when the rrc fails to allocate the ue cell resources, it should erase the ue from all stack layers

lib/include/srslte/interfaces/enb_interfaces.h

@@ -400,7 +400,7 @@ class rrc_interface_mac
 {
 public:
   /* Radio Link failure */
-  virtual void add_user(uint16_t rnti, const sched_interface::ue_cfg_t& init_ue_cfg) = 0;
+  virtual int  add_user(uint16_t rnti, const sched_interface::ue_cfg_t& init_ue_cfg) = 0;
   virtual void upd_user(uint16_t new_rnti, uint16_t old_rnti)                        = 0;
   virtual void set_activity_user(uint16_t rnti)                                      = 0;
   virtual bool is_paging_opportunity(uint32_t tti, uint32_t* payload_len)            = 0;

srsenb/hdr/stack/rrc/rrc.h

@@ -61,7 +61,7 @@ public:
   void tti_clock();
 
   // rrc_interface_mac
-  void     add_user(uint16_t rnti, const sched_interface::ue_cfg_t& init_ue_cfg) override;
+  int      add_user(uint16_t rnti, const sched_interface::ue_cfg_t& init_ue_cfg) override;
   void     upd_user(uint16_t new_rnti, uint16_t old_rnti) override;
   void     set_activity_user(uint16_t rnti) override;
   bool     is_paging_opportunity(uint32_t tti, uint32_t* payload_len) override;

srsenb/hdr/stack/rrc/rrc_ue.h

@@ -25,6 +25,7 @@ public:
 
   ue(rrc* outer_rrc, uint16_t rnti, const sched_interface::ue_cfg_t& ue_cfg);
   ~ue();
+  int  init();
   bool is_connected();
   bool is_idle();
 

srsenb/src/stack/mac/mac.cc

@@ -525,11 +525,15 @@ void mac::rach_detected(uint32_t tti, uint32_t enb_cc_idx, uint32_t preamble_idx
     ue_cfg.supported_cc_list[0].dl_cfg.tm      = SRSLTE_TM1;
     if (scheduler.ue_cfg(rnti, ue_cfg) != SRSLTE_SUCCESS) {
       Error("Registering new user rnti=0x%x to SCHED\n", rnti);
+      ue_rem(rnti);
       return;
     }
 
     // Register new user in RRC
-    rrc_h->add_user(rnti, ue_cfg);
+    if (rrc_h->add_user(rnti, ue_cfg) == SRSLTE_ERROR) {
+      ue_rem(rnti);
+      return;
+    }
 
     // Trigger scheduler RACH
     scheduler.dl_rach_info(enb_cc_idx, rar_info);

srsenb/src/stack/rrc/rrc.cc

@@ -144,27 +144,25 @@ uint32_t rrc::get_nof_users()
 void rrc::max_retx_attempted(uint16_t rnti) {}
 
 // This function is called from PRACH worker (can wait)
-void rrc::add_user(uint16_t rnti, const sched_interface::ue_cfg_t& sched_ue_cfg)
+int rrc::add_user(uint16_t rnti, const sched_interface::ue_cfg_t& sched_ue_cfg)
 {
   auto user_it = users.find(rnti);
   if (user_it == users.end()) {
-    bool rnti_added = true;
     if (rnti != SRSLTE_MRNTI) {
       // only non-eMBMS RNTIs are present in user map
-      auto p = users.insert(std::make_pair(rnti, std::unique_ptr<ue>{new ue(this, rnti, sched_ue_cfg)}));
+      std::unique_ptr<ue> u{new ue(this, rnti, sched_ue_cfg)};
+      if (not u->init()) {
+        rrc_log->error("Adding user rnti=0x%x - Failed to allocate user resources\n", rnti);
+        return SRSLTE_ERROR;
+      }
       if (ue_pool.capacity() <= 4) {
         task_sched.defer_task([]() { rrc::ue_pool.reserve(16); });
       }
-      rnti_added = p.second and p.first->second->is_allocated();
+      users.insert(std::make_pair(rnti, std::move(u)));
     }
-    if (rnti_added) {
     rlc->add_user(rnti);
     pdcp->add_user(rnti);
     rrc_log->info("Added new user rnti=0x%x\n", rnti);
-    } else {
-      mac->bearer_ue_rem(rnti, 0);
-      rrc_log->error("Adding user rnti=0x%x - Failed to allocate user resources\n", rnti);
-    }
   } else {
     rrc_log->error("Adding user rnti=0x%x (already exists)\n", rnti);
   }
@@ -181,6 +179,7 @@ void rrc::add_user(uint16_t rnti, const sched_interface::ue_cfg_t& sched_ue_cfg)
       teid_in = gtpu->add_bearer(SRSLTE_MRNTI, lcid, 1, 1);
     }
   }
+  return SRSLTE_SUCCESS;
 }
 
 /* Function called by MAC after the reception of a C-RNTI CE indicating that the UE still has a

srsenb/src/stack/rrc/rrc_ue.cc

@@ -39,24 +39,27 @@ rrc::ue::ue(rrc* outer_rrc, uint16_t rnti_, const sched_interface::ue_cfg_t& sch
   bearer_list(rnti_, parent->cfg),
   ue_security_cfg(parent->cfg),
   mac_ctrl(rnti, ue_cell_list, bearer_list, parent->cfg, parent->mac, *parent->cell_common_list, sched_ue_cfg)
-{
+{}
+
+rrc::ue::~ue() {}
 
+int rrc::ue::init()
+{
   // Allocate cell and PUCCH resources
-  if (ue_cell_list.add_cell(sched_ue_cfg.supported_cc_list[0].enb_cc_idx) == nullptr) {
-    return;
+  if (ue_cell_list.add_cell(mac_ctrl.get_ue_sched_cfg().supported_cc_list[0].enb_cc_idx) == nullptr) {
+    return SRSLTE_ERROR;
   }
 
   // Configure
   apply_setup_phy_common(parent->cfg.sibs[1].sib2().rr_cfg_common, true);
 
-  activity_timer = outer_rrc->task_sched.get_unique_timer();
+  activity_timer = parent->task_sched.get_unique_timer();
   set_activity_timeout(MSG3_RX_TIMEOUT); // next UE response is Msg3
 
   mobility_handler.reset(new rrc_mobility(this));
+  return SRSLTE_SUCCESS;
 }
 
-rrc::ue::~ue() {}
-
 void* rrc::ue::operator new(size_t sz)
 {
   assert(sz == sizeof(ue));