ath9k_htc: claim support for IBSS RSN

Skip group keys configuration in hardware in order to make IBSS RSN work.
Keys will be managed using software.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_init.c b/drivers/net/wireless/ath/ath9k/htc_drv_init.c
index 9be10a2da1c2..fc7519c93390 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c
@@ -741,6 +741,8 @@ static void ath9k_set_hw_capab(struct ath9k_htc_priv *priv,
 
         hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 
+        hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
+
         hw->queues = 4;
         hw->channel_change_time = 5000;
         hw->max_listen_interval = 10;
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index ef4c60661290..06101b6bdeac 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -1409,6 +1409,21 @@ static int ath9k_htc_set_key(struct ieee80211_hw *hw,
         if (htc_modparam_nohwcrypt)
                 return -ENOSPC;
 
+        if ((vif->type == NL80211_IFTYPE_ADHOC ||
+             vif->type == NL80211_IFTYPE_MESH_POINT) &&
+            (key->cipher == WLAN_CIPHER_SUITE_TKIP ||
+             key->cipher == WLAN_CIPHER_SUITE_CCMP) &&
+            !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
+                /*
+                 * For now, disable hw crypto for the RSN IBSS group keys. This
+                 * could be optimized in the future to use a modified key cache
+                 * design to support per-STA RX GTK, but until that gets
+                 * implemented, use of software crypto for group addressed
+                 * frames is a acceptable to allow RSN IBSS to be used.
+                 */
+                return -EOPNOTSUPP;
+        }
+
         mutex_lock(&priv->mutex);
         ath_dbg(common, CONFIG, "Set HW Key\n");
         ath9k_htc_ps_wakeup(priv);