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FlexRAN: use lock-free ringbuffers for slice conf

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Use LFDS 7.0.0 Ringbuffer implementation to handle
* Slice Configuration
* UE slice association
which is then uploaded through MAC scheduling thread
This commit is contained in:
Robert Schmidt
2020-07-01 10:10:48 +02:00
parent 05c10662da
commit dcd43c1526
1 changed files with 92 additions and 8 deletions
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openair2/ENB_APP/CONTROL_MODULES/MAC/flexran_agent_mac.c
+92 -8
View File
@@ -49,6 +49,14 @@ struct lfds700_misc_prng_state ps[NUM_MAX_ENB];
struct lfds700_ringbuffer_element *dl_mac_config_array[NUM_MAX_ENB];
struct lfds700_ringbuffer_state ringbuffer_state[NUM_MAX_ENB];
/* Ringbuffer-related to slice configuration */
struct lfds700_ringbuffer_element *slice_config_array[NUM_MAX_ENB];
struct lfds700_ringbuffer_state slice_config_ringbuffer_state[NUM_MAX_ENB];
/* Ringbuffer-related to slice configuration */
struct lfds700_ringbuffer_element *ue_assoc_array[NUM_MAX_ENB];
struct lfds700_ringbuffer_state ue_assoc_ringbuffer_state[NUM_MAX_ENB];
int flexran_agent_mac_stats_reply_ue(mid_t mod_id,
Protocol__FlexUeStatsReport **ue_report,
int n_ue,
@@ -1341,6 +1349,33 @@ void flexran_agent_init_mac_agent(mid_t mod_id) {
AssertFatal(i == 0, "posix_memalign(): could not allocate aligned memory for lfds library\n");
lfds700_ringbuffer_init_valid_on_current_logical_core(&ringbuffer_state[mod_id],
dl_mac_config_array[mod_id], num_elements, &ps[mod_id], NULL);
struct lfds700_misc_prng_state scrng;
i = posix_memalign((void **) &slice_config_array[mod_id],
LFDS700_PAL_ATOMIC_ISOLATION_IN_BYTES,
sizeof(struct lfds700_ringbuffer_element) * num_elements);
AssertFatal(i == 0,
"posix_memalign(): could not allocate aligned memory\n");
lfds700_ringbuffer_init_valid_on_current_logical_core(
&slice_config_ringbuffer_state[mod_id],
slice_config_array[mod_id],
num_elements,
&scrng,
NULL);
struct lfds700_misc_prng_state uarng;
i = posix_memalign((void **) &ue_assoc_array[mod_id],
LFDS700_PAL_ATOMIC_ISOLATION_IN_BYTES,
sizeof(struct lfds700_ringbuffer_element) * num_elements);
AssertFatal(i == 0,
"posix_memalign(): could not allocate aligned memory\n");
lfds700_ringbuffer_init_valid_on_current_logical_core(
&ue_assoc_ringbuffer_state[mod_id],
ue_assoc_array[mod_id],
num_elements,
&uarng,
NULL);
for (i = 0; i < MAX_MOBILES_PER_ENB; i++) {
for (j = 0; j < 8; j++) {
if (RC.mac && RC.mac[mod_id])
@@ -1622,6 +1657,10 @@ int flexran_agent_unregister_mac_xface(mid_t mod_id)
lfds700_ringbuffer_cleanup(&ringbuffer_state[mod_id], NULL );
free(dl_mac_config_array[mod_id]);
lfds700_ringbuffer_cleanup(&slice_config_ringbuffer_state[mod_id], NULL );
free(slice_config_array[mod_id]);
lfds700_ringbuffer_cleanup(&ue_assoc_ringbuffer_state[mod_id], NULL );
free(ue_assoc_array[mod_id]);
lfds700_misc_library_cleanup();
AGENT_MAC_xface *xface = agent_mac_xface[mod_id];
@@ -1661,23 +1700,68 @@ void helper_destroy_mac_slice_config(Protocol__FlexSliceConfig *slice_config) {
void prepare_update_slice_config(mid_t mod_id, Protocol__FlexSliceConfig **slice_config) {
if (!*slice_config) return;
/* just use the memory and set to NULL in original */
Protocol__FlexSliceConfig *sc = *slice_config;
*slice_config = NULL;
/* TODO handle using lock-free queue */
apply_update_dl_slice_config(mod_id, sc->dl);
apply_update_ul_slice_config(mod_id, sc->ul);
struct lfds700_misc_prng_state ls;
LFDS700_MISC_MAKE_VALID_ON_CURRENT_LOGICAL_CORE_INITS_COMPLETED_BEFORE_NOW_ON_ANY_OTHER_LOGICAL_CORE;
lfds700_misc_prng_init(&ls);
enum lfds700_misc_flag overwrite_occurred_flag;
helper_destroy_mac_slice_config(*slice_config);
Protocol__FlexSliceConfig *overwritten_sc;
lfds700_ringbuffer_write(&slice_config_ringbuffer_state[mod_id],
NULL,
(void *)sc,
&overwrite_occurred_flag,
NULL,
(void **)&overwritten_sc,
&ls);
if (overwrite_occurred_flag == LFDS700_MISC_FLAG_RAISED) {
helper_destroy_mac_slice_config(overwritten_sc);
LOG_E(FLEXRAN_AGENT, "lost slice config: too many reconfigurations at once\n");
}
}
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);
struct lfds700_misc_prng_state ls;
LFDS700_MISC_MAKE_VALID_ON_CURRENT_LOGICAL_CORE_INITS_COMPLETED_BEFORE_NOW_ON_ANY_OTHER_LOGICAL_CORE;
lfds700_misc_prng_init(&ls);
enum lfds700_misc_flag overwrite_occurred_flag;
free(*ue_config);
*ue_config = NULL;
Protocol__FlexUeConfig *overwritten_ue_config;
lfds700_ringbuffer_write(&ue_assoc_ringbuffer_state[mod_id],
NULL,
(void *) *ue_config,
&overwrite_occurred_flag,
NULL,
(void **)&overwritten_ue_config,
&ls);
if (overwrite_occurred_flag == LFDS700_MISC_FLAG_RAISED) {
free(overwritten_ue_config);
LOG_E(FLEXRAN_AGENT, "lost UE-slice association: too many UE-slice associations at once\n");
}
}
void flexran_agent_slice_update(mid_t mod_id) {
struct lfds700_misc_prng_state ls;
LFDS700_MISC_MAKE_VALID_ON_CURRENT_LOGICAL_CORE_INITS_COMPLETED_BEFORE_NOW_ON_ANY_OTHER_LOGICAL_CORE;
lfds700_misc_prng_init(&ls);
Protocol__FlexSliceConfig *sc = NULL;
struct lfds700_ringbuffer_state *state = &slice_config_ringbuffer_state[mod_id];
if (lfds700_ringbuffer_read(state, NULL, (void **) &sc, &ls) != 0) {
apply_update_dl_slice_config(mod_id, sc->dl);
apply_update_ul_slice_config(mod_id, sc->ul);
helper_destroy_mac_slice_config(sc);
}
Protocol__FlexUeConfig *ue_config = NULL;
state = &ue_assoc_ringbuffer_state[mod_id];
if (lfds700_ringbuffer_read(state, NULL, (void **) &ue_config, &ls) != 0) {
apply_ue_slice_assoc_update(mod_id, ue_config);
free(ue_config);
}
}