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nimble/ll: Allow to fine tune scheduler when scanning

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This allows to tune expected PDUs length when scheduling for auxilary
or sync PDUs.
This commit is contained in:
Szymon Janc
2020-02-14 10:12:13 +01:00
parent a3d81b7ae4
commit 550526703d
3 changed files with 33 additions and 15 deletions
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nimble/controller/include/controller/ble_ll_sched.h
-5
View File
@@ -47,11 +47,6 @@ extern "C" {
#define BLE_LL_SCHED_DIRECT_ADV_MAX_USECS (502)
#define BLE_LL_SCHED_MAX_ADV_PDU_USECS (376)
/* We don't know how big aux packet will be. It depends on adv packet len which
* can be up to 257. For now we fix it to 128 bytes, but we can optimize it.
*/
#define BLE_LL_SCHED_AUX_PTR_DFLT_BYTES_NUM (128)
/*
* This is the offset from the start of the scheduled item until the actual
* tx/rx should occur, in ticks.
nimble/controller/src/ble_ll_sched.c
+8 -10
View File
@@ -854,6 +854,7 @@ ble_ll_sched_sync_reschedule(struct ble_ll_sched_item *sch,
uint32_t window_ticks;
uint32_t start_time;
uint32_t end_time;
uint32_t dur;
int rc = 0;
os_sr_t sr;
@@ -871,11 +872,9 @@ ble_ll_sched_sync_reschedule(struct ble_ll_sched_item *sch,
start_time_rem_usecs -= 31;
}
/* TODO For now assume max sync packet, make expected data size
* configurable
*/
end_time = start_time + os_cputime_usecs_to_ticks(
ble_ll_pdu_tx_time_get(257, phy_mode));
dur = ble_ll_pdu_tx_time_get(MYNEWT_VAL(BLE_LL_SCHED_SCAN_SYNC_PDU_LEN),
phy_mode);
end_time = start_time + os_cputime_usecs_to_ticks(dur);
start_time -= g_ble_ll_sched_offset_ticks;
@@ -963,10 +962,8 @@ ble_ll_sched_sync(struct ble_ll_sched_item *sch,
start_time_rem_usecs -= 31;
}
/* TODO For now assume max sync packet, make expected data size
* configurable
*/
dur = ble_ll_pdu_tx_time_get(257, phy_mode);
dur = ble_ll_pdu_tx_time_get(MYNEWT_VAL(BLE_LL_SCHED_SCAN_SYNC_PDU_LEN),
phy_mode);
end_time = start_time + os_cputime_usecs_to_ticks(dur);
start_time -= g_ble_ll_sched_offset_ticks;
@@ -1645,7 +1642,8 @@ ble_ll_sched_aux_scan(struct ble_mbuf_hdr *ble_hdr,
*/
phy_mode = ble_ll_phy_to_phy_mode(aux_scan->aux_phy,
BLE_HCI_LE_PHY_CODED_ANY);
dur = ble_ll_pdu_tx_time_get(BLE_LL_SCHED_AUX_PTR_DFLT_BYTES_NUM, phy_mode);
dur = ble_ll_pdu_tx_time_get(MYNEWT_VAL(BLE_LL_SCHED_SCAN_AUX_PDU_LEN),
phy_mode);
end_time = start_time + os_cputime_usecs_to_ticks(dur);
sch->start_time = start_time;
nimble/controller/syscfg.yml
+25
View File
@@ -361,6 +361,31 @@ syscfg.defs:
when scheduling extended or periodic advertising event. This extends
T_MAFS.
value: 0
BLE_LL_SCHED_SCAN_AUX_PDU_LEN:
description: >
This is expected PDU len for AUX_ADV_IND and subsequent
AUX_CHAIN_IND. When scheduling scan scheduler will reserve time for
receiving this amount of time. Setting this to high value improves
reception of large PDUs but results in wasting scheduler space when
receiving small PDUs only. On the other hand too low value can
result in not being able to scan whole PDU due to being preempted
by next scheduled item. By default size matching legacy ADV_IND PDU
payload is used: ExtHeader (Flags, AdvA, ADI) + 31 bytes of data.
range: 1..257
value: 41
BLE_LL_SCHED_SCAN_SYNC_PDU_LEN:
description: >
This is expected PDU len for AUX_SYNC_IND and subsequent
AUX_CHAIN_IND. When scheduling scan scheduler will reserve time for
receiving this amount of time. Setting this to high value improves
reception of large PDUs but results in wasting scheduler space when
receiving small PDUs only. On the other hand too low value can
result in not being able to scan whole PDU due to being preempted
by next scheduled item. By default size matching PDU with legacy
data size is used: ExtHeader + 31 bytes of data.
range: 1..257
value: 32
# deprecated settings (to be defunct/removed eventually)
BLE_LL_DIRECT_TEST_MODE: