cfg80211: add extensible feature flag attribute

With the wiphy::features flag being used up this patch adds a
new field wiphy::ext_features. Considering extensibility this
new field is declared as a byte array. This extensible flag is
exposed to user-space by NL80211_ATTR_EXT_FEATURES.

Cc: Avinash Patil <patila@marvell.com>
Signed-off-by: Gautam (Gautam Kumar) Shukla <gautams@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 54f391141351..f95d35483086 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1713,6 +1713,13 @@ enum nl80211_commands {
  *      obtained from it is coming from the device's wiphy and not the global
  *      cfg80211 regdomain.
  *
+ * @NL80211_ATTR_EXT_FEATURES: extended feature flags contained in a byte
+ *      array. The feature flags are identified by their bit index (see &enum
+ *      nl80211_ext_feature_index). The bit index is ordered starting at the
+ *      least-significant bit of the first byte in the array, ie. bit index 0
+ *      is located at bit 0 of byte 0. bit index 25 would be located at bit 1
+ *      of byte 3 (u8 array).
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2072,6 +2079,8 @@ enum nl80211_attrs {
 
         NL80211_ATTR_WIPHY_SELF_MANAGED_REG,
 
+        NL80211_ATTR_EXT_FEATURES,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
@@ -4224,6 +4233,19 @@ enum nl80211_feature_flags {
 };
 
 /**
+ * enum nl80211_ext_feature_index - bit index of extended features.
+ *
+ * @NUM_NL80211_EXT_FEATURES: number of extended features.
+ * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
+ */
+enum nl80211_ext_feature_index {
+
+        /* add new features before the definition below */
+        NUM_NL80211_EXT_FEATURES,
+        MAX_NL80211_EXT_FEATURES = NUM_NL80211_EXT_FEATURES - 1
+};
+
+/**
  * enum nl80211_probe_resp_offload_support_attr - optional supported
  *      protocols for probe-response offloading by the driver/FW.
  *      To be used with the %NL80211_ATTR_PROBE_RESP_OFFLOAD attribute.