simplify PDCP init and also bypass it for SRB0 on eNB

lib/include/srslte/interfaces/enb_interfaces.h

@@ -193,6 +193,7 @@ public:
   virtual void add_bearer(uint16_t rnti, uint32_t lcid) = 0;
   virtual void add_bearer(uint16_t rnti, uint32_t lcid, srslte::srslte_rlc_config_t cnfg) = 0;
   virtual void add_bearer_mrb(uint16_t rnti, uint32_t lcid) = 0;
+  virtual void write_sdu(uint16_t rnti, uint32_t lcid, srslte::unique_byte_buffer_t sdu)  = 0;
 };
 
 // PDCP interface for GTPU
@@ -237,6 +238,7 @@ public:
   virtual void read_pdu_bcch_dlsch(uint32_t sib_index, uint8_t *payload) = 0;
   virtual void read_pdu_pcch(uint8_t *payload, uint32_t payload_size) = 0; 
   virtual void max_retx_attempted(uint16_t rnti) = 0;
+  virtual void write_pdu(uint16_t rnti, uint32_t lcid, srslte::unique_byte_buffer_t sdu) = 0;
 };
 
 // RRC interface for MAC

lib/include/srslte/upper/pdcp.h

@@ -37,12 +37,8 @@ class pdcp
 public:
   pdcp();
   virtual ~pdcp();
-  void init(srsue::rlc_interface_pdcp *rlc_,
-            srsue::rrc_interface_pdcp *rrc_,
-            srsue::gw_interface_pdcp *gw_,
-            log *pdcp_log_,
-            uint32_t lcid_,
-            uint8_t direction_);
+  void
+       init(srsue::rlc_interface_pdcp* rlc_, srsue::rrc_interface_pdcp* rrc_, srsue::gw_interface_pdcp* gw_, log* pdcp_log_);
   void stop();
 
   // GW interface
@@ -82,14 +78,14 @@ public:
   void write_pdu_pcch(unique_byte_buffer_t sdu);
 
 private:
-  srsue::rlc_interface_pdcp *rlc;
-  srsue::rrc_interface_pdcp *rrc;
-  srsue::gw_interface_pdcp  *gw;
+  srsue::rlc_interface_pdcp* rlc = nullptr;
+  srsue::rrc_interface_pdcp* rrc = nullptr;
+  srsue::gw_interface_pdcp*  gw  = nullptr;
 
   typedef std::map<uint16_t, pdcp_entity_interface*> pdcp_map_t;
   typedef std::pair<uint16_t, pdcp_entity_interface*> pdcp_map_pair_t;
 
-  log         *pdcp_log;
+  log*             pdcp_log = nullptr;
   pdcp_map_t  pdcp_array, pdcp_array_mrb;
   pthread_rwlock_t rwlock;
 

lib/src/upper/pdcp.cc

@@ -25,10 +25,6 @@ namespace srslte {
 
 pdcp::pdcp()
 {
-  rlc = NULL;
-  rrc = NULL;
-  gw = NULL;
-  pdcp_log = NULL;
   pthread_rwlock_init(&rwlock, NULL);
 }
 
@@ -50,7 +46,10 @@ pdcp::~pdcp()
   pthread_rwlock_destroy(&rwlock);
 }
 
-void pdcp::init(srsue::rlc_interface_pdcp *rlc_, srsue::rrc_interface_pdcp *rrc_, srsue::gw_interface_pdcp *gw_, log *pdcp_log_, uint32_t lcid_, uint8_t direction_)
+void pdcp::init(srsue::rlc_interface_pdcp* rlc_,
+                srsue::rrc_interface_pdcp* rrc_,
+                srsue::gw_interface_pdcp*  gw_,
+                log*                       pdcp_log_)
 {
   rlc          = rlc_;
   rrc          = rrc_;

srsenb/src/stack/rrc/rrc.cc

@@ -1978,11 +1978,10 @@ void rrc::ue::send_dl_ccch(dl_ccch_msg_s* dl_ccch_msg)
     dl_ccch_msg->pack(bref);
     pdu->N_bytes = 1u + (uint32_t)bref.distance_bytes(pdu->msg);
 
-    char buf[32];
+    char buf[32] = {};
     sprintf(buf, "SRB0 - rnti=0x%x", rnti);
     parent->log_rrc_message(buf, Tx, pdu.get(), *dl_ccch_msg);
-
-    parent->pdcp->write_sdu(rnti, RB_ID_SRB0, std::move(pdu));
+    parent->rlc->write_sdu(rnti, RB_ID_SRB0, std::move(pdu));
   } else {
     parent->rrc_log->error("Allocating pdu\n");
   }
@@ -1998,12 +1997,10 @@ void rrc::ue::send_dl_dcch(dl_dcch_msg_s* dl_dcch_msg, srslte::unique_byte_buffe
     dl_dcch_msg->pack(bref);
     pdu->N_bytes = 1u + (uint32_t)bref.distance_bytes(pdu->msg);
 
-    char buf[32];
+    char buf[32] = {};
     sprintf(buf, "SRB1 - rnti=0x%x", rnti);
     parent->log_rrc_message(buf, Tx, pdu.get(), *dl_dcch_msg);
-
     parent->pdcp->write_sdu(rnti, RB_ID_SRB1, std::move(pdu));
-
   } else {
     parent->rrc_log->error("Allocating pdu\n");
   }

srsenb/src/stack/upper/pdcp.cc

@@ -52,7 +52,7 @@ void pdcp::add_user(uint16_t rnti)
   pthread_rwlock_rdlock(&rwlock);
   if (users.count(rnti) == 0) {
     srslte::pdcp *obj = new srslte::pdcp;
-    obj->init(&users[rnti].rlc_itf, &users[rnti].rrc_itf, &users[rnti].gtpu_itf, log_h, RB_ID_SRB0, SECURITY_DIRECTION_DOWNLINK);
+    obj->init(&users[rnti].rlc_itf, &users[rnti].rrc_itf, &users[rnti].gtpu_itf, log_h);
     users[rnti].rlc_itf.rnti  = rnti;
     users[rnti].gtpu_itf.rnti = rnti;
     users[rnti].rrc_itf.rnti  = rnti;

srsenb/src/stack/upper/rlc.cc

@@ -210,7 +210,11 @@ void rlc::user_interface::max_retx_attempted()
 
 void rlc::user_interface::write_pdu(uint32_t lcid, srslte::unique_byte_buffer_t sdu)
 {
+  if (lcid == RB_ID_SRB0) {
+    rrc->write_pdu(rnti, lcid, std::move(sdu));
+  } else {
     pdcp->write_pdu(rnti, lcid, std::move(sdu));
+  }
 }
 
 void rlc::user_interface::write_pdu_bcch_bch(srslte::unique_byte_buffer_t sdu)

srsue/src/stack/ue_stack_lte.cc

@@ -103,7 +103,7 @@ int ue_stack_lte::init(const stack_args_t& args_, srslte::logger* logger_)
 
   mac.init(phy, &rlc, &rrc, &mac_log);
   rlc.init(&pdcp, &rrc, &rlc_log, &mac, 0 /* RB_ID_SRB0 */);
-  pdcp.init(&rlc, &rrc, gw, &pdcp_log, 0 /* RB_ID_SRB0 */, SECURITY_DIRECTION_UPLINK);
+  pdcp.init(&rlc, &rrc, gw, &pdcp_log);
   nas.init(usim.get(), &rrc, gw, &nas_log, args.nas);
   rrc.init(phy, &mac, &rlc, &pdcp, &nas, usim.get(), gw, &mac, &rrc_log, args.rrc);