qcacmn: Add utility functions to set/get flow tag from skb cb

Tags are programmed using wlanconfig commands. Rx IPv4/v6
TCP/UDP packets matching a 5-tuple are tagged using HawkeyeV2 hardware.
Tags are populated in the skb->cb in the REO/exception/monitor data
path and sent to upper stack

CRs-Fixed: 2475913
Change-Id: I534a633b99a8b1c4c9aab71fbf5857710d7977a1

qdf/linux/src/i_qdf_nbuf.h

@@ -101,10 +101,8 @@ typedef union {
  * @rx.dev.priv_cb_w.fctx: ctx to handle special pkts defined by ftype
  * @rx.dev.priv_cb_w.msdu_len: length of RX packet
  * @rx.dev.priv_cb_w.peer_id: peer_id for RX packet
- * @rx.dev.priv_cb_w.protocol_tag:	protocol tag set by application for
- *				received packet type
- * @rx.dev.priv_cb_w.reserved1: reserved for flow tag set by application
- *				for 5 tuples received
+ * @rx.dev.priv_cb_w.protocol_tag: protocol tag set by app for rcvd packet type
+ * @rx.dev.priv_cb_w.flow_tag: flow tag set by application for 5 tuples rcvd
  *
  * @rx.dev.priv_cb_m.tcp_seq_num: TCP sequence number
  * @rx.dev.priv_cb_m.tcp_ack_num: TCP ACK number
@@ -212,7 +210,7 @@ struct qdf_nbuf_cb {
 					uint16_t msdu_len;
 					uint16_t peer_id;
 					uint16_t protocol_tag;
-					uint16_t reserved1;
+					uint16_t flow_tag;
 				} priv_cb_w;
 				struct {
 					/* ipa_owned bit is common between rx

qdf/linux/src/i_qdf_nbuf_w.h

@@ -82,6 +82,16 @@
 #define __qdf_nbuf_get_rx_protocol_tag(skb) \
 		(QDF_NBUF_CB_RX_PROTOCOL_TAG((skb)))
 
+#define QDF_NBUF_CB_RX_FLOW_TAG(skb) \
+		(((struct qdf_nbuf_cb *) \
+		((skb)->cb))->u.rx.dev.priv_cb_w.flow_tag)
+
+#define __qdf_nbuf_set_rx_flow_tag(skb, val) \
+		((QDF_NBUF_CB_RX_FLOW_TAG((skb))) = val)
+
+#define __qdf_nbuf_get_rx_flow_tag(skb) \
+		(QDF_NBUF_CB_RX_FLOW_TAG((skb)))
+
 /**
  * qdf_nbuf_cb_update_peer_local_id() - update peer local id in skb cb
  * @skb: skb pointer whose cb is updated with peer local id information