cfg80211/mac80211: improve ad-hoc multicast rate handling

- store the multicast rate as an index instead of the rate value
  (reduces cpu overhead in a hotpath)
- validate the rate values (must match a bitrate in at least one sband)

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

2 files changed, 4 insertions, 4 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 91f099556ac1..dd4c43f512e2 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -923,7 +923,7 @@ struct cfg80211_disassoc_request {
  * @privacy: this is a protected network, keys will be configured
  *      after joining
  * @basic_rates: bitmap of basic rates to use when creating the IBSS
- * @mcast_rate: multicast tx rate (in 100 kbps)
+ * @mcast_rate: per-band multicast rate index + 1 (0: disabled)
  */
 struct cfg80211_ibss_params {
         u8 *ssid;
@@ -935,7 +935,7 @@ struct cfg80211_ibss_params {
         u32 basic_rates;
         bool channel_fixed;
         bool privacy;
-        int mcast_rate;
+        int mcast_rate[IEEE80211_NUM_BANDS];
 };
 
 /**
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 5b0fff2178bb..08e97e5d03fd 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -219,7 +219,7 @@ enum ieee80211_bss_change {
  * @basic_rates: bitmap of basic rates, each bit stands for an
  *      index into the rate table configured by the driver in
  *      the current band.
- * @mcast_rate: multicast rate for AP and Ad-Hoc (in 100 kbps)
+ * @mcast_rate: per-band multicast rate index + 1 (0: disabled)
  * @bssid: The BSSID for this BSS
  * @enable_beacon: whether beaconing should be enabled or not
  * @channel_type: Channel type for this BSS -- the hardware might be
@@ -259,7 +259,7 @@ struct ieee80211_bss_conf {
         u16 assoc_capability;
         u64 timestamp;
         u32 basic_rates;
-        u32 mcast_rate;
+        int mcast_rate[IEEE80211_NUM_BANDS];
         u16 ht_operation_mode;
         s32 cqm_rssi_thold;
         u32 cqm_rssi_hyst;