Merge pull request #2214 from softwareradiosystems/pr_mac_buffers

Limit the number of UL buffers in MAC and deallocate old ones

lib/include/srslte/interfaces/enb_interfaces.h

@@ -180,12 +180,12 @@ public:
    *
    * @param tti the given TTI
    * @param rnti the UE identifier in the eNb
-   * @param pdu_ptr pointer to the uplink buffer
+   * @param enb_cc_idx the eNb Cell/Carrier identifier
    * @param nof_bytes the number of grants carrierd by the PUSCH message
    * @param crc_res the CRC check, set to true if the message was decoded succesfully
    * @return SRSLTE_SUCCESS if no error occurs, SRSLTE_ERROR* if an error occurs
    */
-  virtual int push_pdu(uint32_t tti_rx, uint16_t rnti, const uint8_t* pdu_ptr, uint32_t nof_bytes, bool crc_res) = 0;
+  virtual int push_pdu(uint32_t tti_rx, uint16_t rnti, uint32_t enb_cc_idx, uint32_t nof_bytes, bool crc_res) = 0;
 
   virtual int  get_dl_sched(uint32_t tti, dl_sched_list_t& dl_sched_res)                = 0;
   virtual int  get_mch_sched(uint32_t tti, bool is_mcch, dl_sched_list_t& dl_sched_res) = 0;

srsenb/hdr/stack/enb_stack_lte.h

@@ -80,9 +80,9 @@ public:
   {
     return mac.crc_info(tti, rnti, enb_cc_idx, nof_bytes, crc_res);
   }
-  int push_pdu(uint32_t tti, uint16_t rnti, const uint8_t* pdu_ptr, uint32_t nof_bytes, bool crc_res) final
+  int push_pdu(uint32_t tti, uint16_t rnti, uint32_t enb_cc_idx, uint32_t nof_bytes, bool crc_res) final
   {
-    return mac.push_pdu(tti, rnti, pdu_ptr, nof_bytes, crc_res);
+    return mac.push_pdu(tti, rnti, enb_cc_idx, nof_bytes, crc_res);
   }
   int get_dl_sched(uint32_t tti, dl_sched_list_t& dl_sched_res) final { return mac.get_dl_sched(tti, dl_sched_res); }
   int get_mch_sched(uint32_t tti, bool is_mcch, dl_sched_list_t& dl_sched_res) final

srsenb/hdr/stack/mac/mac.h

@@ -56,7 +56,7 @@ public:
   int ta_info(uint32_t tti, uint16_t rnti, float ta_us) override;
   int ack_info(uint32_t tti, uint16_t rnti, uint32_t enb_cc_idx, uint32_t tb_idx, bool ack) override;
   int crc_info(uint32_t tti, uint16_t rnti, uint32_t enb_cc_idx, uint32_t nof_bytes, bool crc_res) override;
-  int push_pdu(uint32_t tti, uint16_t rnti, const uint8_t* pdu_ptr, uint32_t nof_bytes, bool crc_res) override;
+  int push_pdu(uint32_t tti, uint16_t rnti, uint32_t enb_cc_idx, uint32_t nof_bytes, bool crc_res) override;
 
   int  get_dl_sched(uint32_t tti_tx_dl, dl_sched_list_t& dl_sched_res) override;
   int  get_ul_sched(uint32_t tti_tx_ul, ul_sched_list_t& ul_sched_res) override;

srsenb/hdr/stack/mac/ue.h

@@ -15,6 +15,7 @@
 
 #include "mac_metrics.h"
 #include "srslte/common/block_queue.h"
+#include "srslte/adt/circular_array.h"
 #include "srslte/common/log.h"
 #include "srslte/common/mac_pcap.h"
 #include "srslte/interfaces/enb_interfaces.h"
@@ -71,10 +72,11 @@ public:
   srslte_softbuffer_rx_t* get_rx_softbuffer(const uint32_t ue_cc_idx, const uint32_t tti);
 
   bool     process_pdus();
-  uint8_t* request_buffer(const uint32_t len);
+  uint8_t* request_buffer(uint32_t tti, uint32_t ue_cc_idx, const uint32_t len);
   void     process_pdu(uint8_t* pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel) override;
-  void     push_pdu(const uint8_t* pdu_ptr, uint32_t len);
-  void     deallocate_pdu(const uint8_t* pdu_ptr);
+  void     push_pdu(uint32_t tti, uint32_t ue_cc_idx, uint32_t len);
+  void     deallocate_pdu(uint32_t tti, uint32_t ue_cc_idx);
+  void     clear_old_buffers(uint32_t tti);
 
   void metrics_read(mac_ue_metrics_t* metrics_);
   void metrics_rx(bool crc, uint32_t tbs);
@@ -122,6 +124,8 @@ private:
   std::vector<std::array<std::array<srslte::unique_byte_buffer_t, SRSLTE_MAX_TB>, SRSLTE_FDD_NOF_HARQ> >
       tx_payload_buffer;
 
+  std::vector<std::map<uint32_t, uint8_t*> > rx_used_buffers;
+
   srslte::block_queue<uint32_t> pending_ta_commands;
   ta                            ta_fsm;
 

srsenb/src/phy/lte/cc_worker.cc

@@ -374,7 +374,7 @@ void cc_worker::decode_pusch(stack_interface_phy_lte::ul_sched_grant_t* grants,
       // Inform MAC about the CRC result
       phy->stack->crc_info(tti_rx, rnti, cc_idx, ul_cfg.pusch.grant.tb.tbs / 8, pusch_res.crc);
       // Push PDU buffer
-      phy->stack->push_pdu(tti_rx, rnti, grants[i].data, ul_cfg.pusch.grant.tb.tbs / 8, pusch_res.crc);
+      phy->stack->push_pdu(tti_rx, rnti, cc_idx, ul_cfg.pusch.grant.tb.tbs / 8, pusch_res.crc);
       // Logging
       if (log_h->get_level() >= srslte::LOG_LEVEL_INFO) {
         char str[512];

srsenb/src/stack/mac/mac.cc

@@ -323,7 +323,7 @@ int mac::crc_info(uint32_t tti_rx, uint16_t rnti, uint32_t enb_cc_idx, uint32_t
   return scheduler.ul_crc_info(tti_rx, rnti, enb_cc_idx, crc);
 }
 
-int mac::push_pdu(uint32_t tti_rx, uint16_t rnti, const uint8_t* pdu_ptr, uint32_t nof_bytes, bool crc)
+int mac::push_pdu(uint32_t tti_rx, uint16_t rnti, uint32_t enb_cc_idx, uint32_t nof_bytes, bool crc)
 {
   srslte::rwlock_read_guard lock(rwlock);
 
@@ -331,14 +331,21 @@ int mac::push_pdu(uint32_t tti_rx, uint16_t rnti, const uint8_t* pdu_ptr, uint32
     return SRSLTE_ERROR;
   }
 
+  std::array<int, SRSLTE_MAX_CARRIERS> enb_ue_cc_map = scheduler.get_enb_ue_cc_map(rnti);
+  if (enb_ue_cc_map[enb_cc_idx] < 0) {
+    Error("User rnti=0x%x is not activated for carrier %d\n", rnti, enb_cc_idx);
+    return SRSLTE_ERROR;
+  }
+  uint32_t ue_cc_idx = enb_ue_cc_map[enb_cc_idx];
+
   // push the pdu through the queue if received correctly
   if (crc) {
     Info("Pushing PDU rnti=0x%x, tti_rx=%d, nof_bytes=%d\n", rnti, tti_rx, nof_bytes);
-    ue_db[rnti]->push_pdu(pdu_ptr, nof_bytes);
+    ue_db[rnti]->push_pdu(tti_rx, ue_cc_idx, nof_bytes);
     stack_task_queue.push([this]() { process_pdus(); });
   } else {
     Debug("Discarting PDU rnti=0x%x, tti_rx=%d, nof_bytes=%d\n", rnti, tti_rx, nof_bytes);
-    ue_db[rnti]->deallocate_pdu(pdu_ptr);
+    ue_db[rnti]->deallocate_pdu(tti_rx, ue_cc_idx);
   }
   return SRSLTE_SUCCESS;
 }
@@ -906,7 +913,8 @@ int mac::get_ul_sched(uint32_t tti_tx_ul, ul_sched_list_t& ul_sched_res_list)
             if (sched_result.pusch[n].current_tx_nb == 0) {
               srslte_softbuffer_rx_reset_tbs(phy_ul_sched_res->pusch[n].softbuffer_rx, sched_result.pusch[i].tbs * 8);
             }
-            phy_ul_sched_res->pusch[n].data = ue_db[rnti]->request_buffer(sched_result.pusch[i].tbs);
+            phy_ul_sched_res->pusch[n].data =
+                ue_db[rnti]->request_buffer(tti_tx_ul, sched_result.pusch[i].dci.ue_cc_idx, sched_result.pusch[i].tbs);
             if (phy_ul_sched_res->pusch[n].data) {
               phy_ul_sched_res->nof_grants++;
             } else {
@@ -932,6 +940,10 @@ int mac::get_ul_sched(uint32_t tti_tx_ul, ul_sched_list_t& ul_sched_res_list)
     }
     phy_ul_sched_res->nof_phich = sched_result.nof_phich_elems;
   }
+  // clear old buffers from all users
+  for (auto& u : ue_db) {
+    u.second->clear_old_buffers(tti_tx_ul);
+  }
   return SRSLTE_SUCCESS;
 }
 

srsenb/src/stack/mac/ue.cc

@@ -44,6 +44,7 @@ ue::ue(uint16_t                 rnti_,
   pdus(128),
   nof_rx_harq_proc(nof_rx_harq_proc_),
   nof_tx_harq_proc(nof_tx_harq_proc_),
+  rx_used_buffers(nof_cells_),
   ta_fsm(this)
 {
   srslte::byte_buffer_pool* pool = srslte::byte_buffer_pool::get_instance();
@@ -76,6 +77,12 @@ ue::~ue()
       srslte_softbuffer_tx_free(&buffer);
     }
   }
+  for (auto& rx_buffers_cc : rx_used_buffers) {
+    for (auto& q : rx_buffers_cc) {
+      pdus.deallocate(q.second);
+    }
+    rx_buffers_cc.clear();
+  }
 }
 
 void ue::reset()
@@ -161,13 +168,40 @@ ue::get_tx_softbuffer(const uint32_t ue_cc_idx, const uint32_t harq_process, con
   return &softbuffer_tx.at(ue_cc_idx).at((harq_process * SRSLTE_MAX_TB + tb_idx) % nof_tx_harq_proc);
 }
 
-uint8_t* ue::request_buffer(const uint32_t len)
+uint8_t* ue::request_buffer(uint32_t tti, uint32_t ue_cc_idx, const uint32_t len)
 {
+  uint8_t* pdu = nullptr;
   if (len > 0) {
-    return pdus.request(len);
+    // Deallocate oldest buffer if we didn't deallocate it
+    if (!rx_used_buffers.at(ue_cc_idx).count(tti)) {
+      pdu = pdus.request(len);
+      if (pdu) {
+        rx_used_buffers.at(ue_cc_idx).emplace(tti, pdu);
       } else {
-    log_h->warning("Requesting buffer for zero bytes\n");
-    return nullptr;
+        Error("UE buffers: Requesting buffer from pool\n");
+      }
+    } else {
+      Error("UE buffers: buffer for tti=%d already allocated\n", tti);
+    }
+  } else {
+    Error("UE buffers: Requesting buffer for zero bytes\n");
+  }
+  return pdu;
+}
+
+void ue::clear_old_buffers(uint32_t tti)
+{
+  // remove old buffers
+  for (auto& rx_buffer_cc : rx_used_buffers) {
+    for (auto it = rx_buffer_cc.begin(); it != rx_buffer_cc.end();) {
+      if (srslte_tti_interval(tti, it->first) > 20) {
+        Warning("UE buffers: Removing old buffer tti=%d, rnti=%d, now is %d\n", it->first, rnti, tti);
+        pdus.deallocate(it->second);
+        it = rx_buffer_cc.erase(it);
+      } else {
+        ++it;
+      }
+    }
   }
 }
 
@@ -293,21 +327,33 @@ void ue::process_pdu(uint8_t* pdu, uint32_t nof_bytes, srslte::pdu_queue::channe
   Debug("MAC PDU processed\n");
 }
 
-void ue::deallocate_pdu(const uint8_t* pdu_ptr)
+void ue::deallocate_pdu(uint32_t tti, uint32_t ue_cc_idx)
 {
-  if (pdu_ptr) {
-    pdus.deallocate(pdu_ptr);
+  if (rx_used_buffers.at(ue_cc_idx).count(tti)) {
+    pdus.deallocate(rx_used_buffers.at(ue_cc_idx).at(tti));
+    rx_used_buffers.at(ue_cc_idx).erase(tti);
   } else {
-    Error("Error deallocating PDU: null ptr\n");
+    Warning("UE buffers: Null RX PDU pointer in deallocate_pdu for rnti=0x%x pid=%d cc_idx=%d\n",
+            rnti,
+            tti % nof_rx_harq_proc,
+            ue_cc_idx);
   }
 }
 
-void ue::push_pdu(const uint8_t* pdu_ptr, uint32_t len)
+void ue::push_pdu(uint32_t tti, uint32_t ue_cc_idx, uint32_t len)
 {
-  if (pdu_ptr && len > 0) {
-    pdus.push(pdu_ptr, len);
+  if (rx_used_buffers.at(ue_cc_idx).count(tti)) {
+    if (len > 0) {
+      pdus.push(rx_used_buffers.at(ue_cc_idx).at(tti), len);
     } else {
-    Error("Error pushing PDU: ptr=%p, len=%d\n", pdu_ptr, len);
+      Error("Error pushing PDU: null length\n");
+    }
+    rx_used_buffers.at(ue_cc_idx).erase(tti);
+  } else {
+    Warning("UE buffers: Null RX PDU pointer in push_pdu for rnti=0x%x pid=%d cc_idx=%d\n",
+            rnti,
+            tti % nof_rx_harq_proc,
+            ue_cc_idx);
   }
 }
 

srsenb/test/phy/enb_phy_test.cc

@@ -493,7 +493,7 @@ public:
 
     return 0;
   }
-  int push_pdu(uint32_t tti, uint16_t rnti, const uint8_t* pdu_ptr, uint32_t nof_bytes, bool crc_res) override
+  int push_pdu(uint32_t tti, uint16_t rnti, uint32_t cc_idx, uint32_t nof_bytes, bool crc_res) override
   {
     log_h.info("Received push_pdu tti=%d; rnti=0x%x; ack=%d;\n", tti, rnti, crc_res);
     notify_push_pdu();