FlexRAN: New protobuf slice structure + Static Slice handling

openair2/ENB_APP/CONTROL_MODULES/MAC/flexran_agent_mac.c

@@ -1452,9 +1452,74 @@ void flexran_agent_fill_mac_cell_config(mid_t mod_id, uint8_t cc_id,
     conf->si_config->has_sfn = 1;
   }
 
-  /* get a pointer to the config which is maintained in the agent throughout
-  * its lifetime */
-  conf->slice_config = flexran_agent_get_slice_config(mod_id);
+  conf->slice_config = malloc(sizeof(Protocol__FlexSliceConfig));
+  if (conf->slice_config) {
+    protocol__flex_slice_config__init(conf->slice_config);
+    Protocol__FlexSliceConfig *sc = conf->slice_config;
+
+    sc->dl = malloc(sizeof(Protocol__FlexSliceDlUlConfig));
+    DevAssert(sc->dl);
+    protocol__flex_slice_dl_ul_config__init(sc->dl);
+    sc->dl->algorithm = flexran_get_dl_slice_algo(mod_id);
+    sc->dl->has_algorithm = 1;
+    sc->dl->n_slices = flexran_get_num_dl_slices(mod_id);
+    if (sc->dl->n_slices > 0) {
+      sc->dl->slices = calloc(sc->dl->n_slices, sizeof(Protocol__FlexSlice *));
+      DevAssert(sc->dl->slices);
+      for (int i = 0; i < sc->dl->n_slices; ++i) {
+        sc->dl->slices[i] = malloc(sizeof(Protocol__FlexSlice));
+        DevAssert(sc->dl->slices[i]);
+        protocol__flex_slice__init(sc->dl->slices[i]);
+        flexran_get_dl_slice(mod_id, i, sc->dl->slices[i], sc->dl->algorithm);
+      }
+    } else {
+      sc->dl->scheduler = flexran_get_dl_scheduler_name(mod_id);
+    }
+
+    sc->ul = malloc(sizeof(Protocol__FlexSliceDlUlConfig));
+    DevAssert(sc->ul);
+    protocol__flex_slice_dl_ul_config__init(sc->ul);
+    sc->ul->algorithm = flexran_get_ul_slice_algo(mod_id);
+    sc->ul->has_algorithm = 1;
+    sc->ul->n_slices = flexran_get_num_ul_slices(mod_id);
+    if (sc->ul->n_slices > 0) {
+      sc->ul->slices = calloc(sc->ul->n_slices, sizeof(Protocol__FlexSlice *));
+      DevAssert(sc->ul->slices);
+      for (int i = 0; i < sc->ul->n_slices; ++i) {
+        sc->ul->slices[i] = malloc(sizeof(Protocol__FlexSlice));
+        DevAssert(sc->ul->slices[i]);
+        protocol__flex_slice__init(sc->ul->slices[i]);
+        flexran_get_ul_slice(mod_id, i, sc->ul->slices[i], sc->ul->algorithm);
+      }
+    } else {
+      sc->ul->scheduler = flexran_get_ul_scheduler_name(mod_id);
+    }
+  }
+}
+
+void flexran_agent_destroy_mac_slice_config(Protocol__FlexCellConfig *conf) {
+  Protocol__FlexSliceConfig *sc = conf->slice_config;
+  for (int i = 0; i < sc->dl->n_slices; ++i) {
+    free(sc->dl->slices[i]);
+    sc->dl->slices[i] = NULL;
+    /* scheduler names are not freed: we assume we read them directly from the
+     * underlying memory and do not dispose it */
+  }
+  free(sc->dl->slices);
+  /* scheduler name is not freed */
+  free(sc->dl);
+  sc->dl = NULL;
+  for (int i = 0; i < sc->ul->n_slices; ++i) {
+    free(sc->ul->slices[i]);
+    sc->ul->slices[i] = NULL;
+    /* scheduler names are not freed */
+  }
+  free(sc->ul->slices);
+  /* scheduler name is not freed */
+  free(sc->ul);
+  sc->ul = NULL;
+  free(conf->slice_config);
+  conf->slice_config = NULL;
 }
 
 void flexran_agent_fill_mac_ue_config(mid_t mod_id, mid_t ue_id,
@@ -1568,46 +1633,46 @@ int flexran_agent_unregister_mac_xface(mid_t mod_id)
   return 0;
 }
 
-
-void flexran_create_config_structures(mid_t mod_id)
-{
-  int i;
-  int n_dl = flexran_get_num_dl_slices(mod_id);
-  int m_ul = flexran_get_num_ul_slices(mod_id);
-  slice_config[mod_id] = flexran_agent_create_slice_config(n_dl, m_ul);
-  sc_update[mod_id] = flexran_agent_create_slice_config(n_dl, m_ul);
-  if (!slice_config[mod_id] || !sc_update[mod_id]) return;
-
-  //flexran_agent_read_slice_config(mod_id, slice_config[mod_id]);
-  //flexran_agent_read_slice_config(mod_id, sc_update[mod_id]);
-  for (i = 0; i < n_dl; i++) {
-    //flexran_agent_read_slice_dl_config(mod_id, i, slice_config[mod_id]->dl[i]);
-    //flexran_agent_read_slice_dl_config(mod_id, i, sc_update[mod_id]->dl[i]);
-  }
-  for (i = 0; i < m_ul; i++) {
-    //flexran_agent_read_slice_ul_config(mod_id, i, slice_config[mod_id]->ul[i]);
-    //flexran_agent_read_slice_ul_config(mod_id, i, sc_update[mod_id]->ul[i]);
-  }
+void helper_destroy_mac_slice_config(Protocol__FlexSliceConfig *slice_config) {
+  if (slice_config->dl) {
+    if (slice_config->dl->scheduler)
+      free(slice_config->dl->scheduler);
+    for (int i = 0; i < slice_config->dl->n_slices; i++)
+      if (slice_config->dl->slices[i]->scheduler)
+        free(slice_config->dl->slices[i]->scheduler);
+  }
+  if (slice_config->ul) {
+    if (slice_config->ul->scheduler)
+      free(slice_config->ul->scheduler);
+    for (int i = 0; i < slice_config->ul->n_slices; i++)
+      if (slice_config->ul->slices[i]->scheduler)
+        free(slice_config->ul->slices[i]->scheduler);
+  }
+
+  Protocol__FlexCellConfig helper;
+  helper.slice_config = slice_config;
+  flexran_agent_destroy_mac_slice_config(&helper);
 }
 
-void flexran_check_and_remove_slices(mid_t mod_id)
-{
-}
+void prepare_update_slice_config(mid_t mod_id, Protocol__FlexSliceConfig **slice_config) {
+  if (!*slice_config) return;
+  Protocol__FlexSliceConfig *sc = *slice_config;
+  *slice_config = NULL;
 
-void flexran_agent_slice_update(mid_t mod_id)
-{
+  /* TODO handle using lock-free queue */
+  apply_update_dl_slice_config(mod_id, sc->dl);
+  apply_update_ul_slice_config(mod_id, sc->ul);
+
+  helper_destroy_mac_slice_config(*slice_config);
 }
 
-Protocol__FlexSliceConfig *flexran_agent_get_slice_config(mid_t mod_id)
-{
-  if (!slice_config[mod_id]) return NULL;
-  Protocol__FlexSliceConfig *config = NULL;
+void prepare_ue_slice_assoc_update(mid_t mod_id, Protocol__FlexUeConfig **ue_config) {
+  /* TODO handle using lock-free queue */
+  apply_ue_slice_assoc_update(mod_id, *ue_config);
 
-  pthread_mutex_lock(&sc_update_mtx);
-  if (!config) {
-    pthread_mutex_unlock(&sc_update_mtx);
-    return NULL;
-  }
-  pthread_mutex_unlock(&sc_update_mtx);
-  return config;
+  free(*ue_config);
+  *ue_config = NULL;
+}
+
+void flexran_agent_slice_update(mid_t mod_id) {
 }

openair2/ENB_APP/CONTROL_MODULES/MAC/flexran_agent_mac.h

@@ -115,7 +115,16 @@ int flexran_agent_unregister_mac_xface(mid_t mod_id);
 /* Inform controller about possibility to update slice configuration */
 void flexran_agent_slice_update(mid_t mod_id);
 
-/* return a pointer to the current config */
-Protocol__FlexSliceConfig *flexran_agent_get_slice_config(mid_t mod_id);
+/* marks slice_config so that it can be applied later. Takes ownership of the
+ * FlexSliceConfig message */
+void prepare_update_slice_config(mid_t mod_id, Protocol__FlexSliceConfig **slice);
+
+/* inserts a new ue_config into the structure keeping ue to slice association
+ * updates and marks so it can be applied. Takes ownership of the FlexUeConfig message */
+void prepare_ue_slice_assoc_update(mid_t mod_id, Protocol__FlexUeConfig **ue_config);
+
+/* free slice_config part of flexCellConfig, filled in
+ * flexran_agent_fill_mac_cell_config() */
+void flexran_agent_destroy_mac_slice_config(Protocol__FlexCellConfig *conf);
 
 #endif

openair2/ENB_APP/CONTROL_MODULES/MAC/flexran_agent_mac_internal.c

@@ -1025,60 +1025,166 @@ int load_dl_scheduler_function(mid_t mod_id, const char *function_name) {
   
 }
 
-Protocol__FlexSliceConfig *flexran_agent_create_slice_config(int n_dl, int m_ul)
-{
-  Protocol__FlexSliceConfig *fsc = malloc(sizeof(Protocol__FlexSliceConfig));
-  if (!fsc) return NULL;
-  protocol__flex_slice_config__init(fsc);
-
-  /* TODO */
-  return fsc;
+void update_or_remove_dl(mid_t mod_id, Protocol__FlexSlice *s) {
+  if (s->params_case == PROTOCOL__FLEX_SLICE__PARAMS__NOT_SET
+      && !s->label && !s->scheduler) {
+    LOG_I(FLEXRAN_AGENT, "remove DL slice ID %d\n", s->id);
+    const int rc = flexran_remove_dl_slice(mod_id, s);
+    if (!rc)
+      LOG_W(FLEXRAN_AGENT, "error while removing slice ID %d\n", s->id);
+  } else {
+    LOG_I(FLEXRAN_AGENT, "updating DL slice ID %d\n", s->id);
+    const int rc = flexran_create_dl_slice(mod_id, s);
+    if (rc < 0)
+      LOG_W(FLEXRAN_AGENT,
+            "error while update slice ID %d: flexran_create_dl_slice() -> %d\n",
+            s->id, rc);
+  }
 }
 
-void prepare_update_slice_config(mid_t mod_id, Protocol__FlexSliceConfig *sup)
-{
+void update_or_remove_ul(mid_t mod_id, Protocol__FlexSlice *s) {
+  if (s->params_case == PROTOCOL__FLEX_SLICE__PARAMS__NOT_SET
+      && !s->label && !s->scheduler) {
+    LOG_I(FLEXRAN_AGENT, "remove UL slice ID %d\n", s->id);
+    const int rc = flexran_remove_ul_slice(mod_id, s);
+    if (!rc)
+      LOG_W(FLEXRAN_AGENT, "error while removing slice ID %d\n", s->id);
+  } else {
+    LOG_I(FLEXRAN_AGENT, "updating UL slice ID %d\n", s->id);
+    const int rc = flexran_create_ul_slice(mod_id, s);
+    if (rc < 0)
+      LOG_W(FLEXRAN_AGENT,
+            "error while updating slice ID %d: flexran_create_ul_slice() -> %d)\n",
+            s->id, rc);
+  }
 }
 
+void apply_update_dl_slice_config(mid_t mod_id, Protocol__FlexSliceDlUlConfig *dl) {
+  if (!dl)
+    return;
 
-void prepare_ue_slice_assoc_update(mid_t mod_id, Protocol__FlexUeConfig *ue_config)
-{
-  if (n_ue_slice_assoc_updates == 10) {
+  Protocol__FlexSliceAlgorithm dl_algo = flexran_get_dl_slice_algo(mod_id);
+  if (dl->has_algorithm && dl_algo != dl->algorithm) {
+    LOG_I(FLEXRAN_AGENT, "loading new DL slice algorithm %d\n", dl->algorithm);
+    dl_algo = dl->algorithm;
+    flexran_set_dl_slice_algo(mod_id, dl_algo);
+  }
+
+  /* first update existing slices, then create new. Thus, we go through the
+   * list twice. First round, if a slice exists, handle and mark as such. Then,
+   * apply all others in the second round */
+  if (dl->n_slices > 0) {
+    if (dl_algo == PROTOCOL__FLEX_SLICE_ALGORITHM__None) {
+      LOG_E(FLEXRAN_AGENT, "cannot update slices: no algorithm loaded\n");
+      return;
+    }
+    int handled_dl[dl->n_slices];
+    for (int i = 0; i < dl->n_slices; ++i) {
+      if (flexran_find_dl_slice(mod_id, dl->slices[i]->id) < 0) {
+        handled_dl[i] = 0;
+        continue;
+      }
+      update_or_remove_dl(mod_id, dl->slices[i]);
+      handled_dl[i] = 1;
+    }
+    for (int i = 0; i < dl->n_slices; ++i) {
+      if (handled_dl[i])
+        continue;
+      update_or_remove_dl(mod_id, dl->slices[i]);
+    }
+  }
+
+  if (dl->scheduler) {
+    if (dl_algo != PROTOCOL__FLEX_SLICE_ALGORITHM__None) {
+      LOG_E(FLEXRAN_AGENT, "cannot update scheduling algorithm: slice algorithm loaded\n");
+      return;
+    }
+    LOG_I(FLEXRAN_AGENT, "loading DL new scheduling algorithm '%s'\n", dl->scheduler);
+    const int rc = flexran_set_dl_scheduler(mod_id, dl->scheduler);
+    if (rc < 0) {
       LOG_E(FLEXRAN_AGENT,
-          "[%d] can not handle flex_ue_config message, buffer is full; try again later\n",
-          mod_id);
+            "error while updating scheduling algorithm: "
+            "flexran_update_dl_sched_algo() -> %d)\n",
+            rc);
       return;
     }
-  if (!ue_config->has_rnti) {
+  }
+}
+
+void apply_update_ul_slice_config(mid_t mod_id, Protocol__FlexSliceDlUlConfig *ul) {
+  if (!ul)
+    return;
+
+  Protocol__FlexSliceAlgorithm ul_algo = flexran_get_ul_slice_algo(mod_id);
+  if (ul->has_algorithm && ul_algo != ul->algorithm) {
+    LOG_I(FLEXRAN_AGENT, "loading new UL slice algorithm %d\n", ul->algorithm);
+    ul_algo = ul->algorithm;
+    flexran_set_ul_slice_algo(mod_id, ul_algo);
+  }
+  if (ul->n_slices > 0) {
+    if (ul_algo == PROTOCOL__FLEX_SLICE_ALGORITHM__None) {
+      LOG_E(FLEXRAN_AGENT, "cannot update slices: no algorithm loaded\n");
+      return;
+    }
+    int handled_ul[ul->n_slices];
+    for (int i = 0; i < ul->n_slices; ++i) {
+      if (flexran_find_ul_slice(mod_id, ul->slices[i]->id) < 0) {
+        handled_ul[i] = 0;
+        continue;
+      }
+      update_or_remove_ul(mod_id, ul->slices[i]);
+      handled_ul[i] = 1;
+    }
+    for (int i = 0; i < ul->n_slices; ++i) {
+      if (handled_ul[i])
+        continue;
+      update_or_remove_ul(mod_id, ul->slices[i]);
+    }
+  }
+
+  if (ul->scheduler) {
+    if (ul_algo != PROTOCOL__FLEX_SLICE_ALGORITHM__None) {
+      LOG_E(FLEXRAN_AGENT, "cannot update scheduling algorithm: slice algorithm loaded\n");
+      return;
+    }
+    LOG_I(FLEXRAN_AGENT, "loading new UL scheduling algorithm '%s'\n", ul->scheduler);
+    const int rc = flexran_set_ul_scheduler(mod_id, ul->scheduler);
+    if (rc < 0) {
       LOG_E(FLEXRAN_AGENT,
-          "[%d] cannot update UE to slice association, no RNTI in flex_ue_config message\n",
-          mod_id);
+            "error while updating scheduling algorithm: "
+            "flexran_update_dl_sched_algo() -> %d)\n",
+            rc);
       return;
     }
-  if (ue_config->has_dl_slice_id)
-    LOG_I(FLEXRAN_AGENT, "[%d] associating UE RNTI %#x to DL slice ID %d\n",
-          mod_id, ue_config->rnti, ue_config->dl_slice_id);
-  if (ue_config->has_ul_slice_id)
-    LOG_I(FLEXRAN_AGENT, "[%d] associating UE RNTI %#x to UL slice ID %d\n",
-          mod_id, ue_config->rnti, ue_config->ul_slice_id);
-  ue_slice_assoc_update[n_ue_slice_assoc_updates++] = ue_config;
-  perform_slice_config_update_count = 2;
+  }
 }
 
-int apply_ue_slice_assoc_update(mid_t mod_id)
+int apply_ue_slice_assoc_update(mid_t mod_id, Protocol__FlexUeConfig *ue_config)
 {
-  int i;
-  int changes = 0;
-  for (i = 0; i < n_ue_slice_assoc_updates; i++) {
-    int ue_id = find_UE_id(mod_id, ue_slice_assoc_update[i]->rnti);
-    if (ue_id < 0 || ue_id > MAX_MOBILES_PER_ENB){
-      LOG_E(FLEXRAN_AGENT,"UE_id %d is wrong!!\n",ue_id);
-      continue;
+  if (!ue_config->has_rnti) {
+    LOG_E(FLEXRAN_AGENT,
+          "[%d] cannot update UE to slice association, no RNTI in flex_ue_config message\n",
+          mod_id);
+    return 0;
+  }
+  int UE_id = flexran_get_mac_ue_id_rnti(mod_id, ue_config->rnti);
+  if (ue_config->has_dl_slice_id) {
+    if (flexran_get_dl_slice_algo(mod_id) == PROTOCOL__FLEX_SLICE_ALGORITHM__None) {
+      LOG_E(FLEXRAN_AGENT, "no DL slice algorithm loaded\n");
+    } else {
+      LOG_I(FLEXRAN_AGENT, "[%d] associating UE RNTI %04x - %d/UE %d to DL slice ID %d\n",
+            mod_id, ue_config->rnti, ue_config->rnti, UE_id, ue_config->dl_slice_id);
+      flexran_set_ue_dl_slice_id(mod_id, UE_id, ue_config->dl_slice_id);
     }
-    if (ue_slice_assoc_update[i]->has_dl_slice_id) {
   }
-    if (ue_slice_assoc_update[i]->has_ul_slice_id) {
+  if (ue_config->has_ul_slice_id) {
+    if (flexran_get_ul_slice_algo(mod_id) == PROTOCOL__FLEX_SLICE_ALGORITHM__None) {
+      LOG_E(FLEXRAN_AGENT, "no UL slice algorithm loaded\n");
+    } else {
+      LOG_I(FLEXRAN_AGENT, "[%d] associating UE RNTI %04x - %d/UE %d to UL slice ID %d\n",
+            mod_id, ue_config->rnti, ue_config->rnti, UE_id, ue_config->ul_slice_id);
+      flexran_set_ue_ul_slice_id(mod_id, UE_id, ue_config->ul_slice_id);
     }
   }
-  n_ue_slice_assoc_updates = 0;
-  return changes;
+  return 0;
 }

openair2/ENB_APP/CONTROL_MODULES/MAC/flexran_agent_mac_internal.h

@@ -103,23 +103,11 @@ int load_dl_scheduler_function(mid_t mod_id, const char *function_name);
 
 /*** Functions for handling a slice config ***/
 
-/* allocate memory for a Protocol__FlexSliceConfig structure with n_dl DL slice
- * configs and m_ul UL slice configs */
-Protocol__FlexSliceConfig *flexran_agent_create_slice_config(int n_dl, int m_ul);
-
-/* read the general slice parameters via RAN into the given
- * Protocol__FlexSliceConfig struct */
-void flexran_agent_read_slice_config(mid_t mod_id, Protocol__FlexSliceConfig *s);
-
-/* reads content of slice over the sc_update structure, so that it can be
- * applied later by performing a diff between slice_config and sc_update */
-void prepare_update_slice_config(mid_t mod_id, Protocol__FlexSliceConfig *slice);
-
-/* inserts a new ue_config into the structure keeping ue to slice association
- * updates and marks so it can be applied */
-void prepare_ue_slice_assoc_update(mid_t mod_id, Protocol__FlexUeConfig *ue_config);
+/* Prepare the application of a slicing config */
+void apply_update_dl_slice_config(mid_t mod_id, Protocol__FlexSliceDlUlConfig *slice);
+void apply_update_ul_slice_config(mid_t mod_id, Protocol__FlexSliceDlUlConfig *slice);
 
 /* apply a new association between a UE and a slice (both DL and UL) */
-int apply_ue_slice_assoc_update(mid_t mod_id);
+int apply_ue_slice_assoc_update(mid_t mod_id, Protocol__FlexUeConfig *ue_config);
 
 #endif /*FLEXRAN_AGENT_MAC_INTERNAL_H_*/

openair2/ENB_APP/MESSAGES/V2/config_common.proto

@@ -61,6 +61,31 @@ enum flex_qam {
 //
 // Slice config related structures and enums
 //
+enum flex_slice_algorithm {
+  None = 0;
+  Static = 1;
+  NVS = 2;
+}
+
+message flex_slice_static {
+  optional uint32 posLow = 1;
+  optional uint32 posHigh = 2;
+}
+
+message flex_slice {
+  optional uint32 id = 1;
+  optional string label = 2;
+  optional string scheduler = 3;
+  oneof params {
+    flex_slice_static static = 10;
+  }
+}
+
+message flex_slice_dl_ul_config {
+  optional flex_slice_algorithm algorithm = 1;
+  repeated flex_slice slices = 2;
+  optional string scheduler = 3; // if no slicing
+}
 
 //
 // UE config related structures and enums

openair2/ENB_APP/MESSAGES/V2/config_messages.proto

@@ -49,6 +49,8 @@ message flex_cell_config {
 }
 
 message flex_slice_config {
+  optional flex_slice_dl_ul_config dl = 6;
+  optional flex_slice_dl_ul_config ul = 7;
 }
 
 message flex_ue_config {

openair2/ENB_APP/flexran_agent_common.c

@@ -306,6 +306,7 @@ int flexran_agent_destroy_enb_config_reply(Protocol__FlexranMessage *msg) {
     if (reply->cell_config[i]->mbsfn_subframe_config_sfalloc)
       free(reply->cell_config[i]->mbsfn_subframe_config_sfalloc);
 
+    /* si_config is shared between MAC and RRC, free here */
     if (reply->cell_config[i]->si_config) {
       for(int j = 0; j < reply->cell_config[i]->si_config->n_si_message; j++) {
         free(reply->cell_config[i]->si_config->si_message[j]);
@@ -316,8 +317,7 @@ int flexran_agent_destroy_enb_config_reply(Protocol__FlexranMessage *msg) {
     }
 
     if (reply->cell_config[i]->slice_config) {
-      /* TODO */
-      free(reply->cell_config[i]->slice_config);
+      flexran_agent_destroy_mac_slice_config(reply->cell_config[i]);
     }
 
     free(reply->cell_config[i]);
@@ -880,7 +880,7 @@ int flexran_agent_handle_enb_config_reply(mid_t mod_id, const void *params, Prot
 
   if (enb_config->n_cell_config > 0) {
     if (flexran_agent_get_mac_xface(mod_id) && enb_config->cell_config[0]->slice_config) {
-      prepare_update_slice_config(mod_id, enb_config->cell_config[0]->slice_config);
+      prepare_update_slice_config(mod_id, &enb_config->cell_config[0]->slice_config);
     }
     if (enb_config->cell_config[0]->has_eutra_band
         && enb_config->cell_config[0]->has_dl_freq
@@ -921,7 +921,11 @@ int flexran_agent_handle_ue_config_reply(mid_t mod_id, const void *params, Proto
   Protocol__FlexUeConfigReply *ue_config_reply = input->ue_config_reply_msg;
 
   for (i = 0; flexran_agent_get_mac_xface(mod_id) && i < ue_config_reply->n_ue_config; i++)
-    prepare_ue_slice_assoc_update(mod_id, ue_config_reply->ue_config[i]);
+    prepare_ue_slice_assoc_update(mod_id, &ue_config_reply->ue_config[i]);
+  /* prepare_ue_slice_assoc_update takes ownership of the individual
+   * FlexUeConfig messages. Therefore, mark zero messages to not accidentally
+   * free them twice */
+  ue_config_reply->n_ue_config = 0;
 
   *msg = NULL;
   return 0;

openair2/ENB_APP/flexran_agent_ran_api.c

@@ -30,6 +30,7 @@
 #include "flexran_agent_ran_api.h"
 #include "s1ap_eNB_ue_context.h"
 #include "s1ap_eNB_management_procedures.h"
+#include "openair2/LAYER2/MAC/slicing/slicing.h"
 
 static inline int phy_is_present(mid_t mod_id, uint8_t cc_id) {
   return RC.eNB && RC.eNB[mod_id] && RC.eNB[mod_id][cc_id];
@@ -3013,66 +3014,294 @@ uint32_t flexran_get_rrc_enb_ue_s1ap_id(mid_t mod_id, rnti_t rnti)
 }
 
 /**************************** SLICING ****************************/
+Protocol__FlexSliceAlgorithm flexran_get_dl_slice_algo(mid_t mod_id) {
+  if (!mac_is_present(mod_id)) return PROTOCOL__FLEX_SLICE_ALGORITHM__None;
+
+  switch (RC.mac[mod_id]->pre_processor_dl.algorithm) {
+    case STATIC_SLICING:
+      return PROTOCOL__FLEX_SLICE_ALGORITHM__Static;
+    default:
+      return PROTOCOL__FLEX_SLICE_ALGORITHM__None;
+  }
+}
+
+int flexran_set_dl_slice_algo(mid_t mod_id, Protocol__FlexSliceAlgorithm algo) {
+  if (!mac_is_present(mod_id)) return 0;
+  eNB_MAC_INST *mac = RC.mac[mod_id];
+  const int cc_id = 0;
+
+  pp_impl_param_t dl = mac->pre_processor_dl;
+  switch (algo) {
+    case PROTOCOL__FLEX_SLICE_ALGORITHM__Static:
+      mac->pre_processor_dl = static_dl_init(mod_id, cc_id);
+      break;
+    default:
+      mac->pre_processor_dl.algorithm = 0;
+      mac->pre_processor_dl.dl = dlsch_scheduler_pre_processor;
+      mac->pre_processor_dl.dl_algo.data = mac->pre_processor_dl.dl_algo.setup();
+      mac->pre_processor_dl.slices = NULL;
+      break;
+  }
+  if (dl.slices)
+    dl.destroy(&dl.slices);
+  if (dl.dl_algo.data)
+    dl.dl_algo.unset(&dl.dl_algo.data);
+  return 1;
+}
+
+Protocol__FlexSliceAlgorithm flexran_get_ul_slice_algo(mid_t mod_id) {
+  if (!mac_is_present(mod_id)) return PROTOCOL__FLEX_SLICE_ALGORITHM__None;
+
+  switch (RC.mac[mod_id]->pre_processor_ul.algorithm) {
+    case STATIC_SLICING:
+      return PROTOCOL__FLEX_SLICE_ALGORITHM__Static;
+    default:
+      return PROTOCOL__FLEX_SLICE_ALGORITHM__None;
+  }
+}
+
+int flexran_set_ul_slice_algo(mid_t mod_id, Protocol__FlexSliceAlgorithm algo) {
+  if (!mac_is_present(mod_id)) return 0;
+  eNB_MAC_INST *mac = RC.mac[mod_id];
+  const int cc_id = 0;
+
+  pp_impl_param_t ul = mac->pre_processor_ul;
+  switch (algo) {
+    case PROTOCOL__FLEX_SLICE_ALGORITHM__Static:
+      mac->pre_processor_ul = static_ul_init(mod_id, cc_id);
+      break;
+    default:
+      mac->pre_processor_ul.algorithm = 0;
+      mac->pre_processor_ul.ul = ulsch_scheduler_pre_processor;
+      mac->pre_processor_ul.ul_algo.data = mac->pre_processor_ul.ul_algo.setup();
+      mac->pre_processor_ul.slices = NULL;
+      break;
+  }
+  if (ul.slices)
+    ul.destroy(&ul.slices);
+  if (ul.ul_algo.data)
+    ul.ul_algo.unset(&ul.ul_algo.data);
+  return 1;
+}
+
 int flexran_get_ue_dl_slice_id(mid_t mod_id, mid_t ue_id) {
   if (!mac_is_present(mod_id)) return -1;
-  return 0;
+  slice_info_t *slices = RC.mac[mod_id]->pre_processor_dl.slices;
+  if (!slices) return -1;
+  const int idx = slices->UE_assoc_slice[ue_id];
+  return slices->s[idx]->id;
+}
+
+void flexran_set_ue_dl_slice_id(mid_t mod_id, mid_t ue_id, slice_id_t slice_id) {
+  if (!mac_is_present(mod_id)) return;
+  int idx = flexran_find_dl_slice(mod_id, slice_id);
+  if (idx < 0) return;
+  pp_impl_param_t *dl = &RC.mac[mod_id]->pre_processor_dl;
+  dl->move_UE(dl->slices, ue_id, idx);
 }
 
 int flexran_get_ue_ul_slice_id(mid_t mod_id, mid_t ue_id) {
   if (!mac_is_present(mod_id)) return -1;
-  return 0;
+  slice_info_t *slices = RC.mac[mod_id]->pre_processor_ul.slices;
+  if (!slices) return -1;
+  const int idx = slices->UE_assoc_slice[ue_id];
+  return slices->s[idx]->id;
 }
 
-/* TODO */
-int flexran_create_dl_slice(mid_t mod_id, slice_id_t slice_id) {
-  if (!mac_is_present(mod_id)) return -1;
-  return -1;
+void flexran_set_ue_ul_slice_id(mid_t mod_id, mid_t ue_id, slice_id_t slice_id) {
+  if (!mac_is_present(mod_id)) return;
+  int idx = flexran_find_ul_slice(mod_id, slice_id);
+  if (idx < 0) return;
+  pp_impl_param_t *ul = &RC.mac[mod_id]->pre_processor_ul;
+  ul->move_UE(ul->slices, ue_id, idx);
 }
 
-/* TODO */
-int flexran_remove_dl_slice(mid_t mod_id, int slice_idx) {
-  if (!mac_is_present(mod_id)) return -1;
-  return -1;
+int flexran_create_dl_slice(mid_t mod_id, const Protocol__FlexSlice *s) {
+  if (!mac_is_present(mod_id)) return 0;
+  void *params = NULL;
+  switch (s->params_case) {
+    case PROTOCOL__FLEX_SLICE__PARAMS_STATIC:
+      params = malloc(sizeof(static_slice_param_t));
+      if (!params) return 0;
+      ((static_slice_param_t *)params)->posLow = s->static_->poslow;
+      ((static_slice_param_t *)params)->posHigh = s->static_->poshigh;
+      break;
+    default:
+      break;
+  }
+  pp_impl_param_t *dl = &RC.mac[mod_id]->pre_processor_dl;
+  char *l = s->label ? strdup(s->label) : NULL;
+  void *algo = &dl->dl_algo; // default scheduler
+  if (s->scheduler) {
+    algo = dlsym(NULL, s->scheduler);
+    if (!algo) {
+      free(params);
+      LOG_E(FLEXRAN_AGENT, "cannot locate scheduler '%s'\n", s->scheduler);
+      return -15;
+    }
+  }
+  return dl->addmod_slice(dl->slices, s->id, l, algo, params);
+}
+
+int flexran_remove_dl_slice(mid_t mod_id, const Protocol__FlexSlice *s) {
+  if (!mac_is_present(mod_id)) return 0;
+  const int idx = flexran_find_dl_slice(mod_id, s->id);
+  if (idx < 0) return 0;
+  pp_impl_param_t *dl = &RC.mac[mod_id]->pre_processor_dl;
+  return dl->remove_slice(dl->slices, idx);
 }
 
 int flexran_find_dl_slice(mid_t mod_id, slice_id_t slice_id) {
   if (!mac_is_present(mod_id)) return -1;
+  slice_info_t *si = RC.mac[mod_id]->pre_processor_dl.slices;
+  for (int i = 0; i < si->num; ++i)
+    if (si->s[i]->id == slice_id)
+      return i;
   return -1;
 }
 
-//int flexran_get_dl_slice(mid_t mod_id, int slice_idx, Protocol__FlexSlice *s) {
-//}
+void flexran_get_dl_slice(mid_t mod_id,
+                          int slice_idx,
+                          Protocol__FlexSlice *slice,
+                          Protocol__FlexSliceAlgorithm algo) {
+  if (!mac_is_present(mod_id)) return;
+  slice_t *s_ = RC.mac[mod_id]->pre_processor_dl.slices->s[slice_idx];
+  slice->has_id = 1;
+  slice->id = s_->id;
+  slice->label = s_->label;
+  slice->scheduler = s_->dl_algo.name;
+  slice->params_case = PROTOCOL__FLEX_SLICE__PARAMS__NOT_SET;
+  switch (algo) {
+    case PROTOCOL__FLEX_SLICE_ALGORITHM__Static:
+      slice->static_ = malloc(sizeof(Protocol__FlexSliceStatic));
+      if (!slice->static_) return;
+      protocol__flex_slice_static__init(slice->static_);
+      slice->static_->has_poslow = 1;
+      slice->static_->poslow = ((static_slice_param_t *)s_->algo_data)->posLow;
+      slice->static_->has_poshigh = 1;
+      slice->static_->poshigh = ((static_slice_param_t *)s_->algo_data)->posHigh;
+      slice->params_case = PROTOCOL__FLEX_SLICE__PARAMS_STATIC;
+      break;
+    default:
+      break;
+  }
+}
 
 int flexran_get_num_dl_slices(mid_t mod_id) {
-  if (!mac_is_present(mod_id)) return -1;
-  return 0;
+  if (!mac_is_present(mod_id)) return 0;
+  if (!RC.mac[mod_id]->pre_processor_dl.slices) return 0;
+  return RC.mac[mod_id]->pre_processor_dl.slices->num;
 }
 
-/* TODO */
-void flexran_create_ul_slice(mid_t mod_id, slice_id_t slice_id) {
-  if (!mac_is_present(mod_id)) return;
-  return;
+int flexran_create_ul_slice(mid_t mod_id, const Protocol__FlexSlice *s) {
+  if (!mac_is_present(mod_id)) return -1;
+  void *params = NULL;
+  switch (s->params_case) {
+    case PROTOCOL__FLEX_SLICE__PARAMS_STATIC:
+      params = malloc(sizeof(static_slice_param_t));
+      if (!params) return 0;
+      ((static_slice_param_t *)params)->posLow = s->static_->poslow;
+      ((static_slice_param_t *)params)->posHigh = s->static_->poshigh;
+      break;
+    default:
+      break;
+  }
+  pp_impl_param_t *ul = &RC.mac[mod_id]->pre_processor_ul;
+  char *l = s->label ? strdup(s->label) : NULL;
+  void *algo = &ul->ul_algo; // default scheduler
+  if (s->scheduler) {
+    algo = dlsym(NULL, s->scheduler);
+    if (!algo) {
+      free(params);
+      LOG_E(FLEXRAN_AGENT, "cannot locate scheduler '%s'\n", s->scheduler);
+      return -15;
+    }
+  }
+  return ul->addmod_slice(ul->slices, s->id, l, algo, params);
 }
 
-/* TODO */
-int flexran_remove_ul_slice(mid_t mod_id, int slice_idx) {
-  if (!mac_is_present(mod_id)) return -1;
-  return -1;
+int flexran_remove_ul_slice(mid_t mod_id, const Protocol__FlexSlice *s) {
+  if (!mac_is_present(mod_id)) return 0;
+  const int idx = flexran_find_ul_slice(mod_id, s->id);
+  if (idx < 0) return 0;
+  pp_impl_param_t *ul = &RC.mac[mod_id]->pre_processor_ul;
+  return ul->remove_slice(ul->slices, idx);
 }
 
 int flexran_find_ul_slice(mid_t mod_id, slice_id_t slice_id) {
   if (!mac_is_present(mod_id)) return -1;
+  slice_info_t *si = RC.mac[mod_id]->pre_processor_ul.slices;
+  for (int i = 0; i < si->num; ++i)
+    if (si->s[i]->id == slice_id)
+      return i;
   return -1;
 }
 
-//int flexran_get_ul_slice(mid_t mod_id, int slice_idx, Protocol__FlexSlice *s) {
-//}
+void flexran_get_ul_slice(mid_t mod_id,
+                          int slice_idx,
+                          Protocol__FlexSlice *slice,
+                          Protocol__FlexSliceAlgorithm algo) {
+  if (!mac_is_present(mod_id)) return;
+  slice_t *s_ = RC.mac[mod_id]->pre_processor_ul.slices->s[slice_idx];
+  slice->has_id = 1;
+  slice->id = s_->id;
+  slice->label = s_->label;
+  slice->scheduler = s_->ul_algo.name;
+  slice->params_case = PROTOCOL__FLEX_SLICE__PARAMS__NOT_SET;
+  switch (algo) {
+    case PROTOCOL__FLEX_SLICE_ALGORITHM__Static:
+      slice->static_ = malloc(sizeof(Protocol__FlexSliceStatic));
+      if (!slice->static_) return;
+      protocol__flex_slice_static__init(slice->static_);
+      slice->static_->has_poslow = 1;
+      slice->static_->poslow = ((static_slice_param_t *)s_->algo_data)->posLow;
+      slice->static_->has_poshigh = 1;
+      slice->static_->poshigh = ((static_slice_param_t *)s_->algo_data)->posHigh;
+      slice->params_case = PROTOCOL__FLEX_SLICE__PARAMS_STATIC;
+      break;
+    default:
+      break;
+  }
+
+}
 
 int flexran_get_num_ul_slices(mid_t mod_id) {
+  if (!mac_is_present(mod_id)) return 0;
+  if (!RC.mac[mod_id]->pre_processor_ul.slices) return 0;
+  return RC.mac[mod_id]->pre_processor_ul.slices->num;
+}
+
+char *flexran_get_dl_scheduler_name(mid_t mod_id) {
+  if (!mac_is_present(mod_id)) return NULL;
+  return RC.mac[mod_id]->pre_processor_dl.dl_algo.name;
+}
+
+int flexran_set_dl_scheduler(mid_t mod_id, char *sched) {
   if (!mac_is_present(mod_id)) return -1;
+  void *d = dlsym(NULL, sched);
+  if (!d) return -2;
+  pp_impl_param_t *dl_pp = &RC.mac[mod_id]->pre_processor_dl;
+  dl_pp->dl_algo.unset(&dl_pp->dl_algo.data);
+  dl_pp->dl_algo = *(default_sched_dl_algo_t *) d;
+  dl_pp->dl_algo.data = dl_pp->dl_algo.setup();
   return 0;
 }
 
+char *flexran_get_ul_scheduler_name(mid_t mod_id) {
+  if (!mac_is_present(mod_id)) return NULL;
+  return RC.mac[mod_id]->pre_processor_ul.ul_algo.name;
+}
+
+int flexran_set_ul_scheduler(mid_t mod_id, char *sched) {
+  if (!mac_is_present(mod_id)) return -1;
+  void *d = dlsym(NULL, sched);
+  if (!d) return -2;
+  pp_impl_param_t *ul_pp = &RC.mac[mod_id]->pre_processor_ul;
+  ul_pp->ul_algo.unset(&ul_pp->ul_algo.data);
+  ul_pp->ul_algo = *(default_sched_ul_algo_t *) d;
+  ul_pp->ul_algo.data = ul_pp->ul_algo.setup();
+  return 0;
+}
 
 /************************** S1AP **************************/
 int flexran_get_s1ap_mme_pending(mid_t mod_id){

openair2/ENB_APP/flexran_agent_ran_api.h

@@ -656,41 +656,66 @@ int flexran_agent_rrc_gtp_get_teid_sgw(mid_t mod_id, rnti_t rnti, int index);
 uint32_t flexran_get_rrc_enb_ue_s1ap_id(mid_t mod_id, rnti_t rnti);
 
 /************************** Slice configuration **************************/
+/* Get the currently active DL slicing algorithm */
+Protocol__FlexSliceAlgorithm flexran_get_dl_slice_algo(mid_t mod_id);
+/* Set the active DL slicing algorithm */
+int flexran_set_dl_slice_algo(mid_t mod_id, Protocol__FlexSliceAlgorithm algo);
+
+/* Get the currently active UL slicing algorithm */
+Protocol__FlexSliceAlgorithm flexran_get_ul_slice_algo(mid_t mod_id);
+/* Set the active UL slicing algorithm */
+int flexran_set_ul_slice_algo(mid_t mod_id, Protocol__FlexSliceAlgorithm algo);
 
 /* Get the DL slice ID for a UE */
 int flexran_get_ue_dl_slice_id(mid_t mod_id, mid_t ue_id);
-/* Set the DL slice index(!) for a UE */
-//void flexran_set_ue_dl_slice_idx(mid_t mod_id, mid_t ue_id, int slice_idx);
+/* Set the DL slice for a UE */
+void flexran_set_ue_dl_slice_id(mid_t mod_id, mid_t ue_id, slice_id_t slice_id);
 
 /* Get the UL slice ID for a UE */
 int flexran_get_ue_ul_slice_id(mid_t mod_id, mid_t ue_id);
-/* Set the UL slice index(!) for a UE */
-//void flexran_set_ue_ul_slice_idx(mid_t mod_id, mid_t ue_id, int slice_idx);
+/* Set the UL slice for a UE */
+void flexran_set_ue_ul_slice_id(mid_t mod_id, mid_t ue_id, slice_id_t slice_id);
 
 /* Create slice in DL, returns the new slice index */
-//int flexran_create_dl_slice(mid_t mod_id, slice_id_t slice_id);
+int flexran_create_dl_slice(mid_t mod_id, const Protocol__FlexSlice *s);
 /* Remove slice in DL, returns new number of slices or -1 on error */
-//int flexran_remove_dl_slice(mid_t mod_id, int slice_idx);
+int flexran_remove_dl_slice(mid_t mod_id, const Protocol__FlexSlice *s);
 
 /* Finds slice in DL with given slice_id and returns slice index */
 int flexran_find_dl_slice(mid_t mod_id, slice_id_t slice_id);
 /* Return the parameters of slice at index slice_idx */
-//void flexran_get_dl_slice(mid_t mod_id, int slice_idx, Protocol__FlexSlice *s);
+void flexran_get_dl_slice(mid_t mod_id,
+                          int slice_idx,
+                          Protocol__FlexSlice *slice,
+                          Protocol__FlexSliceAlgorithm algo);
 /* Get the number of slices in DL */
 int flexran_get_num_dl_slices(mid_t mod_id);
 
 /* Create slice in UL, returns the new slice index */
-//int flexran_create_ul_slice(mid_t mod_id, slice_id_t slice_id);
+int flexran_create_ul_slice(mid_t mod_id, const Protocol__FlexSlice *s);
 /* Remove slice in UL */
-//int flexran_remove_ul_slice(mid_t mod_id, int slice_idx);
+int flexran_remove_ul_slice(mid_t mod_id, const Protocol__FlexSlice *s);
 
 /* Finds slice in DL with given slice_id and returns slice index */
 int flexran_find_ul_slice(mid_t mod_id, slice_id_t slice_id);
 /* Return the parameters of slice at index slice_idx */
-//void flexran_get_ul_slice(mid_t mod_id, int slice_idx, Protocol__FlexSlice *s);
+void flexran_get_ul_slice(mid_t mod_id,
+                          int slice_idx,
+                          Protocol__FlexSlice *slice,
+                          Protocol__FlexSliceAlgorithm algo);
 /* Get the number of slices in UL */
 int flexran_get_num_ul_slices(mid_t mod_id);
 
+/* Get the name of/Set the DL scheduling algorithm. If slicing is active, this
+ * corresponds to the default algorithm for slices, otherwise the currently
+ * used one. */
+char *flexran_get_dl_scheduler_name(mid_t mod_id);
+int flexran_set_dl_scheduler(mid_t mod_id, char *sched);
+
+/* Get the name of/Set the UL scheduler algorithm. Same applies as for the DL
+ * case */
+char *flexran_get_ul_scheduler_name(mid_t mod_id);
+int flexran_set_ul_scheduler(mid_t mod_id, char *sched);
 
 /************************** S1AP **************************/
 /* Get the number of MMEs to be connected */

openair2/LAYER2/MAC/main.c

@@ -100,6 +100,7 @@ void mac_top_init_eNB(void)
 
     mac[i]->if_inst = IF_Module_init(i);
 
+    mac[i]->pre_processor_dl.algorithm = 0;
     mac[i]->pre_processor_dl.dl = dlsch_scheduler_pre_processor;
     char *s = "round_robin_dl";
     void *d = dlsym(NULL, s);
@@ -107,6 +108,7 @@ void mac_top_init_eNB(void)
     mac[i]->pre_processor_dl.dl_algo = *(default_sched_dl_algo_t *) d;
     mac[i]->pre_processor_dl.dl_algo.data = mac[i]->pre_processor_dl.dl_algo.setup();
 
+    mac[i]->pre_processor_ul.algorithm = 0;
     mac[i]->pre_processor_ul.ul = ulsch_scheduler_pre_processor;
     s = "round_robin_ul";
     d = dlsym(NULL, s);

openair2/LAYER2/MAC/slicing/slicing.c

@@ -258,13 +258,26 @@ int addmod_static_slice_ul(slice_info_t *si,
   return si->num - 1;
 }
 
-int remove_static_slice(slice_info_t *si, uint8_t slice_idx) {
+int remove_static_slice_dl(slice_info_t *si, uint8_t slice_idx) {
   if (slice_idx == 0)
     return 0;
   slice_t *sr = _remove_slice(&si->num, si->s, si->UE_assoc_slice, slice_idx);
   if (!sr)
     return 0;
   free(sr->algo_data);
+  sr->dl_algo.unset(&sr->dl_algo.data);
+  free(sr);
+  return 1;
+}
+
+int remove_static_slice_ul(slice_info_t *si, uint8_t slice_idx) {
+  if (slice_idx == 0)
+    return 0;
+  slice_t *sr = _remove_slice(&si->num, si->s, si->UE_assoc_slice, slice_idx);
+  if (!sr)
+    return 0;
+  free(sr->algo_data);
+  sr->ul_algo.unset(&sr->ul_algo.data);
   free(sr);
   return 1;
 }
@@ -528,6 +541,7 @@ pp_impl_param_t static_dl_init(module_id_t mod_id, int CC_id) {
   dlp->posLow = 0;
   dlp->posHigh = to_rbg(RC.mac[mod_id]->common_channels[CC_id].mib->message.dl_Bandwidth) - 1;
   default_sched_dl_algo_t *algo = &RC.mac[mod_id]->pre_processor_dl.dl_algo;
+  algo->data = NULL;
   DevAssert(0 == addmod_static_slice_dl(si, 0, strdup("default"), algo, dlp));
   const UE_list_t *UE_list = &RC.mac[mod_id]->UE_info.list;
   for (int UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id])
@@ -539,7 +553,7 @@ pp_impl_param_t static_dl_init(module_id_t mod_id, int CC_id) {
   sttc.remove_UE = slicing_remove_UE;
   sttc.move_UE = slicing_move_UE;
   sttc.addmod_slice = addmod_static_slice_dl;
-  sttc.remove_slice = remove_static_slice;
+  sttc.remove_slice = remove_static_slice_dl;
   sttc.dl = static_dl;
   // current DL algo becomes default scheduler
   sttc.dl_algo = *algo;
@@ -564,6 +578,7 @@ pp_impl_param_t static_ul_init(module_id_t mod_id, int CC_id) {
   ulp->posLow = 0;
   ulp->posHigh = to_prb(RC.mac[mod_id]->common_channels[CC_id].ul_Bandwidth) - 1;
   default_sched_ul_algo_t *algo = &RC.mac[mod_id]->pre_processor_ul.ul_algo;
+  algo->data = NULL;
   DevAssert(0 == addmod_static_slice_ul(si, 0, strdup("default"), algo, ulp));
   const UE_list_t *UE_list = &RC.mac[mod_id]->UE_info.list;
   for (int UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id])
@@ -575,7 +590,7 @@ pp_impl_param_t static_ul_init(module_id_t mod_id, int CC_id) {
   sttc.remove_UE = slicing_remove_UE;
   sttc.move_UE = slicing_move_UE;
   sttc.addmod_slice = addmod_static_slice_ul;
-  sttc.remove_slice = remove_static_slice;
+  sttc.remove_slice = remove_static_slice_ul;
   sttc.ul = static_ul;
   // current DL algo becomes default scheduler
   sttc.ul_algo = *algo;