Merge remote-tracking branch 'origin/nr-pdcp-improvements' into integration_2021_wk10

cmake_targets/CMakeLists.txt

@@ -1967,7 +1967,8 @@ set(NR_PDCP_SRC
   ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_oai_api.c
   ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_ue_manager.c
   ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_entity.c
-  ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_entity_drb_am.c
+  ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_sdu.c
+  ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_timer_thread.c
   ${OPENAIR2_DIR}/LAYER2/nr_pdcp/nr_pdcp_security_nea2.c
   ${OPENAIR2_DIR}/LAYER2/nr_pdcp/asn1_utils.c
   )

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c

@@ -364,7 +364,9 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP,
   /* send tick to RLC and RRC every ms */
   if ((slot & ((1 << *scc->ssbSubcarrierSpacing) - 1)) == 0) {
     void nr_rlc_tick(int frame, int subframe);
+    void nr_pdcp_tick(int frame, int subframe);
     nr_rlc_tick(frame, slot >> *scc->ssbSubcarrierSpacing);
+    nr_pdcp_tick(frame, slot >> *scc->ssbSubcarrierSpacing);
     nr_rrc_trigger(&ctxt, 0 /*CC_id*/, frame, slot >> *scc->ssbSubcarrierSpacing);
   }
 

openair2/LAYER2/nr_pdcp/nr_pdcp_entity.c

@@ -21,24 +21,222 @@
 
 #include "nr_pdcp_entity.h"
 
-#include "nr_pdcp_entity_drb_am.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
 #include "nr_pdcp_security_nea2.h"
+#include "nr_pdcp_sdu.h"
 
 #include "LOG/log.h"
 
-nr_pdcp_entity_t *new_nr_pdcp_entity_srb(
+static void nr_pdcp_entity_recv_pdu(nr_pdcp_entity_t *entity,
-    int is_gnb, int rb_id,
+                                    char *_buffer, int size)
-    void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
-                        char *buf, int size),
-    void *deliver_sdu_data,
-    void (*deliver_pdu)(void *deliver_pdu_data, struct nr_pdcp_entity_t *entity,
-                        char *buf, int size, int sdu_id),
-    void *deliver_pdu_data)
 {
-  abort();
+  unsigned char    *buffer = (unsigned char *)_buffer;
+  nr_pdcp_sdu_t    *sdu;
+  int              rcvd_sn;
+  uint32_t         rcvd_hfn;
+  uint32_t         rcvd_count;
+  int              header_size;
+  int              integrity_size;
+  int              rx_deliv_sn;
+  uint32_t         rx_deliv_hfn;
+
+  if (size < 1) {
+    LOG_E(PDCP, "bad PDU received (size = %d)\n", size);
+    return;
+  }
+
+  if (!(buffer[0] & 0x80)) {
+    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
+    exit(1);
+  }
+
+  if (entity->sn_size == 12) {
+    rcvd_sn = (((unsigned char)buffer[0] & 0xf) <<  8) |
+                (unsigned char)buffer[1];
+    header_size = 2;
+  } else {
+    rcvd_sn = (((unsigned char)buffer[0] & 0x3) << 16) |
+               ((unsigned char)buffer[1]        <<  8) |
+                (unsigned char)buffer[2];
+    header_size = 3;
+  }
+
+  integrity_size = 0;
+
+  if (size < header_size + integrity_size + 1) {
+    LOG_E(PDCP, "bad PDU received (size = %d)\n", size);
+    return;
+  }
+
+  rx_deliv_sn  = entity->rx_deliv & entity->sn_max;
+  rx_deliv_hfn = (entity->rx_deliv >> entity->sn_size) & ~entity->sn_max;
+
+  if (rcvd_sn < rx_deliv_sn - entity->window_size) {
+    rcvd_hfn = rx_deliv_hfn + 1;
+  } else if (rcvd_sn >= rx_deliv_sn + entity->window_size) {
+    rcvd_hfn = rx_deliv_hfn - 1;
+  } else {
+    rcvd_hfn = rx_deliv_hfn;
+  }
+
+  rcvd_count = (rcvd_hfn << entity->sn_size) | rcvd_sn;
+
+  if (entity->has_ciphering)
+    entity->cipher(entity->security_context,
+                   (unsigned char *)buffer+header_size, size-header_size,
+                   entity->rb_id, rcvd_count, entity->is_gnb ? 0 : 1);
+
+  if (rcvd_count < entity->rx_deliv
+      || nr_pdcp_sdu_in_list(entity->rx_list, rcvd_count)) {
+    LOG_D(PDCP, "discard NR PDU rcvd_count=%d\n", rcvd_count);
+    return;
+  }
+
+  sdu = nr_pdcp_new_sdu(rcvd_count,
+                        (char *)buffer + header_size,
+                        size - header_size - integrity_size);
+  entity->rx_list = nr_pdcp_sdu_list_add(entity->rx_list, sdu);
+  entity->rx_size += size-header_size;
+
+  if (rcvd_count >= entity->rx_next) {
+    entity->rx_next = rcvd_count + 1;
+  }
+
+  /* TODO(?): out of order delivery */
+
+  if (rcvd_count == entity->rx_deliv) {
+    /* deliver all SDUs starting from rx_deliv up to discontinuity or end of list */
+    uint32_t count = entity->rx_deliv;
+    while (entity->rx_list != NULL && count == entity->rx_list->count) {
+      nr_pdcp_sdu_t *cur = entity->rx_list;
+      entity->deliver_sdu(entity->deliver_sdu_data, entity,
+                          cur->buffer, cur->size);
+      entity->rx_list = cur->next;
+      entity->rx_size -= cur->size;
+      nr_pdcp_free_sdu(cur);
+      count++;
+    }
+    entity->rx_deliv = count;
+  }
+
+  if (entity->t_reordering_start != 0 && entity->rx_deliv > entity->rx_reord) {
+    /* stop and reset t-Reordering */
+    entity->t_reordering_start = 0;
+  }
+
+  if (entity->t_reordering_start == 0 && entity->rx_deliv < entity->rx_next) {
+    entity->rx_reord = entity->rx_next;
+    entity->t_reordering_start = entity->t_current;
+  }
 }
 
-nr_pdcp_entity_t *new_nr_pdcp_entity_drb_am(
+static void nr_pdcp_entity_recv_sdu(nr_pdcp_entity_t *entity,
+                                    char *buffer, int size, int sdu_id)
+{
+  uint32_t count;
+  int      sn;
+  int      header_size;
+  char     buf[size+3+4];
+
+  count = entity->tx_next;
+  sn = entity->tx_next & entity->sn_max;
+
+  if (entity->sn_size == 12) {
+    buf[0] = 0x80 | ((sn >> 8) & 0xf);
+    buf[1] = sn & 0xff;
+    header_size = 2;
+  } else {
+    buf[0] = 0x80 | ((sn >> 16) & 0x3);
+    buf[1] = (sn >> 8) & 0xff;
+    buf[2] = sn & 0xff;
+    header_size = 3;
+  }
+
+  memcpy(buf+header_size, buffer, size);
+
+  if (entity->has_ciphering)
+    entity->cipher(entity->security_context,
+                   (unsigned char *)buf+header_size, size,
+                   entity->rb_id, count, entity->is_gnb ? 1 : 0);
+
+  entity->tx_next++;
+
+  entity->deliver_pdu(entity->deliver_pdu_data, entity, buf,
+                      size+header_size, sdu_id);
+}
+
+static void nr_pdcp_entity_set_integrity_key(nr_pdcp_entity_t *entity,
+                                             char *key)
+{
+  memcpy(entity->integrity_key, key, 16);
+}
+
+static void check_t_reordering(nr_pdcp_entity_t *entity)
+{
+  uint32_t count;
+
+  if (entity->t_reordering_start == 0
+      || entity->t_current <= entity->t_reordering_start + entity->t_reordering)
+    return;
+
+  /* stop timer */
+  entity->t_reordering_start = 0;
+
+  /* deliver all SDUs with count < rx_reord */
+  while (entity->rx_list != NULL && entity->rx_list->count < entity->rx_reord) {
+    nr_pdcp_sdu_t *cur = entity->rx_list;
+    entity->deliver_sdu(entity->deliver_sdu_data, entity,
+                        cur->buffer, cur->size);
+    entity->rx_list = cur->next;
+    entity->rx_size -= cur->size;
+    nr_pdcp_free_sdu(cur);
+  }
+
+  /* deliver all SDUs starting from rx_reord up to discontinuity or end of list */
+  count = entity->rx_reord;
+  while (entity->rx_list != NULL && count == entity->rx_list->count) {
+    nr_pdcp_sdu_t *cur = entity->rx_list;
+    entity->deliver_sdu(entity->deliver_sdu_data, entity,
+                        cur->buffer, cur->size);
+    entity->rx_list = cur->next;
+    entity->rx_size -= cur->size;
+    nr_pdcp_free_sdu(cur);
+    count++;
+  }
+
+  entity->rx_deliv = count;
+
+  if (entity->rx_deliv < entity->rx_next) {
+    entity->rx_reord = entity->rx_next;
+    entity->t_reordering_start = entity->t_current;
+  }
+}
+
+void nr_pdcp_entity_set_time(struct nr_pdcp_entity_t *entity, uint64_t now)
+{
+  entity->t_current = now;
+
+  check_t_reordering(entity);
+}
+
+void nr_pdcp_entity_delete(nr_pdcp_entity_t *entity)
+{
+  nr_pdcp_sdu_t *cur = entity->rx_list;
+  while (cur != NULL) {
+    nr_pdcp_sdu_t *next = cur->next;
+    nr_pdcp_free_sdu(cur);
+    cur = next;
+  }
+  if (entity->free_security != NULL)
+    entity->free_security(entity->security_context);
+  free(entity);
+}
+
+nr_pdcp_entity_t *new_nr_pdcp_entity(
+    nr_pdcp_entity_type_t type,
     int is_gnb, int rb_id,
     void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
                         char *buf, int size),
@@ -54,52 +252,56 @@ nr_pdcp_entity_t *new_nr_pdcp_entity_drb_am(
     unsigned char *ciphering_key,
     unsigned char *integrity_key)
 {
-  nr_pdcp_entity_drb_am_t *ret;
+  nr_pdcp_entity_t *ret;
 
-  ret = calloc(1, sizeof(nr_pdcp_entity_drb_am_t));
+  ret = calloc(1, sizeof(nr_pdcp_entity_t));
   if (ret == NULL) {
     LOG_E(PDCP, "%s:%d:%s: out of memory\n", __FILE__, __LINE__, __FUNCTION__);
     exit(1);
   }
 
-  ret->common.recv_pdu          = nr_pdcp_entity_drb_am_recv_pdu;
+  ret->type = type;
-  ret->common.recv_sdu          = nr_pdcp_entity_drb_am_recv_sdu;
-  ret->common.set_integrity_key = nr_pdcp_entity_drb_am_set_integrity_key;
 
-  ret->common.delete = nr_pdcp_entity_drb_am_delete;
+  ret->recv_pdu          = nr_pdcp_entity_recv_pdu;
+  ret->recv_sdu          = nr_pdcp_entity_recv_sdu;
+  ret->set_integrity_key = nr_pdcp_entity_set_integrity_key;
+  ret->set_time          = nr_pdcp_entity_set_time;
 
-  ret->common.deliver_sdu = deliver_sdu;
+  ret->delete = nr_pdcp_entity_delete;
-  ret->common.deliver_sdu_data = deliver_sdu_data;
 
-  ret->common.deliver_pdu = deliver_pdu;
+  ret->deliver_sdu = deliver_sdu;
-  ret->common.deliver_pdu_data = deliver_pdu_data;
+  ret->deliver_sdu_data = deliver_sdu_data;
+
+  ret->deliver_pdu = deliver_pdu;
+  ret->deliver_pdu_data = deliver_pdu_data;
 
   ret->rb_id         = rb_id;
   ret->sn_size       = sn_size;
   ret->t_reordering  = t_reordering;
   ret->discard_timer = discard_timer;
 
-  ret->common.maximum_nr_pdcp_sn = (1 << sn_size) - 1;
+  ret->sn_max        = (1 << sn_size) - 1;
+  ret->window_size   = 1 << (sn_size - 1);
 
   if (ciphering_key != NULL && ciphering_algorithm != 0) {
     if (ciphering_algorithm != 2) {
       LOG_E(PDCP, "FATAL: only nea2 supported for the moment\n");
       exit(1);
     }
-    ret->common.has_ciphering = 1;
+    ret->has_ciphering = 1;
-    ret->common.ciphering_algorithm = ciphering_algorithm;
+    ret->ciphering_algorithm = ciphering_algorithm;
-    memcpy(ret->common.ciphering_key, ciphering_key, 16);
+    memcpy(ret->ciphering_key, ciphering_key, 16);
 
-    ret->common.security_context = nr_pdcp_security_nea2_init(ciphering_key);
+    ret->security_context = nr_pdcp_security_nea2_init(ciphering_key);
-    ret->common.cipher = nr_pdcp_security_nea2_cipher;
+    ret->cipher = nr_pdcp_security_nea2_cipher;
-    ret->common.free_security = nr_pdcp_security_nea2_free_security;
+    ret->free_security = nr_pdcp_security_nea2_free_security;
   }
-  ret->common.is_gnb = is_gnb;
+  ret->is_gnb = is_gnb;
 
   if (integrity_key != NULL) {
     printf("%s:%d:%s: TODO\n", __FILE__, __LINE__, __FUNCTION__);
     exit(1);
   }
 
-  return (nr_pdcp_entity_t *)ret;
+  return ret;
 }

openair2/LAYER2/nr_pdcp/nr_pdcp_entity.h

@@ -19,18 +19,29 @@
  *      contact@openairinterface.org
  */
 
-#include <stdint.h>
-
 #ifndef _NR_PDCP_ENTITY_H_
 #define _NR_PDCP_ENTITY_H_
 
+#include <stdint.h>
+
+#include "nr_pdcp_sdu.h"
+
+typedef enum {
+  NR_PDCP_DRB_AM,
+  NR_PDCP_DRB_UM,
+  NR_PDCP_SRB
+} nr_pdcp_entity_type_t;
+
 typedef struct nr_pdcp_entity_t {
+  nr_pdcp_entity_type_t type;
+
   /* functions provided by the PDCP module */
   void (*recv_pdu)(struct nr_pdcp_entity_t *entity, char *buffer, int size);
   void (*recv_sdu)(struct nr_pdcp_entity_t *entity, char *buffer, int size,
                    int sdu_id);
   void (*delete)(struct nr_pdcp_entity_t *entity);
   void (*set_integrity_key)(struct nr_pdcp_entity_t *entity, char *key);
+  void (*set_time)(struct nr_pdcp_entity_t *entity, uint64_t now);
 
   /* callbacks provided to the PDCP module */
   void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
@@ -39,9 +50,28 @@ typedef struct nr_pdcp_entity_t {
   void (*deliver_pdu)(void *deliver_pdu_data, struct nr_pdcp_entity_t *entity,
                       char *buf, int size, int sdu_id);
   void *deliver_pdu_data;
-  int tx_hfn;
+
-  int next_nr_pdcp_tx_sn;
+  /* configuration variables */
-  int maximum_nr_pdcp_sn;
+  int rb_id;
+
+  int sn_size;                  /* SN size, in bits */
+  int t_reordering;             /* unit: ms */
+  int discard_timer;            /* unit: ms */
+
+  int sn_max;                   /* (2^SN_size) - 1 */
+  int window_size;              /* 2^(SN_size - 1) */
+
+  /* state variables */
+  uint32_t tx_next;
+  uint32_t rx_next;
+  uint32_t rx_deliv;
+  uint32_t rx_reord;
+
+  /* set to the latest know time by the user of the module. Unit: ms */
+  uint64_t t_current;
+
+  /* timers (stores the ms of activation, 0 means not active) */
+  int t_reordering_start;
 
   /* security */
   int has_ciphering;
@@ -60,18 +90,15 @@ typedef struct nr_pdcp_entity_t {
    * pdcp entity is for a gnb or an ue
    */
   int is_gnb;
+
+  /* rx management */
+  nr_pdcp_sdu_t *rx_list;
+  int           rx_size;
+  int           rx_maxsize;
 } nr_pdcp_entity_t;
 
-nr_pdcp_entity_t *new_nr_pdcp_entity_srb(
+nr_pdcp_entity_t *new_nr_pdcp_entity(
-    int is_gnb, int rb_id,
+    nr_pdcp_entity_type_t type,
-    void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
-                        char *buf, int size),
-    void *deliver_sdu_data,
-    void (*deliver_pdu)(void *deliver_pdu_data, struct nr_pdcp_entity_t *entity,
-                        char *buf, int size, int sdu_id),
-    void *deliver_pdu_data);
-
-nr_pdcp_entity_t *new_nr_pdcp_entity_drb_am(
     int is_gnb, int rb_id,
     void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
                         char *buf, int size),

openair2/LAYER2/nr_pdcp/nr_pdcp_entity_drb_am.c

@@ -1,90 +0,0 @@
-/*
- * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The OpenAirInterface Software Alliance licenses this file to You under
- * the OAI Public License, Version 1.1  (the "License"); you may not use this file
- * except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.openairinterface.org/?page_id=698
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *-------------------------------------------------------------------------------
- * For more information about the OpenAirInterface (OAI) Software Alliance:
- *      contact@openairinterface.org
- */
-
-#include "nr_pdcp_entity_drb_am.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "common/utils/LOG/log.h"
-
-void nr_pdcp_entity_drb_am_recv_pdu(nr_pdcp_entity_t *_entity, char *buffer, int size)
-{
-  nr_pdcp_entity_drb_am_t *entity = (nr_pdcp_entity_drb_am_t *)_entity;
-  int sn;
-
-  if (size < 3) abort();
-
-  if (!(buffer[0] & 0x80))
-    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
-
-  sn = (((unsigned char)buffer[0] & 0x3) << 16) |
-        ((unsigned char)buffer[1]        <<  8) |
-         (unsigned char)buffer[2];
-
-  if (entity->common.has_ciphering)
-    entity->common.cipher(entity->common.security_context, (unsigned char *)buffer+3, size-3,
-                          entity->rb_id, sn, entity->common.is_gnb ? 0 : 1);
-
-  entity->common.deliver_sdu(entity->common.deliver_sdu_data,
-                             (nr_pdcp_entity_t *)entity, buffer+3, size-3);
-}
-
-void nr_pdcp_entity_drb_am_recv_sdu(nr_pdcp_entity_t *_entity, char *buffer, int size,
-                              int sdu_id)
-{
-  nr_pdcp_entity_drb_am_t *entity = (nr_pdcp_entity_drb_am_t *)_entity;
-  int sn;
-  char buf[size+3];
-
-  sn = entity->common.next_nr_pdcp_tx_sn;
-
-  entity->common.next_nr_pdcp_tx_sn++;
-  if (entity->common.next_nr_pdcp_tx_sn > entity->common.maximum_nr_pdcp_sn) {
-    entity->common.next_nr_pdcp_tx_sn = 0;
-    entity->common.tx_hfn++;
-  }
-
-  buf[0] = 0x80 | ((sn >> 16) & 0x3);
-  buf[1] = (sn >> 8) & 0xff;
-  buf[2] = sn & 0xff;
-  memcpy(buf+3, buffer, size);
-
-  if (entity->common.has_ciphering)
-    entity->common.cipher(entity->common.security_context, (unsigned char *)buf+3, size,
-                          entity->rb_id, sn, entity->common.is_gnb ? 1 : 0);
-
-  entity->common.deliver_pdu(entity->common.deliver_pdu_data,
-                             (nr_pdcp_entity_t *)entity, buf, size+3, sdu_id);
-}
-
-void nr_pdcp_entity_drb_am_set_integrity_key(nr_pdcp_entity_t *_entity, char *key)
-{
-  /* nothing to do */
-}
-
-void nr_pdcp_entity_drb_am_delete(nr_pdcp_entity_t *_entity)
-{
-  nr_pdcp_entity_drb_am_t *entity = (nr_pdcp_entity_drb_am_t *)_entity;
-  if (entity->common.free_security != NULL)
-    entity->common.free_security(entity->common.security_context);
-  free(entity);
-}

openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c

@@ -24,6 +24,7 @@
 #endif
 #include "asn1_utils.h"
 #include "nr_pdcp_ue_manager.h"
+#include "nr_pdcp_timer_thread.h"
 #include "NR_RadioBearerConfig.h"
 #include "NR_RLC-BearerConfig.h"
 #include "NR_RLC-Config.h"
@@ -41,6 +42,11 @@
 
 static nr_pdcp_ue_manager_t *nr_pdcp_ue_manager;
 
+/* TODO: handle time a bit more properly */
+static uint64_t nr_pdcp_current_time;
+static int      nr_pdcp_current_time_last_frame;
+static int      nr_pdcp_current_time_last_subframe;
+
 /* necessary globals for OAI, not used internally */
 hash_table_t  *pdcp_coll_p;
 static uint64_t pdcp_optmask;
@@ -339,6 +345,8 @@ void pdcp_layer_init(void)
 
   nr_pdcp_ue_manager = new_nr_pdcp_ue_manager(1);
   init_nr_rlc_data_req_queue();
+
+  nr_pdcp_init_timer_thread(nr_pdcp_ue_manager);
 }
 
 #include "nfapi/oai_integration/vendor_ext.h"
@@ -625,11 +633,11 @@ static void add_drb_am(int is_gnb, int rnti, struct NR_DRB_ToAddMod *s,
     LOG_D(PDCP, "%s:%d:%s: warning DRB %d already exist for ue %d, do nothing\n",
           __FILE__, __LINE__, __FUNCTION__, drb_id, rnti);
   } else {
-    pdcp_drb = new_nr_pdcp_entity_drb_am(is_gnb, drb_id,
+    pdcp_drb = new_nr_pdcp_entity(NR_PDCP_DRB_AM, is_gnb, drb_id,
-                                         deliver_sdu_drb, ue, deliver_pdu_drb, ue,
+                                  deliver_sdu_drb, ue, deliver_pdu_drb, ue,
-                                         sn_size_dl, t_reordering, discard_timer,
+                                  sn_size_dl, t_reordering, discard_timer,
-                                         ciphering_algorithm, integrity_algorithm,
+                                  ciphering_algorithm, integrity_algorithm,
-                                         ciphering_key, integrity_key);
+                                  ciphering_key, integrity_key);
     nr_pdcp_ue_add_drb_pdcp_entity(ue, drb_id, pdcp_drb);
 
     LOG_D(PDCP, "%s:%d:%s: added drb %d to ue rnti %x\n", __FILE__, __LINE__, __FUNCTION__, drb_id, rnti);
@@ -976,3 +984,14 @@ void
 pdcp_mbms_run ( const protocol_ctxt_t *const  ctxt_pP){
   /* nothing to do */
 }
+
+void nr_pdcp_tick(int frame, int subframe)
+{
+  if (frame != nr_pdcp_current_time_last_frame ||
+      subframe != nr_pdcp_current_time_last_subframe) {
+    nr_pdcp_current_time_last_frame = frame;
+    nr_pdcp_current_time_last_subframe = subframe;
+    nr_pdcp_current_time++;
+    nr_pdcp_wakeup_timer_thread(nr_pdcp_current_time);
+  }
+}

openair2/LAYER2/nr_pdcp/nr_pdcp_sdu.c

@@ -0,0 +1,78 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include "nr_pdcp_sdu.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+nr_pdcp_sdu_t *nr_pdcp_new_sdu(uint32_t count, char *buffer, int size)
+{
+  nr_pdcp_sdu_t *ret = calloc(1, sizeof(nr_pdcp_sdu_t));
+  if (ret == NULL)
+    exit(1);
+  ret->count = count;
+  ret->buffer = malloc(size);
+  if (ret->buffer == NULL)
+    exit(1);
+  memcpy(ret->buffer, buffer, size);
+  ret->size = size;
+  return ret;
+}
+
+nr_pdcp_sdu_t *nr_pdcp_sdu_list_add(nr_pdcp_sdu_t *l, nr_pdcp_sdu_t *sdu)
+{
+  nr_pdcp_sdu_t head;
+  nr_pdcp_sdu_t *cur;
+  nr_pdcp_sdu_t *prev;
+
+  head.next = l;
+  cur = l;
+  prev = &head;
+
+  /* order is by 'count' */
+  while (cur != NULL) {
+    /* check if 'sdu' is before 'cur' in the list */
+    if (sdu->count < cur->count)
+      break;
+    prev = cur;
+    cur = cur->next;
+  }
+  prev->next = sdu;
+  sdu->next = cur;
+  return head.next;
+}
+
+int nr_pdcp_sdu_in_list(nr_pdcp_sdu_t *l, uint32_t count)
+{
+  while (l != NULL) {
+    if (l->count == count)
+      return 1;
+    l = l->next;
+  }
+  return 0;
+}
+
+void nr_pdcp_free_sdu(nr_pdcp_sdu_t *sdu)
+{
+  free(sdu->buffer);
+  free(sdu);
+}

openair2/LAYER2/nr_pdcp/nr_pdcp_sdu.h

@@ -19,23 +19,21 @@
  *      contact@openairinterface.org
  */
 
-#ifndef _NR_PDCP_ENTITY_DRB_AM_H_
+#ifndef _NR_PDCP_SDU_H_
-#define _NR_PDCP_ENTITY_DRB_AM_H_
+#define _NR_PDCP_SDU_H_
 
-#include "nr_pdcp_entity.h"
+#include <stdint.h>
 
-typedef struct {
+typedef struct nr_pdcp_sdu_t {
-  nr_pdcp_entity_t common;
+  uint32_t             count;
-  int rb_id;
+  char                 *buffer;
-  int sn_size;               /* unit: bits */
+  int                  size;
-  int t_reordering;          /* unit: ms */
+  struct nr_pdcp_sdu_t *next;
-  int discard_timer;         /* unit: ms, -1 means infinity */
+} nr_pdcp_sdu_t;
-} nr_pdcp_entity_drb_am_t;
 
-void nr_pdcp_entity_drb_am_recv_pdu(nr_pdcp_entity_t *entity, char *buffer, int size);
+nr_pdcp_sdu_t *nr_pdcp_new_sdu(uint32_t count, char *buffer, int size);
-void nr_pdcp_entity_drb_am_recv_sdu(nr_pdcp_entity_t *entity, char *buffer, int size,
+nr_pdcp_sdu_t *nr_pdcp_sdu_list_add(nr_pdcp_sdu_t *l, nr_pdcp_sdu_t *sdu);
-                                    int sdu_id);
+int nr_pdcp_sdu_in_list(nr_pdcp_sdu_t *l, uint32_t count);
-void nr_pdcp_entity_drb_am_set_integrity_key(nr_pdcp_entity_t *entity, char *key);
+void nr_pdcp_free_sdu(nr_pdcp_sdu_t *sdu);
-void nr_pdcp_entity_drb_am_delete(nr_pdcp_entity_t *entity);
 
-#endif /* _NR_PDCP_ENTITY_DRB_AM_H_ */
+#endif /* _NR_PDCP_SDU_H_ */

openair2/LAYER2/nr_pdcp/nr_pdcp_timer_thread.c

@@ -0,0 +1,87 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include "nr_pdcp_timer_thread.h"
+
+#include <stdlib.h>
+#include <pthread.h>
+#include <stdint.h>
+
+#include "LOG/log.h"
+
+static pthread_mutex_t   timer_thread_mutex   = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t    timer_thread_cond    = PTHREAD_COND_INITIALIZER;
+static volatile uint64_t timer_thread_curtime = 0;
+
+static void *nr_pdcp_timer_thread(void *_nr_pdcp_ue_manager)
+{
+  nr_pdcp_ue_manager_t *nr_pdcp_ue_manager = (nr_pdcp_ue_manager_t *)_nr_pdcp_ue_manager;
+  nr_pdcp_ue_t         **ue_list;
+  int                  ue_count;
+  int                  i;
+  int                  j;
+  uint64_t             curtime = 0;
+
+  while (1) {
+    if (pthread_mutex_lock(&timer_thread_mutex) != 0) abort();
+    while (curtime == timer_thread_curtime)
+      if (pthread_cond_wait(&timer_thread_cond, &timer_thread_mutex) != 0) abort();
+    curtime = timer_thread_curtime;
+    if (pthread_mutex_unlock(&timer_thread_mutex) != 0) abort();
+
+    nr_pdcp_manager_lock(nr_pdcp_ue_manager);
+
+    ue_list  = nr_pdcp_manager_get_ue_list(nr_pdcp_ue_manager);
+    ue_count = nr_pdcp_manager_get_ue_count(nr_pdcp_ue_manager);
+    for (i = 0; i < ue_count; i++) {
+      for (j = 0; j < 2; j++) {
+        if (ue_list[i]->srb[j] != NULL)
+          ue_list[i]->srb[j]->set_time(ue_list[i]->srb[j], curtime);
+      }
+      for (j = 0; j < 5; j++) {
+        if (ue_list[i]->drb[j] != NULL)
+          ue_list[i]->drb[j]->set_time(ue_list[i]->drb[j], curtime);
+      }
+    }
+
+    nr_pdcp_manager_unlock(nr_pdcp_ue_manager);
+  }
+
+  return NULL;
+}
+
+void nr_pdcp_init_timer_thread(nr_pdcp_ue_manager_t *nr_pdcp_ue_manager)
+{
+  pthread_t t;
+
+  if (pthread_create(&t, NULL, nr_pdcp_timer_thread, nr_pdcp_ue_manager) != 0) {
+    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
+    exit(1);
+  }
+}
+
+void nr_pdcp_wakeup_timer_thread(uint64_t time)
+{
+  if (pthread_mutex_lock(&timer_thread_mutex)) abort();
+  timer_thread_curtime = time;
+  if (pthread_cond_broadcast(&timer_thread_cond)) abort();
+  if (pthread_mutex_unlock(&timer_thread_mutex)) abort();
+}

openair2/LAYER2/nr_pdcp/nr_pdcp_timer_thread.h

@@ -0,0 +1,32 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef _NR_PDCP_TIMER_THREAD_H_
+#define _NR_PDCP_TIMER_THREAD_H_
+
+#include "nr_pdcp_ue_manager.h"
+
+#include <stdint.h>
+
+void nr_pdcp_init_timer_thread(nr_pdcp_ue_manager_t *nr_pdcp_ue_manager);
+void nr_pdcp_wakeup_timer_thread(uint64_t time);
+
+#endif /* _NR_PDCP_TIMER_THREAD_H_ */

openair2/LAYER2/nr_pdcp/nr_pdcp_ue_manager.c

@@ -189,6 +189,20 @@ void nr_pdcp_ue_add_drb_pdcp_entity(nr_pdcp_ue_t *ue, int drb_id, nr_pdcp_entity
   ue->drb[drb_id] = entity;
 }
 
+/* must be called with lock acquired */
+nr_pdcp_ue_t **nr_pdcp_manager_get_ue_list(nr_pdcp_ue_manager_t *_m)
+{
+  nr_pdcp_ue_manager_internal_t *m = _m;
+  return m->ue_list;
+}
+
+/* must be called with lock acquired */
+int nr_pdcp_manager_get_ue_count(nr_pdcp_ue_manager_t *_m)
+{
+  nr_pdcp_ue_manager_internal_t *m = _m;
+  return m->ue_count;
+}
+
 int nr_pdcp_get_first_rnti(nr_pdcp_ue_manager_t *_m)
 {
   nr_pdcp_ue_manager_internal_t *m = _m;

openair2/LAYER2/nr_pdcp/nr_pdcp_ue_manager.h

@@ -46,6 +46,9 @@ void nr_pdcp_manager_unlock(nr_pdcp_ue_manager_t *m);
 nr_pdcp_ue_t *nr_pdcp_manager_get_ue(nr_pdcp_ue_manager_t *m, int rnti);
 void nr_pdcp_manager_remove_ue(nr_pdcp_ue_manager_t *m, int rnti);
 
+nr_pdcp_ue_t **nr_pdcp_manager_get_ue_list(nr_pdcp_ue_manager_t *_m);
+int nr_pdcp_manager_get_ue_count(nr_pdcp_ue_manager_t *_m);
+
 /***********************************************************************/
 /* ue functions                                                        */
 /***********************************************************************/