mac80211: enable TDLS peer buffer STA feature

Allow drivers to set the buffer station extended capability
for TDLS links, with a new hardware flag indicating this.

Signed-off-by: Yingying Tang <yintang@qti.qualcomm.com>
[change commit log/documentation wording]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 9 insertions, 1 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index eec143cca1c0..2ee4af25256d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2056,6 +2056,9 @@ struct ieee80211_txq {
  *      The stack will not do fragmentation.
  *      The callback for @set_frag_threshold should be set as well.
  *
+ * @IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA: Hardware supports buffer STA on
+ *      TDLS links.
+ *
  * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
  */
 enum ieee80211_hw_flags {
@@ -2098,6 +2101,7 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_TX_FRAG_LIST,
         IEEE80211_HW_REPORTS_LOW_ACK,
         IEEE80211_HW_SUPPORTS_TX_FRAG,
+        IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA,
 
         /* keep last, obviously */
         NUM_IEEE80211_HW_FLAGS
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 5fae001f286c..1f466d12a6bc 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -211,6 +211,7 @@ static const char *hw_flag_names[] = {
         FLAG(TX_FRAG_LIST),
         FLAG(REPORTS_LOW_ACK),
         FLAG(SUPPORTS_TX_FRAG),
+        FLAG(SUPPORTS_TDLS_BUFFER_STA),
 #undef FLAG
 };
 
diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index 96d4fb998e33..5cd5e6e5834e 100644
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -47,6 +47,8 @@ static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
                            NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
         bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) &&
                           !ifmgd->tdls_wider_bw_prohibited;
+        bool buffer_sta = ieee80211_hw_check(&local->hw,
+                                             SUPPORTS_TDLS_BUFFER_STA);
         struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata);
         bool vht = sband && sband->vht_cap.vht_supported;
         u8 *pos = skb_put(skb, 10);
@@ -56,7 +58,8 @@ static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata,
         *pos++ = 0x0;
         *pos++ = 0x0;
         *pos++ = 0x0;
-        *pos++ = chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0;
+        *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) |
+                 (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0);
         *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
         *pos++ = 0;
         *pos++ = 0;