nimble/ll: Compile out not enabled GAP roles

This gives some FLASH and RAM savings for applications that use only
subset of GAP roles. LL features are also tuned depending on selected
GAP roles.

Examples of FLASH and RAM usage:
BLE_ROLE_CENTRAL: 1
BLE_ROLE_PERIPHERAL: 1
BLE_ROLE_BROADCASTER: 1
BLE_ROLE_OBSERVER: 1
56122   19661 @apache-mynewt-nimble_nimble_controller.a

BLE_ROLE_CENTRAL: 0
BLE_ROLE_PERIPHERAL: 1
BLE_ROLE_BROADCASTER: 1
BLE_ROLE_OBSERVER: 1
51344   19589 @apache-mynewt-nimble_nimble_controller.a

BLE_ROLE_CENTRAL: 0
BLE_ROLE_PERIPHERAL: 1
BLE_ROLE_BROADCASTER: 1
BLE_ROLE_OBSERVER: 0
35694   15232 @apache-mynewt-nimble_nimble_controller.a

BLE_ROLE_CENTRAL: 1
BLE_ROLE_PERIPHERAL: 0
BLE_ROLE_BROADCASTER: 1
BLE_ROLE_OBSERVER: 1
53338   19593 @apache-mynewt-nimble_nimble_controller.a

BLE_ROLE_CENTRAL: 1
BLE_ROLE_PERIPHERAL: 0
BLE_ROLE_BROADCASTER: 0
BLE_ROLE_OBSERVER: 1
42040   12925 @apache-mynewt-nimble_nimble_controller.a

BLE_ROLE_CENTRAL: 0
BLE_ROLE_PERIPHERAL: 0
BLE_ROLE_BROADCASTER: 1
BLE_ROLE_OBSERVER: 1
34800   12525 @apache-mynewt-nimble_nimble_controller.a

BLE_ROLE_CENTRAL: 0
BLE_ROLE_PERIPHERAL: 0
BLE_ROLE_BROADCASTER: 1
BLE_ROLE_OBSERVER: 0
19126    8168 @apache-mynewt-nimble_nimble_controller.a

Author: sjanc

nimble/controller/include/controller/ble_ll.h

@@ -108,11 +108,13 @@ struct ble_ll_obj
     /* Current Link Layer state */
     uint8_t ll_state;
 
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL) || MYNEWT_VAL(BLE_LL_ROLE_PERIPHERAL)
     /* Number of ACL data packets supported */
     uint8_t ll_num_acl_pkts;
 
     /* ACL data packet size */
     uint16_t ll_acl_pkt_size;
+#endif
 
     /* Preferred PHY's */
     uint8_t ll_pref_tx_phys;
@@ -129,14 +131,18 @@ struct ble_ll_obj
     struct ble_ll_pkt_q ll_rx_pkt_q;
 
     /* Packet transmit queue */
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL) || MYNEWT_VAL(BLE_LL_ROLE_PERIPHERAL)
     struct ble_npl_event ll_tx_pkt_ev;
+#endif
     struct ble_ll_pkt_q ll_tx_pkt_q;
 
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL) || MYNEWT_VAL(BLE_LL_ROLE_PERIPHERAL)
     /* Data buffer overflow event */
     struct ble_npl_event ll_dbuf_overflow_ev;
 
     /* Number of completed packets event */
     struct ble_npl_event ll_comp_pkt_ev;
+#endif
 
     /* HW error callout */
     struct ble_npl_callout ll_hw_err_timer;
@@ -214,12 +220,24 @@ extern STATS_SECT_DECL(ble_ll_stats) ble_ll_stats;
 
 /* States */
 #define BLE_LL_STATE_STANDBY        (0)
+#if MYNEWT_VAL(BLE_LL_ROLE_BROADCASTER)
 #define BLE_LL_STATE_ADV            (1)
+#endif
+#if MYNEWT_VAL(BLE_LL_ROLE_OBSERVER)
 #define BLE_LL_STATE_SCANNING       (2)
+#endif
+#if MYNEWT_VAL(BLE_LL_ROLE_PERIPHERAL) || MYNEWT_VAL(BLE_LL_ROLE_CENTRAL)
 #define BLE_LL_STATE_CONNECTION     (4)
+#endif
+#if MYNEWT_VAL(BLE_LL_DTM)
 #define BLE_LL_STATE_DTM            (5)
+#endif
+#if MYNEWT_VAL(BLE_LL_ROLE_OBSERVER) && MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PERIODIC_ADV)
 #define BLE_LL_STATE_SYNC           (6)
+#endif
+#if MYNEWT_VAL(BLE_LL_ROLE_OBSERVER) && MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_EXT_ADV)
 #define BLE_LL_STATE_SCAN_AUX       (7)
+#endif
 
 /* LL Features */
 #define BLE_LL_FEAT_LE_ENCRYPTION    (0x0000000001)

nimble/controller/include/controller/ble_ll_conn.h

@@ -34,8 +34,13 @@ extern "C" {
 
 /* Roles */
 #define BLE_LL_CONN_ROLE_NONE           (0)
+
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL)
 #define BLE_LL_CONN_ROLE_MASTER         (1)
+#endif
+#if MYNEWT_VAL(BLE_LL_ROLE_PERIPHERAL)
 #define BLE_LL_CONN_ROLE_SLAVE          (2)
+#endif
 
 /* Connection states */
 #define BLE_LL_CONN_STATE_IDLE          (0)
@@ -370,8 +375,17 @@ struct ble_ll_conn_sm
 #define CONN_F_AUX_CONN_REQ(csm)  ((csm)->csmflags.cfbit.aux_conn_req)
 
 /* Role */
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL)
 #define CONN_IS_MASTER(csm)         (csm->conn_role == BLE_LL_CONN_ROLE_MASTER)
+#else
+#define CONN_IS_MASTER(csm)         (false)
+#endif
+
+#if MYNEWT_VAL(BLE_LL_ROLE_PERIPHERAL)
 #define CONN_IS_SLAVE(csm)          (csm->conn_role == BLE_LL_CONN_ROLE_SLAVE)
+#else
+#define CONN_IS_SLAVE(csm)          (false)
+#endif
 
 /*
  * Given a handle, returns an active connection state machine (or NULL if the

nimble/controller/include/controller/ble_ll_scan.h

@@ -152,14 +152,18 @@ struct ble_ll_scan_sm
     struct ble_ll_scan_phy *scanp_next;
     struct ble_ll_scan_phy scan_phys[BLE_LL_SCAN_PHY_NUMBER];
 
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL)
     /* Connection sm for initiator scan */
     struct ble_ll_conn_sm *connsm;
+#endif
 };
 
 /* Scan types */
 #define BLE_SCAN_TYPE_PASSIVE   (BLE_HCI_SCAN_TYPE_PASSIVE)
 #define BLE_SCAN_TYPE_ACTIVE    (BLE_HCI_SCAN_TYPE_ACTIVE)
+#if MYNEWT_VAL(BLE_LL_ROLE_CENTRAL)
 #define BLE_SCAN_TYPE_INITIATE  (2)
+#endif
 
 /*---- HCI ----*/
 /* Set scanning parameters */
@@ -219,7 +223,11 @@ uint8_t *ble_ll_scan_get_local_rpa(void);
 void ble_ll_scan_sm_stop(int chk_disable);
 
 /* Resume scanning */
+#if MYNEWT_VAL(BLE_LL_ROLE_OBSERVER)
 void ble_ll_scan_chk_resume(void);
+#else
+static inline void ble_ll_scan_chk_resume(void) { };
+#endif
 
 /* Called when wait for response timer expires in scanning mode */
 void ble_ll_scan_wfr_timer_exp(void);