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, 14 insertions, 0 deletions

diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 16983825f8e8..79019f94f621 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -233,6 +233,20 @@ static inline void drv_get_tkip_seq(struct ieee80211_local *local,
         trace_drv_get_tkip_seq(local, hw_key_idx, iv32, iv16);
 }
 
+static inline int drv_set_frag_threshold(struct ieee80211_local *local,
+                                        u32 value)
+{
+        int ret = 0;
+
+        might_sleep();
+
+        trace_drv_set_frag_threshold(local, value);
+        if (local->ops->set_frag_threshold)
+                ret = local->ops->set_frag_threshold(&local->hw, value);
+        trace_drv_return_int(local, ret);
+        return ret;
+}
+
 static inline int drv_set_rts_threshold(struct ieee80211_local *local,
                                         u32 value)
 {