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Bluetooth: Controller: One extra ISO rx buffer for empty PDU reception

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Budget for one extra ISO Rx PDU buffer for empty/NULL PDU
reception that has to always remain free in order to be able
to setup radio h/w for new PDU receptions.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2022-11-28 15:30:48 +05:30 • committed by Carles Cufí
commit 46ead9915d
2 changed files with 17 additions and 4 deletions
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16
subsys/bluetooth/controller/ll_sw/nordic/lll/lll_sync_iso.c
View file

@ -271,6 +271,9 @@ static int prepare_cb_common(struct lll_prepare_param *p)
radio_crc_configure(PDU_CRC_POLYNOMIAL, sys_get_le24(crc_init));
lll_chan_set(data_chan_use);
/* By design, there shall alway be one free node rx available for
* setting up radio for new PDU reception.
*/
node_rx = ull_iso_pdu_rx_alloc_peek(1U);
LL_ASSERT(node_rx);
radio_pkt_rx_set(node_rx->pdu);
@ -477,6 +480,12 @@ static void isr_rx(void *param)
lll->ctrl) {
lll->cssn_curr = lll->cssn_next;
/* By design, there shall alway be one free node rx
* available for setting up radio for new PDU reception.
* Control procedure handling does not consume any
* node rx, hence checking for one free node rx is
* sufficient.
*/
node_rx = ull_iso_pdu_rx_alloc_peek(1U);
LL_ASSERT(node_rx);
@ -487,7 +496,7 @@ static void isr_rx(void *param)
isr_rx_ctrl_recv(lll, pdu);
} else {
/* check if there are 2 free rx buffers, one will be
/* Check if there are 2 free rx buffers, one will be
* consumed to receive the current PDU, and the other
* is to ensure a PDU can be setup for the radio DMA to
* receive in the next sub_interval/iso_interval.
@ -673,7 +682,7 @@ isr_rx_find_subevent:
iso_rx_put(node_rx->hdr.link, node_rx);
} else {
/* check if there are 2 free rx buffers, one
/* Check if there are 2 free rx buffers, one
* will be consumed to generate PDU with invalid
* status, and the other is to ensure a PDU can
* be setup for the radio DMA to receive in the
@ -805,6 +814,9 @@ isr_rx_next_subevent:
}
lll_chan_set(data_chan_use);
/* By design, there shall alway be one free node rx available for
* setting up radio for new PDU reception.
*/
node_rx = ull_iso_pdu_rx_alloc_peek(1U);
LL_ASSERT(node_rx);
radio_pkt_rx_set(node_rx->pdu);

5
subsys/bluetooth/controller/ll_sw/ull_iso.c
View file

@ -110,10 +110,11 @@ static void *datapath_free;
* - mem_iso_rx: Backing data pool for PDU buffer elements
* - mem_link_iso_rx: Pool of memq_link_t elements
*
* One extra rx buffer is reserved for empty ISO PDU reception.
* Two extra links are reserved for use by the ll_iso_rx and ull_iso_rx memq.
*/
static RXFIFO_DEFINE(iso_rx, NODE_RX_HEADER_SIZE + ISO_RX_BUFFER_SIZE,
CONFIG_BT_CTLR_ISO_RX_BUFFERS, 2);
static RXFIFO_DEFINE(iso_rx, ((NODE_RX_HEADER_SIZE) + (ISO_RX_BUFFER_SIZE)),
(CONFIG_BT_CTLR_ISO_RX_BUFFERS + 1U), 2U);
static MEMQ_DECLARE(ll_iso_rx);
#if defined(CONFIG_BT_CTLR_ISO_VENDOR_DATA_PATH)