Process BCCH from pdu_process thread. Process PCCH from new thread in RRC

lib/include/srslte/common/pdu_queue.h

@@ -41,10 +41,15 @@ namespace srslte {
 class pdu_queue
 {
 public:
+  typedef enum {
+    DCH,
+    BCH,
+    MCH
+  } channel_t;
   class process_callback
   {
     public:
-      virtual void process_pdu(uint8_t *buff, uint32_t len, uint32_t tstamp) = 0;
+      virtual void process_pdu(uint8_t *buff, uint32_t len, channel_t channel, uint32_t tstamp) = 0;
   };
 
   pdu_queue(uint32_t pool_size = DEFAULT_POOL_SIZE) : pool(pool_size), callback(NULL), log_h(NULL) {}
@@ -52,7 +57,7 @@ public:
 
   uint8_t* request(uint32_t len);
   void     deallocate(uint8_t* pdu);
-  void     push(uint8_t *ptr, uint32_t len, uint32_t tstamp = 0);
+  void     push(uint8_t *ptr, uint32_t len, channel_t channel = DCH, uint32_t tstamp = 0);
 
   bool   process_pdus();
 
@@ -64,6 +69,7 @@ private:
     uint8_t  ptr[MAX_PDU_LEN];
     uint32_t len;
     uint32_t tstamp;
+    channel_t channel;
     #ifdef SRSLTE_BUFFER_POOL_LOG_ENABLED
       char   debug_name[128];
     #endif

lib/src/common/pdu_queue.cc

@@ -74,12 +74,13 @@ void pdu_queue::deallocate(uint8_t* pdu)
  * This function enqueues the packet and returns quicly because ACK 
  * deadline is important here. 
  */ 
-void pdu_queue::push(uint8_t *ptr, uint32_t len, uint32_t tstamp)
+void pdu_queue::push(uint8_t *ptr, uint32_t len, channel_t channel, uint32_t tstamp)
 {
   if (ptr) {
     pdu_t *pdu  = (pdu_t*) ptr;
     pdu->len    = len;
     pdu->tstamp = tstamp;
+    pdu->channel = channel;
     pdu_q.push(pdu);
   } else {
     log_h->warning("Error pushing pdu: ptr is empty\n");
@@ -93,11 +94,13 @@ bool pdu_queue::process_pdus()
   pdu_t *pdu;
   while(pdu_q.try_pop(&pdu)) {
     if (callback) {
-      callback->process_pdu(pdu->ptr, pdu->len, pdu->tstamp);
+      callback->process_pdu(pdu->ptr, pdu->len, pdu->channel, pdu->tstamp);
     }
+    if (pdu->channel == DCH) {
       if (!pool.deallocate(pdu)) {
         log_h->warning("Error deallocating from buffer pool in process_pdus(): buffer not created in this pool.\n");
       }
+    }
     cnt++;
     have_data = true;
   }

srsenb/hdr/mac/ue.h

@@ -95,7 +95,7 @@ public:
   
   bool     process_pdus(); 
   uint8_t *request_buffer(uint32_t tti, uint32_t len); 
-  void     process_pdu(uint8_t *pdu, uint32_t nof_bytes, uint32_t tstamp);
+  void     process_pdu(uint8_t *pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel, uint32_t tstamp);
   void     push_pdu(uint32_t tti, uint32_t len); 
   void     deallocate_pdu(uint32_t tti);
   

srsenb/src/mac/ue.cc

@@ -142,7 +142,7 @@ void ue::set_tti(uint32_t tti) {
 
 #include <assert.h>
 
-void ue::process_pdu(uint8_t* pdu, uint32_t nof_bytes, uint32_t tstamp)
+void ue::process_pdu(uint8_t* pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel, uint32_t tstamp)
 {
   // Unpack ULSCH MAC PDU 
   mac_msg_ul.init_rx(nof_bytes, true);

srsue/hdr/mac/demux.h

@@ -51,12 +51,13 @@ public:
   
   void     push_pdu(uint8_t *buff, uint32_t nof_bytes, uint32_t tstamp);
   void     push_pdu_bcch(uint8_t *buff, uint32_t nof_bytes, uint32_t tstamp);
+  void     push_pdu_mch(uint8_t *buff, uint32_t nof_bytes, uint32_t tstamp);
   void     push_pdu_temp_crnti(uint8_t *buff, uint32_t nof_bytes);
 
   void     set_uecrid_callback(bool (*callback)(void*, uint64_t), void *arg);
   bool     get_uecrid_successful();
 
-  void     process_pdu(uint8_t *pdu, uint32_t nof_bytes, uint32_t tstamp);
+  void     process_pdu(uint8_t *pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel, uint32_t tstamp);
   
 private:
   const static int MAX_PDU_LEN     = 150*1024/8; // ~ 150 Mbps  

srsue/hdr/upper/rrc.h

@@ -36,6 +36,7 @@
 #include "srslte/interfaces/ue_interfaces.h"
 #include "srslte/common/security.h"
 #include "srslte/common/threads.h"
+#include "srslte/common/block_queue.h"
 
 #include <math.h>
 #include <map>
@@ -253,6 +254,7 @@ class rrc
   ,public rrc_interface_pdcp
   ,public rrc_interface_rlc
   ,public srslte::timer_callback
+  ,public thread
 {
 public:
   rrc();
@@ -310,6 +312,21 @@ public:
 
 
 private:
+
+  typedef struct {
+    enum {
+      PCCH,
+      STOP
+    } command;
+    byte_buffer_t *pdu;
+  } cmd_msg_t;
+
+  bool running;
+  srslte::block_queue<cmd_msg_t> cmd_q;
+  void run_thread();
+
+  void process_pcch(byte_buffer_t *pdu);
+
   srslte::byte_buffer_pool *pool;
   srslte::log *rrc_log;
   phy_interface_rrc *phy;

srsue/src/mac/demux.cc

@@ -107,27 +107,29 @@ void demux::push_pdu_temp_crnti(uint8_t *buff, uint32_t nof_bytes)
     
     Debug("Saved MAC PDU with Temporal C-RNTI in buffer\n");
     
-    pdus.push(buff, nof_bytes);
+    pdus.push(buff, nof_bytes, srslte::pdu_queue::DCH);
   } else {
     Warning("Trying to push PDU with payload size zero\n");
   }
 }
 
 /* Demultiplexing of logical channels and dissassemble of MAC CE
- * This function enqueues the packet and returns quicly because ACK 
+ * This function enqueues the packet and returns quickly because ACK
  * deadline is important here.
  */
 void demux::push_pdu(uint8_t *buff, uint32_t nof_bytes, uint32_t tstamp) {
-  return pdus.push(buff, nof_bytes, tstamp);
+  return pdus.push(buff, nof_bytes, srslte::pdu_queue::DCH, tstamp);
 }
 
 /* Demultiplexing of MAC PDU associated with SI-RNTI. The PDU passes through
 * the MAC in transparent mode.
-* Warning: In this case function sends the message to RLC now, since SI blocks do not
-* require ACK feedback to be transmitted quickly.
 */
 void demux::push_pdu_bcch(uint8_t *buff, uint32_t nof_bytes, uint32_t tstamp) {
-  rlc->write_pdu_bcch_dlsch(buff, nof_bytes);
+  pdus.push(buff, nof_bytes, srslte::pdu_queue::BCH, tstamp);
+}
+
+void demux::push_pdu_mch(uint8_t *buff, uint32_t nof_bytes, uint32_t tstamp) {
+  pdus.push(buff, nof_bytes, srslte::pdu_queue::MCH, tstamp);
 }
 
 bool demux::process_pdus()
@@ -135,15 +137,25 @@ bool demux::process_pdus()
   return pdus.process_pdus();
 }
 
-void demux::process_pdu(uint8_t *mac_pdu, uint32_t nof_bytes, uint32_t tstamp)
+void demux::process_pdu(uint8_t *mac_pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel, uint32_t tstamp)
 {
+  Debug("Processing MAC PDU channel %d\n", channel);
+  switch(channel) {
+    case srslte::pdu_queue::DCH:
       // Unpack DLSCH MAC PDU
       mac_msg.init_rx(nof_bytes);
       mac_msg.parse_packet(mac_pdu);
 
       process_sch_pdu(&mac_msg);
       //srslte_vec_fprint_byte(stdout, mac_pdu, nof_bytes);
-  Debug("MAC PDU processed\n");
+      break;
+    case srslte::pdu_queue::BCH:
+      rlc->write_pdu_bcch_dlsch(mac_pdu, nof_bytes);
+      break;
+    case srslte::pdu_queue::MCH:
+      // Process downlink MCH
+      break;
+  }
 }
 
 void demux::process_sch_pdu(srslte::sch_pdu *pdu_msg)

srsue/src/upper/rrc.cc

@@ -56,6 +56,7 @@ rrc::rrc()
   serving_cell = new cell_t();
   neighbour_cells.reserve(NOF_NEIGHBOUR_CELLS);
   initiated = false;
+  running = false;
 }
 
 rrc::~rrc()
@@ -139,10 +140,17 @@ void rrc::init(phy_interface_rrc *phy_,
   // set seed for rand (used in attach)
   srand(time(NULL));
 
+  running = true;
+  start();
   initiated = true;
 }
 
 void rrc::stop() {
+  running = false;
+  cmd_msg_t msg;
+  msg.command = cmd_msg_t::STOP;
+  cmd_q.push(msg);
+  wait_thread_finish();
 }
 
 rrc_state_t rrc::get_state() {
@@ -161,6 +169,23 @@ void rrc::set_args(rrc_args_t *args) {
   memcpy(&this->args, args, sizeof(rrc_args_t));
 }
 
+/*
+ * Low priority thread to run functions that can not be executed from main thread
+ */
+void rrc::run_thread() {
+  while(running) {
+    cmd_msg_t msg = cmd_q.wait_pop();
+    switch(msg.command) {
+      case cmd_msg_t::STOP:
+        return;
+      case cmd_msg_t::PCCH:
+        process_pcch(msg.pdu);
+        break;
+    }
+  }
+}
+
+
 /*
  *
  * RRC State Machine
@@ -1639,6 +1664,13 @@ void rrc::handle_sib13()
 *
 *******************************************************************************/
 void rrc::write_pdu_pcch(byte_buffer_t *pdu) {
+  cmd_msg_t msg;
+  msg.pdu = pdu;
+  msg.command = cmd_msg_t::PCCH;
+  cmd_q.push(msg);
+}
+
+void rrc::process_pcch(byte_buffer_t *pdu) {
   if (pdu->N_bytes > 0 && pdu->N_bytes < SRSLTE_MAX_BUFFER_SIZE_BITS) {
     rrc_log->info_hex(pdu->msg, pdu->N_bytes, "PCCH message received %d bytes\n", pdu->N_bytes);
     rrc_log->info("PCCH message Stack latency: %ld us\n", pdu->get_latency_us());