ieee80211: add trigger frame definition

Define trigger stype of control frame, and its checking function, struct
and trigger type within common_info of trigger.
Signed-off-by: Po Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220608113224.11193-2-pkshih@realtek.com

include/linux/ieee80211.h

@@ -76,6 +76,7 @@
 #define IEEE80211_STYPE_ACTION		0x00D0
 
 /* control */
+#define IEEE80211_STYPE_TRIGGER		0x0020
 #define IEEE80211_STYPE_CTL_EXT		0x0060
 #define IEEE80211_STYPE_BACK_REQ	0x0080
 #define IEEE80211_STYPE_BACK		0x0090
@@ -295,6 +296,17 @@ static inline u16 ieee80211_sn_sub(u16 sn1, u16 sn2)
 
 #define IEEE80211_HT_CTL_LEN		4
 
+/* trigger type within common_info of trigger frame */
+#define IEEE80211_TRIGGER_TYPE_MASK		0xf
+#define IEEE80211_TRIGGER_TYPE_BASIC		0x0
+#define IEEE80211_TRIGGER_TYPE_BFRP		0x1
+#define IEEE80211_TRIGGER_TYPE_MU_BAR		0x2
+#define IEEE80211_TRIGGER_TYPE_MU_RTS		0x3
+#define IEEE80211_TRIGGER_TYPE_BSRP		0x4
+#define IEEE80211_TRIGGER_TYPE_GCR_MU_BAR	0x5
+#define IEEE80211_TRIGGER_TYPE_BQRP		0x6
+#define IEEE80211_TRIGGER_TYPE_NFRP		0x7
+
 struct ieee80211_hdr {
 	__le16 frame_control;
 	__le16 duration_id;
@@ -324,6 +336,15 @@ struct ieee80211_qos_hdr {
 	__le16 qos_ctrl;
 } __packed __aligned(2);
 
+struct ieee80211_trigger {
+	__le16 frame_control;
+	__le16 duration;
+	u8 ra[ETH_ALEN];
+	u8 ta[ETH_ALEN];
+	__le64 common_info;
+	u8 variable[];
+} __packed __aligned(2);
+
 /**
  * ieee80211_has_tods - check if IEEE80211_FCTL_TODS is set
  * @fc: frame control bytes in little-endian byteorder
@@ -729,6 +750,16 @@ static inline bool ieee80211_is_qos_nullfunc(__le16 fc)
 	       cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
 }
 
+/**
+ * ieee80211_is_trigger - check if frame is trigger frame
+ * @fc: frame control field in little-endian byteorder
+ */
+static inline bool ieee80211_is_trigger(__le16 fc)
+{
+	return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
+	       cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_TRIGGER);
+}
+
 /**
  * ieee80211_is_any_nullfunc - check if frame is regular or QoS nullfunc frame
  * @fc: frame control bytes in little-endian byteorder