Commit b98fb44f authored by Arik Nemtsov's avatar Arik Nemtsov Committed by Johannes Berg
Browse files

mac80211: define TDLS wider BW support bits



Allow a device to specify support for the TDLS wider-bandwidth feature.
Indicate this support during TDLS setup in the ext-capab IE and set an
appropriate station flag when our TDLS peer supports it.
This feature gives TDLS peers the ability to use a wider channel than
the base width of the BSS. For instance VHT capable TDLS peers connected
on a 20MHz channel can extend the channel to 80MHz, if regulatory
considerations allow it.

Do not cap the bandwidth of such stations by the current BSS channel width
in mac80211.

Signed-off-by: default avatarArik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 7584f88f
......@@ -1887,6 +1887,9 @@ struct ieee80211_txq {
* @IEEE80211_HW_SINGLE_SCAN_ON_ALL_BANDS: The HW supports scanning on all bands
* in one command, mac80211 doesn't have to run separate scans per band.
*
* @IEEE80211_HW_TDLS_WIDER_BW: The device/driver supports wider bandwidth
* than then BSS bandwidth for a TDLS link on the base channel.
*
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
......@@ -1919,6 +1922,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_CHANCTX_STA_CSA,
IEEE80211_HW_SUPPORTS_CLONED_SKBS,
IEEE80211_HW_SINGLE_SCAN_ON_ALL_BANDS,
IEEE80211_HW_TDLS_WIDER_BW,
/* keep last, obviously */
NUM_IEEE80211_HW_FLAGS
......
......@@ -1155,6 +1155,12 @@ static int sta_apply_parameters(struct ieee80211_local *local,
params->ext_capab[3] & WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH)
set_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH);
if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
params->ext_capab_len >= 8 &&
params->ext_capab[7] & WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED)
set_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW);
if (params->sta_modify_mask & STATION_PARAM_APPLY_UAPSD) {
sta->sta.uapsd_queues = params->uapsd_queues;
sta->sta.max_sp = params->max_sp;
......
......@@ -122,6 +122,7 @@ static const char *hw_flag_names[NUM_IEEE80211_HW_FLAGS + 1] = {
FLAG(CHANCTX_STA_CSA),
FLAG(SUPPORTS_CLONED_SKBS),
FLAG(SINGLE_SCAN_ON_ALL_BANDS),
FLAG(TDLS_WIDER_BW),
/* keep last for the build bug below */
(void *)0x1
......
......@@ -53,6 +53,8 @@
* @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
* @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
* TDLS peer
* @WLAN_STA_TDLS_WIDER_BW: This TDLS peer supports working on a wider bw on
* the BSS base channel.
* @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
* keeping station in power-save mode, reply when the driver
* unblocks the station.
......@@ -84,6 +86,7 @@ enum ieee80211_sta_info_flags {
WLAN_STA_TDLS_INITIATOR,
WLAN_STA_TDLS_CHAN_SWITCH,
WLAN_STA_TDLS_OFF_CHANNEL,
WLAN_STA_TDLS_WIDER_BW,
WLAN_STA_UAPSD,
WLAN_STA_SP,
WLAN_STA_4ADDR_EVENT,
......
......@@ -35,20 +35,28 @@ void ieee80211_tdls_peer_del_work(struct work_struct *wk)
mutex_unlock(&local->mtx);
}
static void ieee80211_tdls_add_ext_capab(struct ieee80211_local *local,
static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
u8 *pos = (void *)skb_put(skb, 7);
struct ieee80211_local *local = sdata->local;
bool chan_switch = local->hw.wiphy->features &
NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW);
enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
bool vht = sband && sband->vht_cap.vht_supported;
u8 *pos = (void *)skb_put(skb, 10);
*pos++ = WLAN_EID_EXT_CAPABILITY;
*pos++ = 5; /* len */
*pos++ = 8; /* len */
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = 0x0;
*pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
*pos++ = 0;
*pos++ = 0;
*pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0;
}
static u8
......@@ -320,7 +328,7 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
offset = noffset;
}
ieee80211_tdls_add_ext_capab(local, skb);
ieee80211_tdls_add_ext_capab(sdata, skb);
/* add the QoS element if we support it */
if (local->hw.queues >= IEEE80211_NUM_ACS &&
......@@ -784,7 +792,7 @@ ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
max(sizeof(struct ieee80211_mgmt),
sizeof(struct ieee80211_tdls_data)) +
50 + /* supported rates */
7 + /* ext capab */
10 + /* ext capab */
26 + /* max(WMM-info, WMM-param) */
2 + max(sizeof(struct ieee80211_ht_cap),
sizeof(struct ieee80211_ht_operation)) +
......
......@@ -308,11 +308,15 @@ enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
enum ieee80211_sta_rx_bandwidth bw;
enum nl80211_chan_width bss_width = sdata->vif.bss_conf.chandef.width;
bw = ieee80211_chan_width_to_rx_bw(sdata->vif.bss_conf.chandef.width);
bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
bw = ieee80211_sta_cap_rx_bw(sta);
bw = min(bw, sta->cur_max_bandwidth);
/* do not cap the BW of TDLS WIDER_BW peers by the bss */
if (!test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
return bw;
}
......
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