mac80211: inform drivers about the off-channel status on channel changes

For some drivers it can be useful to know whether the channel they're
supposed to switch to is going to be used for short off-channel work or
scanning, or whether the hardware is expected to stay on it for a while
longer. This is important for various kinds of calibration work, which
takes longer to complete and should keep some persistent state, even if
the channel temporarily changes.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 20d372e..c7027ef 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -625,11 +625,14 @@ struct ieee80211_rx_status {
  *     may turn the device off as much as possible. Typically, this flag will
  *     be set when an interface is set UP but not associated or scanning, but
  *     it can also be unset in that case when monitor interfaces are active.
+ * @IEEE80211_CONF_OFFCHANNEL: The device is currently not on its main
+ *     operating channel.
  */
 enum ieee80211_conf_flags {
        IEEE80211_CONF_MONITOR          = (1<<0),
        IEEE80211_CONF_PS               = (1<<1),
        IEEE80211_CONF_IDLE             = (1<<2),
+       IEEE80211_CONF_OFFCHANNEL       = (1<<3),
 };
 
 

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 0e95c75..7cc4f91 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -107,12 +107,15 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
        if (scan_chan) {
                chan = scan_chan;
                channel_type = NL80211_CHAN_NO_HT;
+               local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
        } else if (local->tmp_channel) {
                chan = scan_chan = local->tmp_channel;
                channel_type = local->tmp_channel_type;
+               local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
        } else {
                chan = local->oper_channel;
                channel_type = local->_oper_channel_type;
+               local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
        }
 
        if (chan != local->hw.conf.channel ||