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: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 4d3d268..8f61a23 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -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

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b145942..a32575b 100644 (file)
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -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;

diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 2c79d77..ced6bf3 100644 (file)
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -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

diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 9e56892..b9c1aaa 100644 (file)
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -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,

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index ad31b2d..fec1b33 100644 (file)
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -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)) +

diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
index 80694d5..f05808d 100644 (file)
--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -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;
 }