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>

2 files changed, 61 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index bd672ea08c9a..f38645fb83b9 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3016,6 +3016,8 @@ struct wiphy_vendor_command {
  * @regulatory_flags: wiphy regulatory flags, see
  *      &enum ieee80211_regulatory_flags
  * @features: features advertised to nl80211, see &enum nl80211_feature_flags.
+ * @ext_features: extended features advertised to nl80211, see
+ *      &enum nl80211_ext_feature_index.
  * @bss_priv_size: each BSS struct has private data allocated with it,
  *      this variable determines its size
  * @max_scan_ssids: maximum number of SSIDs the device can scan for in
@@ -3125,6 +3127,7 @@ struct wiphy {
         u16 max_acl_mac_addrs;
 
         u32 flags, regulatory_flags, features;
+        u8 ext_features[DIV_ROUND_UP(NUM_NL80211_EXT_FEATURES, 8)];
 
         u32 ap_sme_capa;
 
@@ -5052,6 +5055,42 @@ void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
  */
 void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy);
 
+/**
+ * wiphy_ext_feature_set - set the extended feature flag
+ *
+ * @wiphy: the wiphy to modify.
+ * @ftidx: extended feature bit index.
+ *
+ * The extended features are flagged in multiple bytes (see
+ * &struct wiphy.@ext_features)
+ */
+static inline void wiphy_ext_feature_set(struct wiphy *wiphy,
+                                         enum nl80211_ext_feature_index ftidx)
+{
+        u8 *ft_byte;
+
+        ft_byte = &wiphy->ext_features[ftidx / 8];
+        *ft_byte |= BIT(ftidx % 8);
+}
+
+/**
+ * wiphy_ext_feature_isset - check the extended feature flag
+ *
+ * @wiphy: the wiphy to modify.
+ * @ftidx: extended feature bit index.
+ *
+ * The extended features are flagged in multiple bytes (see
+ * &struct wiphy.@ext_features)
+ */
+static inline bool
+wiphy_ext_feature_isset(struct wiphy *wiphy,
+                        enum nl80211_ext_feature_index ftidx)
+{
+        u8 ft_byte;
+
+        ft_byte = wiphy->ext_features[ftidx / 8];
+        return (ft_byte & BIT(ftidx % 8)) != 0;
+}
 
 /* ethtool helper */
 void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info);
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.