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Bluetooth: controller: Optimize LOW_LAT_ULL scheduling

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Optimize LOW_LAT_ULL scheduling by avoiding redundant
rx_demux mayfly enqueue. Only schedule after checking for
node rx or tx ack presence in the memq.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2021-02-02 13:49:02 +05:30 • committed by Anas Nashif
commit 08d3e49ee0
1 changed files with 18 additions and 0 deletions
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18
subsys/bluetooth/controller/ll_sw/ull.c
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@ -1893,6 +1893,24 @@ static void rx_demux_yield(void)
{
static memq_link_t link;
static struct mayfly mfy = {0, 0, &link, NULL, rx_demux};
struct node_rx_hdr *rx;
memq_link_t *link_peek;
link_peek = memq_peek(memq_ull_rx.head, memq_ull_rx.tail, (void **)&rx);
if (!link_peek) {
#if defined(CONFIG_BT_CONN)
struct node_tx *node_tx;
uint8_t ack_last;
uint16_t handle;
link_peek = ull_conn_ack_peek(&ack_last, &handle, &node_tx);
if (!link_peek) {
return;
}
#else /* !CONFIG_BT_CONN */
return;
#endif /* !CONFIG_BT_CONN */
}
/* Kick the ULL (using the mayfly, tailchain it) */
mayfly_enqueue(TICKER_USER_ID_ULL_HIGH, TICKER_USER_ID_ULL_HIGH, 1,