mac80211: add ieee80211_vif_change_bandwidth
For HT and VHT the current bandwidth can change,
add the function ieee80211_vif_change_bandwidth()
to take care of this. It returns a failure if the
new bandwidth isn't compatible with the existing
channel context, the caller has to handle that.
When it happens, also inform the driver that the
bandwidth changed for this virtual interface (no
drivers would actually care today though.)
Changing to/from HT/VHT isn't allowed though.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 78dbb37..78c0d90 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -375,6 +375,55 @@
return ret;
}
+int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
+ const struct cfg80211_chan_def *chandef,
+ u32 *changed)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx_conf *conf;
+ struct ieee80211_chanctx *ctx;
+ int ret;
+
+ if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
+ IEEE80211_CHAN_DISABLED))
+ return -EINVAL;
+
+ mutex_lock(&local->chanctx_mtx);
+ if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
+ ret = 0;
+ goto out;
+ }
+
+ if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
+ sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ if (!conf) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ctx = container_of(conf, struct ieee80211_chanctx, conf);
+ if (!cfg80211_chandef_compatible(&conf->def, chandef)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ sdata->vif.bss_conf.chandef = *chandef;
+
+ ieee80211_recalc_chanctx_chantype(local, ctx);
+
+ *changed |= BSS_CHANGED_BANDWIDTH;
+ ret = 0;
+ out:
+ mutex_unlock(&local->chanctx_mtx);
+ return ret;
+}
+
void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));