mac80211: debugfs: add file to disallow TDLS wider-bw

Sometimes we are interested in testing TDLS performance in a specific
width setting. Add the ability to disable the wider-band feature, thereby
allowing the TDLS channel width to be controlled by the BSS width.

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>

4 files changed, 34 insertions, 1 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 685ec13ed7c2..1ca972e5418b 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1156,6 +1156,7 @@ static int sta_apply_parameters(struct ieee80211_local *local,
                 set_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH);
 
         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
+            !sdata->u.mgd.tdls_wider_bw_prohibited &&
             ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
             params->ext_capab_len >= 8 &&
             params->ext_capab[7] & WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED)
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 1021e87c051f..f1580e96c8fc 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -455,6 +455,34 @@ static ssize_t ieee80211_if_parse_uapsd_max_sp_len(
 }
 IEEE80211_IF_FILE_RW(uapsd_max_sp_len);
 
+static ssize_t ieee80211_if_fmt_tdls_wider_bw(
+        const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
+{
+        const struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+        bool tdls_wider_bw;
+
+        tdls_wider_bw = ieee80211_hw_check(&sdata->local->hw, TDLS_WIDER_BW) &&
+                        !ifmgd->tdls_wider_bw_prohibited;
+
+        return snprintf(buf, buflen, "%d\n", tdls_wider_bw);
+}
+
+static ssize_t ieee80211_if_parse_tdls_wider_bw(
+        struct ieee80211_sub_if_data *sdata, const char *buf, int buflen)
+{
+        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+        u8 val;
+        int ret;
+
+        ret = kstrtou8(buf, 0, &val);
+        if (ret)
+                return ret;
+
+        ifmgd->tdls_wider_bw_prohibited = !val;
+        return buflen;
+}
+IEEE80211_IF_FILE_RW(tdls_wider_bw);
+
 /* AP attributes */
 IEEE80211_IF_FILE(num_mcast_sta, u.ap.num_mcast_sta, ATOMIC);
 IEEE80211_IF_FILE(num_sta_ps, u.ap.ps.num_sta_ps, ATOMIC);
@@ -614,6 +642,7 @@ static void add_sta_files(struct ieee80211_sub_if_data *sdata)
         DEBUGFS_ADD_MODE(beacon_loss, 0200);
         DEBUGFS_ADD_MODE(uapsd_queues, 0600);
         DEBUGFS_ADD_MODE(uapsd_max_sp_len, 0600);
+        DEBUGFS_ADD_MODE(tdls_wider_bw, 0600);
 }
 
 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 6e52659f923f..65f4faa94e4e 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -535,6 +535,7 @@ struct ieee80211_if_managed {
         struct sk_buff *teardown_skb; /* A copy to send through the AP */
         spinlock_t teardown_lock; /* To lock changing teardown_skb */
         bool tdls_chan_switch_prohibited;
+        bool tdls_wider_bw_prohibited;
 
         /* WMM-AC TSPEC support */
         struct ieee80211_sta_tx_tspec tx_tspec[IEEE80211_NUM_ACS];
diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index aee701a5649e..1bacea793c23 100644
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -41,9 +41,11 @@ static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
                                          struct sk_buff *skb)
 {
         struct ieee80211_local *local = sdata->local;
+        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
         bool chan_switch = local->hw.wiphy->features &
                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
-        bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW);
+        bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
+                          !ifmgd->tdls_wider_bw_prohibited;
         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;