info & le_flag))
+ ht_cap->cap &= ~flag;
+ }
+}
+
+void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_sta_ht_cap *ht_cap)
+{
+ u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask);
+ u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask);
+ int i;
+
+ if (sdata->vif.type != NL80211_IFTYPE_STATION) {
+ WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION);
+ return;
+ }
+
+ /* NOTE: If you add more over-rides here, update register_hw
+ * ht_capa_mod_msk logic in main.c as well.
+ * And, if this method can ever change ht_cap.ht_supported, fix
+ * the check in ieee80211_add_ht_ie.
+ */
+
+ /* check for HT over-rides, MCS rates first. */
+ for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
+ u8 m = smask[i];
+ ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
+ /* Add back rates that are supported */
+ ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
+ }
+
+ /* Force removal of HT-40 capabilities? */
+ __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
+ __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);
+
+ /* Allow user to disable the max-AMSDU bit. */
+ __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
+
+ /* Allow user to decrease AMPDU factor */
+ if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
+ IEEE80211_HT_AMPDU_PARM_FACTOR) {
+ u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
+ & IEEE80211_HT_AMPDU_PARM_FACTOR;
+ if (n < ht_cap->ampdu_factor)
+ ht_cap->ampdu_factor = n;
+ }
+
+ /* Allow the user to increase AMPDU density. */
+ if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
+ IEEE80211_HT_AMPDU_PARM_DENSITY) {
+ u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
+ IEEE80211_HT_AMPDU_PARM_DENSITY)
+ >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
+ if (n > ht_cap->ampdu_density)
+ ht_cap->ampdu_density = n;
+ }
+}
+
+
+void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_supported_band *sband,
struct ieee80211_ht_cap *ht_cap_ie,
struct ieee80211_sta_ht_cap *ht_cap)
{
@@ -102,6 +177,12 @@
/* handle MCS rate 32 too */
if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
ht_cap->mcs.rx_mask[32/8] |= 1;
+
+ /*
+ * If user has specified capability over-rides, take care
+ * of that here.
+ */
+ ieee80211_apply_htcap_overrides(sdata, ht_cap);
}
void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 17661df1..762243e 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -449,6 +449,9 @@
*/
int rssi_min_thold, rssi_max_thold;
int last_ave_beacon_signal;
+
+ struct ieee80211_ht_cap ht_capa; /* configured ht-cap over-rides */
+ struct ieee80211_ht_cap ht_capa_mask; /* Valid parts of ht_capa */
};
struct ieee80211_if_ibss {
@@ -1252,7 +1255,11 @@
struct net_device *dev);
/* HT */
-void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
+bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata);
+void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_sta_ht_cap *ht_cap);
+void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_supported_band *sband,
struct ieee80211_ht_cap *ht_cap_ie,
struct ieee80211_sta_ht_cap *ht_cap);
void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
@@ -1407,7 +1414,7 @@
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
const u8 *ids, int n_ids, size_t offset);
size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset);
-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);
u8 *ieee80211_ie_build_ht_info(u8 *pos,
struct ieee80211_sta_ht_cap *ht_cap,
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index f0106d3..dddedfa 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -558,6 +558,19 @@
},
};
+static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
+ .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
+ IEEE80211_HT_AMPDU_PARM_DENSITY,
+
+ .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
+ IEEE80211_HT_CAP_MAX_AMSDU |
+ IEEE80211_HT_CAP_SGI_40),
+ .mcs = {
+ .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, },
+ },
+};
+
struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
const struct ieee80211_ops *ops)
{
@@ -631,6 +644,7 @@
local->user_power_level = -1;
local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
+ wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
INIT_LIST_HEAD(&local->interfaces);
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index b3a125f..ee82d2f 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -366,7 +366,7 @@
return -ENOMEM;
pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
- ieee80211_ie_build_ht_cap(pos, sband, sband->ht_cap.cap);
+ ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
return 0;
}
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 0140e88..7314372b 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -101,7 +101,8 @@
set_sta_flag(sta, WLAN_STA_WME);
sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
if (elems->ht_cap_elem)
- ieee80211_ht_cap_ie_to_sta_ht_cap(sband, elems->ht_cap_elem,
+ ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
+ elems->ht_cap_elem,
&sta->sta.ht_cap);
rate_control_rate_init(sta);
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 0f58122..8925138 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -207,6 +207,7 @@
channel_type = NL80211_CHAN_HT20;
if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
+ !ieee80111_cfg_override_disables_ht40(sdata) &&
(sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
(hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
@@ -1118,6 +1119,8 @@
/* on the next assoc, re-program HT parameters */
sdata->ht_opmode_valid = false;
+ memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
+ memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
local->power_constr_level = 0;
@@ -1611,7 +1614,7 @@
sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
- ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
+ ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
elems.ht_cap_elem, &sta->sta.ht_cap);
ap_ht_cap_flags = sta->sta.ht_cap.cap;
@@ -1980,7 +1983,7 @@
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
- ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
+ ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
elems.ht_cap_elem, &sta->sta.ht_cap);
ap_ht_cap_flags = sta->sta.ht_cap.cap;
@@ -2640,6 +2643,13 @@
ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
+ if (req->flags & ASSOC_REQ_DISABLE_HT)
+ ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
+
+ memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
+ memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
+ sizeof(ifmgd->ht_capa_mask));
+
if (req->ie && req->ie_len) {
memcpy(wk->ie, req->ie, req->ie_len);
wk->ie_len = req->ie_len;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index e2cb00d..1118393 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -979,7 +979,8 @@
}
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 @@
}
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 @@
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);
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 */