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Bluetooth: controller: Internal documentation of node rx count

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Document with comments, the explanation of node rx count and
the design of the free rx PDU management.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2020-12-17 12:49:04 +05:30 • committed by Carles Cufí
commit 5d3d9b7522
1 changed files with 12 additions and 0 deletions
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12
subsys/bluetooth/controller/ll_sw/ull.c
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@ -199,13 +199,25 @@ static struct {
uint8_t pool[sizeof(memq_link_t) * EVENT_DONE_MAX];
} mem_link_done;
/* Minimum number of node rx for ULL to LL/HCI thread per connection.
* Increasing this by times the max. simultaneous connection count will permit
* simultaneous parallel PHY update or Connection Update procedures amongst
* active connections.
*/
#if defined(CONFIG_BT_CTLR_PHY) && defined(CONFIG_BT_CTLR_DATA_LENGTH)
#define LL_PDU_RX_CNT 3
#else
#define LL_PDU_RX_CNT 2
#endif
/* No. of node rx for LLL to ULL.
* Reserve 3, 1 for adv data, 1 for scan response and 1 for empty PDU reception.
*/
#define PDU_RX_CNT (CONFIG_BT_CTLR_RX_BUFFERS + 3)
/* Part sum of LLL to ULL and ULL to LL/HCI thread node rx count.
* Will be used below in allocating node rx pool.
*/
#define RX_CNT (PDU_RX_CNT + LL_PDU_RX_CNT)
static MFIFO_DEFINE(pdu_rx_free, sizeof(void *), PDU_RX_CNT);