package/kernel/mac80211/patches/314-mac80211-mesh-avoid-pointless-station-lookup.patch

   1 From: Johannes Berg <johannes.berg@intel.com>
   2 Date: Fri, 20 Mar 2015 16:24:23 +0100
   3 Subject: [PATCH] mac80211: mesh: avoid pointless station lookup
   4
   5 In ieee80211_build_hdr(), the station is looked up to build the
   6 header correctly (QoS field) and to check for authorization. For
   7 mesh, authorization isn't checked here, and QoS capability is
   8 mandatory, so the station lookup can be avoided.
   9
  10 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  11 ---
  12
  13 --- a/net/mac80211/tx.c
  14 +++ b/net/mac80211/tx.c
  15 @@ -2131,12 +2131,14 @@ static struct sk_buff *ieee80211_build_h
  16         }
  17
  18         /*
  19 -        * There's no need to try to look up the destination
  20 -        * if it is a multicast address (which can only happen
  21 -        * in AP mode)
  22 +        * There's no need to try to look up the destination station
  23 +        * if it is a multicast address. In mesh, there's no need to
  24 +        * look up the station at all as it always must be QoS capable
  25 +        * and mesh mode checks authorization later.
  26          */
  27         multicast = is_multicast_ether_addr(hdr.addr1);
  28 -       if (!multicast && !have_station) {
  29 +       if (!multicast && !have_station &&
  30 +           !ieee80211_vif_is_mesh(&sdata->vif)) {
  31                 sta = sta_info_get(sdata, hdr.addr1);
  32                 if (sta) {
  33                         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);