mac80211: Comment the order of HT RX reorder handler vs. RX handlers

We are currently processing block ack reordering as a separate task
before all other RX handlers. In theory, this is wrong since this step
should be done only after duplicate removal (see Figure 6-1 in IEEE
802.11n). However, moving this needs some work and the current
situation is not too bad. Add a comment here so that this small detail
does not get forgotten and who knows, maybe someone has some extra
time to take a look at cleaning this up.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 24d4170..d052f40 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2551,6 +2551,18 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
                return;
        }
 
+       /*
+        * In theory, the block ack reordering should happen after duplicate
+        * removal (ieee80211_rx_h_check(), which is an RX handler). As such,
+        * the call to ieee80211_rx_reorder_ampdu() should really be moved to
+        * happen as a new RX handler between ieee80211_rx_h_check and
+        * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for
+        * the time being, the call can be here since RX reorder buf processing
+        * will implicitly skip duplicates. We could, in theory at least,
+        * process frames that ieee80211_rx_h_passive_scan would drop (e.g.,
+        * frames from other than operational channel), but that should not
+        * happen in normal networks.
+        */
        if (!ieee80211_rx_reorder_ampdu(local, skb, status))
                __ieee80211_rx_handle_packet(hw, skb, status, rate);