mac80211: track AP's beacon rate and give it to the driver

Track the AP's beacon rate in the scan BSS data and in the
interface configuration to let the drivers know which rate
the AP is using. This information may be used by drivers,
in our case to let the firmware optimise beacon RX.

Signed-off-by: Alexander Bondar <alexander.bondar@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index ad9bb9e10cbb..87f2d4df31f8 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1779,8 +1779,10 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                  * probably just won't work at all.
                  */
                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
+                bss_conf->beacon_rate = bss->beacon_rate;
                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
         } else {
+                bss_conf->beacon_rate = NULL;
                 bss_conf->dtim_period = 0;
         }
 
@@ -1903,6 +1905,8 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
         del_timer_sync(&sdata->u.mgd.chswitch_timer);
 
         sdata->vif.bss_conf.dtim_period = 0;
+        sdata->vif.bss_conf.beacon_rate = NULL;
+
         ifmgd->have_beacon = false;
 
         ifmgd->flags = 0;
@@ -2754,8 +2758,10 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 
         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
                                         channel);
-        if (bss)
+        if (bss) {
                 ieee80211_rx_bss_put(local, bss);
+                sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
+        }
 
         if (!sdata->u.mgd.associated ||
             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))