mac80211: support hardware TX fragmentation offload

The lower driver is notified when the fragmentation threshold changes
and upon a reconfig of the interface.

If the driver supports hardware TX fragmentation, don't fragment
packets in the stack.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9fdf982d1286..6122e8a3297e 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1652,6 +1652,11 @@ enum ieee80211_ampdu_mlme_action {
  *      and IV16) for the given key from hardware.
  *      The callback must be atomic.
  *
+ * @set_frag_threshold: Configuration of fragmentation threshold. Assign this
+ *      if the device does fragmentation by itself; if this callback is
+ *      implemented then the stack will not do fragmentation.
+ *      The callback can sleep.
+ *
  * @set_rts_threshold: Configuration of RTS threshold (if device needs it)
  *      The callback can sleep.
  *
@@ -1765,6 +1770,7 @@ struct ieee80211_ops {
                          struct ieee80211_low_level_stats *stats);
         void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
                              u32 *iv32, u16 *iv16);
+        int (*set_frag_threshold)(struct ieee80211_hw *hw, u32 value);
         int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
         int (*sta_add)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                        struct ieee80211_sta *sta);