add basic support for TimingInfo field from tester

this fixes an issue where commands are received out of
order and we are therefore applying configs incorrectly. if
commands include a timinginfo we are now putting the command
on a queue that the SS reads after the start of a new TTI.

the security and cell reconfig commands will be added in another
PR after the AS_security command has been fixed.

srsue/test/ttcn3/hdr/ttcn3_helpers.h

@@ -29,6 +29,7 @@
 
 #include "rapidjson/document.h"     // rapidjson's DOM-style API
 #include "rapidjson/prettywriter.h" // for stringify JSON
+#include "ttcn3_interfaces.h"
 #include <algorithm>
 #include <assert.h>
 #include <bitset>
@@ -355,6 +356,32 @@ public:
 
     return config_flag.GetBool();
   }
+
+  static timing_info_t get_timing_info(Document& document)
+  {
+    timing_info_t timing = {};
+
+    // check for Now flag
+    if (document.HasMember("Common") && document["Common"].HasMember("TimingInfo") &&
+        document["Common"]["TimingInfo"].HasMember("Now")) {
+      timing.now = true;
+    }
+
+    if (document.HasMember("Common") && document["Common"].HasMember("TimingInfo") &&
+        document["Common"]["TimingInfo"].HasMember("SubFrame") &&
+        document["Common"]["TimingInfo"]["SubFrame"].HasMember("SFN") &&
+        document["Common"]["TimingInfo"]["SubFrame"]["SFN"].HasMember("Number")) {
+
+      timing.tti = document["Common"]["TimingInfo"]["SubFrame"]["SFN"]["Number"].GetInt() * 10;
+
+      // check SF index only
+      if (document["Common"]["TimingInfo"]["SubFrame"].HasMember("Subframe") &&
+          document["Common"]["TimingInfo"]["SubFrame"]["Subframe"].HasMember("Number")) {
+        timing.tti += document["Common"]["TimingInfo"]["SubFrame"]["Subframe"]["Number"].GetInt();
+      }
+    }
+    return timing;
+  }
 };
 
 #endif // SRSUE_TTCN3_HELPERS_H

srsue/test/ttcn3/hdr/ttcn3_interfaces.h

@@ -25,6 +25,11 @@
 #include "srslte/common/common.h"
 #include "srslte/interfaces/ue_interfaces.h"
 
+typedef struct {
+  bool     now; ///< If set to false, the TTI field contains a valid TTI
+  uint32_t tti;
+} timing_info_t;
+
 // Interfaces used by system interface to communicate with main component
 class ss_ut_interface
 {
@@ -45,8 +50,8 @@ public:
   virtual void     add_pch_pdu(srslte::unique_byte_buffer_t pdu)                                                  = 0;
   virtual void     set_cell_attenuation(std::string cell_name, const float attenuation)                           = 0;
   virtual void     set_cell_config(std::string cell_name, uint32_t earfcn, srslte_cell_t cell, const float power) = 0;
-  virtual void     add_srb(uint32_t lcid, srslte::pdcp_config_t pdcp_config)                                      = 0;
+  virtual void add_srb(const timing_info_t timing, const uint32_t lcid, const srslte::pdcp_config_t pdcp_config)  = 0;
-  virtual void     del_srb(uint32_t lcid)                                                                         = 0;
+  virtual void del_srb(const timing_info_t timing, const uint32_t lcid)                                           = 0;
   virtual uint32_t get_tti()                                                                                      = 0;
   virtual int      set_as_security(const uint32_t                            lcid,
                                    const std::array<uint8_t, 32>             k_rrc_enc,
@@ -60,8 +65,8 @@ public:
 class ss_srb_interface
 {
 public:
-  virtual void add_ccch_pdu(srslte::unique_byte_buffer_t pdu)                = 0;
+  virtual void add_ccch_pdu(const timing_info_t timing, srslte::unique_byte_buffer_t pdu)                = 0;
-  virtual void add_dcch_pdu(uint32_t lcid, srslte::unique_byte_buffer_t pdu) = 0;
+  virtual void add_dcch_pdu(const timing_info_t timing, uint32_t lcid, srslte::unique_byte_buffer_t pdu) = 0;
   virtual void reestablish_bearer(uint32_t lcid)                             = 0;
 };
 

srsue/test/ttcn3/hdr/ttcn3_srb_interface.h

@@ -119,7 +119,7 @@ private:
     pdu->N_bytes             = len;
     memcpy(pdu->msg, payload, pdu->N_bytes);
 
-    syssim->add_ccch_pdu(std::move(pdu));
+    syssim->add_ccch_pdu(ttcn3_helpers::get_timing_info(document), std::move(pdu));
 
     // TODO: is there a better way to check for RRCConnectionReestablishment?
     if (ccch_is_rrc_reestablishment(document)) {
@@ -137,7 +137,7 @@ private:
     pdu->N_bytes             = len;
     memcpy(pdu->msg, payload, pdu->N_bytes);
 
-    syssim->add_dcch_pdu(lcid, std::move(pdu));
+    syssim->add_dcch_pdu(ttcn3_helpers::get_timing_info(document), lcid, std::move(pdu));
   }
 
   bool ccch_is_rrc_reestablishment(Document& document)

srsue/test/ttcn3/hdr/ttcn3_sys_interface.h

@@ -212,6 +212,10 @@ private:
     const Value& b = a["ControlInfo"];
     assert(b.HasMember("CnfFlag"));
 
+    if (ttcn3_helpers::get_timing_info(document).now == false) {
+      log->error("Timing info not supported in %s\n", __FUNCTION__);
+    }
+
     // Handle cell creation
     if (document["Request"]["Cell"].HasMember("AddOrReconfigure")) {
       if (document["Request"]["Cell"]["AddOrReconfigure"].HasMember("Basic")) {
@@ -287,7 +291,6 @@ private:
         if (config.HasMember("AddOrReconfigure")) {
           uint32_t lcid = id["Srb"].GetInt();
           if (lcid > 0) {
-            log->info("Configure SRB%d\n", lcid);
             pdcp_config_t pdcp_cfg = {.bearer_id     = static_cast<uint8_t>(lcid),
                                       .rb_type       = PDCP_RB_IS_SRB,
                                       .tx_direction  = SECURITY_DIRECTION_DOWNLINK,
@@ -295,12 +298,11 @@ private:
                                       .sn_len        = PDCP_SN_LEN_5,
                                       .t_reorderding = srslte::pdcp_t_reordering_t::ms500,
                                       .discard_timer = srslte::pdcp_discard_timer_t::infinity};
-            syssim->add_srb(lcid, pdcp_cfg);
+            syssim->add_srb(ttcn3_helpers::get_timing_info(document), lcid, pdcp_cfg);
           }
         } else if (config.HasMember("Release")) {
-          log->info("Releasing SRB%d\n", id["Srb"].GetInt());
           uint32_t lcid = id["Srb"].GetInt();
-          syssim->del_srb(lcid);
+          syssim->del_srb(ttcn3_helpers::get_timing_info(document), lcid);
         } else {
           log->error("Unknown config.\n");
         }
@@ -336,6 +338,10 @@ private:
     const Value& cells = req["CellAttenuationList"];
     assert(cells.IsArray());
 
+    if (ttcn3_helpers::get_timing_info(document).now == false) {
+      log->error("Timing info not supported in %s\n", __FUNCTION__);
+    }
+
     // iterate over all bearers and configure them
     for (Value::ConstValueIterator itr = cells.Begin(); itr != cells.End(); ++itr) {
       assert(itr->HasMember("CellId"));
@@ -422,6 +428,11 @@ private:
     const Value& req = document["Request"];
     assert(req.HasMember("AS_Security"));
 
+    if (ttcn3_helpers::get_timing_info(document).now == false) {
+      log->error("Timing info not supported in %s\n", __FUNCTION__);
+      // continue ...
+    }
+
     // check AS security start
     const Value& as_sec = req["AS_Security"];
     if (as_sec.HasMember("StartRestart")) {

srsue/test/ttcn3/hdr/ttcn3_syssim.h

@@ -24,7 +24,6 @@
 
 #include "dut_utils.h"
 #include "srslte/common/pdu_queue.h"
-#include "srslte/common/threads.h"
 #include "srslte/upper/pdcp.h"
 #include "srslte/upper/rlc.h"
 #include "ttcn3_common.h"
@@ -196,10 +195,20 @@ public:
     tti = (tti + 1) % 10240;
 
     log.step(tti);
-    log.debug("Start new TTI\n");
+    log.debug("Start TTI\n");
 
     ue->set_current_tti(tti);
 
+    // check scheduled actions for this TTI
+    if (tti_actions.find(tti) != tti_actions.end()) {
+      while (!tti_actions[tti].empty()) {
+        log.debug("Running scheduled action\n");
+        move_task_t task = std::move(tti_actions[tti].back());
+        task();
+        tti_actions[tti].pop_back();
+      }
+    }
+
     // process events, if any
     while (not event_queue.empty()) {
       ss_events_t ev = event_queue.wait_pop();
@@ -439,14 +448,14 @@ public:
     prach_preamble_index = preamble_index_;
   }
 
-  // Called from PHY but always from the SS main thread with lock being hold
+  // Called from PHY
   void sr_req(uint32_t tti_tx)
   {
     log.info("Received SR from PHY\n");
     sr_tti = tti_tx;
   }
 
-  // Called from PHY but always from the SS main thread with lock being hold
+  // Called from PHY
   void tx_pdu(const uint8_t* payload, const int len, const uint32_t tx_tti)
   {
     if (payload == NULL) {
@@ -692,8 +701,6 @@ public:
 
   void set_cell_config(std::string name, uint32_t earfcn_, srslte_cell_t cell_, const float power)
   {
-    std::lock_guard<std::mutex> lock(mutex);
-
     // check if cell already exists
     if (not syssim_has_cell(name)) {
       // insert new cell
@@ -725,7 +732,6 @@ public:
 
   void set_cell_attenuation(std::string cell_name, const float value)
   {
-    std::lock_guard<std::mutex> lock(mutex);
     if (not syssim_has_cell(cell_name)) {
       log.error("Can't set cell power. Cell not found.\n");
     }
@@ -765,8 +771,6 @@ public:
 
   void add_bcch_dlsch_pdu(const string cell_name, unique_byte_buffer_t pdu)
   {
-    std::lock_guard<std::mutex> lock(mutex);
-
     if (not syssim_has_cell(cell_name)) {
       log.error("Can't add BCCH to cell. Cell not found.\n");
     }
@@ -780,18 +784,31 @@ public:
     }
   }
 
-  void add_ccch_pdu(unique_byte_buffer_t pdu)
+  void add_ccch_pdu(const timing_info_t timing, unique_byte_buffer_t pdu)
   {
-    std::lock_guard<std::mutex> lock(mutex);
+    if (timing.now) {
-
       // Add to SRB0 Tx queue
       rlc.write_sdu(0, std::move(pdu));
+    } else {
+      log.debug("Scheduling CCCH PDU for TTI=%d\n", timing.tti);
+      auto task = [this](srslte::unique_byte_buffer_t& pdu) { rlc.write_sdu(0, std::move(pdu)); };
+      tti_actions[timing.tti].push_back(std::bind(task, std::move(pdu)));
+    }
   }
 
-  void add_dcch_pdu(uint32_t lcid, unique_byte_buffer_t pdu)
+  void add_dcch_pdu(const timing_info_t timing, uint32_t lcid, unique_byte_buffer_t pdu)
   {
-    std::lock_guard<std::mutex> lock(mutex);
+    if (timing.now) {
+      add_dcch_pdu_impl(lcid, std::move(pdu));
+    } else {
+      log.debug("Scheduling DCCH PDU for TTI=%d\n", timing.tti);
+      auto task = [this](uint32_t lcid, srslte::unique_byte_buffer_t& pdu) { add_dcch_pdu_impl(lcid, std::move(pdu)); };
+      tti_actions[timing.tti].push_back(std::bind(task, lcid, std::move(pdu)));
+    }
+  }
 
+  void add_dcch_pdu_impl(uint32_t lcid, unique_byte_buffer_t pdu)
+  {
     // push to PDCP and create DL grant for it
     log.info("Writing PDU (%d B) to LCID=%d\n", pdu->N_bytes, lcid);
     pdcp.write_sdu(lcid, std::move(pdu), true);
@@ -799,7 +816,6 @@ public:
 
   void add_pch_pdu(unique_byte_buffer_t pdu)
   {
-    std::lock_guard<std::mutex> lock(mutex);
     log.info("Received PCH PDU (%d B)\n", pdu->N_bytes);
 
     // Prepare MAC grant for PCH
@@ -814,9 +830,18 @@ public:
 
   void step_timer() { timers.step_all(); }
 
-  void add_srb(uint32_t lcid, pdcp_config_t pdcp_config)
+  void add_srb(const timing_info_t timing, const uint32_t lcid, const pdcp_config_t pdcp_config)
+  {
+    if (timing.now) {
+      add_srb_impl(lcid, pdcp_config);
+    } else {
+      log.debug("Scheduling SRB%d addition for TTI=%d\n", lcid, timing.tti);
+      tti_actions[timing.tti].push_back([this, lcid, pdcp_config]() { add_srb_impl(lcid, pdcp_config); });
+    }
+  }
+
+  void add_srb_impl(const uint32_t lcid, const pdcp_config_t pdcp_config)
   {
-    std::lock_guard<std::mutex> lock(mutex);
     log.info("Adding SRB%d\n", lcid);
     pdcp.add_bearer(lcid, pdcp_config);
     rlc.add_bearer(lcid, srslte::rlc_config_t::srb_config(lcid));
@@ -832,15 +857,23 @@ public:
 
   void reestablish_bearer(uint32_t lcid)
   {
-    std::lock_guard<std::mutex> lock(mutex);
     log.info("Reestablishing LCID=%d\n", lcid);
     pdcp.reestablish(lcid);
     rlc.reestablish(lcid);
   }
 
-  void del_srb(uint32_t lcid)
+  void del_srb(const timing_info_t timing, const uint32_t lcid)
+  {
+    if (timing.now) {
+      del_srb_impl(lcid);
+    } else {
+      log.debug("Scheduling SRB%d deletion for TTI=%d\n", lcid, timing.tti);
+      tti_actions[timing.tti].push_back([this, lcid]() { del_srb_impl(lcid); });
+    }
+  }
+
+  void del_srb_impl(uint32_t lcid)
   {
-    std::lock_guard<std::mutex> lock(mutex);
     log.info("Deleting SRB%d\n", lcid);
     // Only delete SRB1/2
     if (lcid > 0) {
@@ -1027,6 +1060,11 @@ private:
   bool                  last_dl_ndi[2 * FDD_HARQ_DELAY_MS] = {};
   bool                  last_ul_ndi[2 * FDD_HARQ_DELAY_MS] = {};
 
+  // For events/actions that need to be carried out in a specific TTI
+  typedef std::vector<move_task_t>              task_list_t;
+  typedef std::map<const uint32_t, task_list_t> tti_action_map_t;
+  tti_action_map_t                              tti_actions;
+
   // Map between the cellId (name) used by 3GPP test suite and srsLTE cell struct
   typedef struct {
     std::string                       name;