mac80211: fix unnecessary frame drops in mesh fwding

The ieee80211_queue_stopped() expects hw queue
number but it was given raw WMM AC number instead.

This could cause frame drops and problems with
traffic in some cases - most notably if driver
doesn't map AC numbers to queue numbers 1:1 and
uses ieee80211_stop_queues() and
ieee80211_wake_queue() only without ever calling
ieee80211_wake_queues().

On ath10k it was possible to hit this problem in
the following case:

  1. wlan0 uses queue 0
     (ath10k maps queues per vif)
  2. offchannel uses queue 15
  3. queues 1-14 are unused
  4. ieee80211_stop_queues()
  5. ieee80211_wake_queue(q=0)
  6. ieee80211_wake_queue(q=15)
     (other queues are not woken up because both
      driver and mac80211 know other queues are
      unused)
  7. ieee80211_rx_h_mesh_fwding()
  8. ieee80211_select_queue_80211() returns 2
  9. ieee80211_queue_stopped(q=2) returns true
 10. frame is dropped (oops!)

Fixes: d3c1597b8d1b ("mac80211: fix forwarded mesh frame queue mapping")
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index ae993edfdecf6893dab132a6226242e26b6c80df..664e8861edbef5172ae9bfe6a520e64c9f54eae6 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2235,7 +2235,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
        struct ieee80211_local *local = rx->local;
        struct ieee80211_sub_if_data *sdata = rx->sdata;
        struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
-       u16 q, hdrlen;
+       u16 ac, q, hdrlen;
 
        hdr = (struct ieee80211_hdr *) skb->data;
        hdrlen = ieee80211_hdrlen(hdr->frame_control);
@@ -2304,7 +2304,8 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
            ether_addr_equal(sdata->vif.addr, hdr->addr3))
                return RX_CONTINUE;
 
-       q = ieee80211_select_queue_80211(sdata, skb, hdr);
+       ac = ieee80211_select_queue_80211(sdata, skb, hdr);
+       q = sdata->vif.hw_queue[ac];
        if (ieee80211_queue_stopped(&local->hw, q)) {
                IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
                return RX_DROP_MONITOR;