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l2cap-ertm: only send tx packet when num unack packages < tx window size

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This commit is contained in:
Matthias Ringwald 2017-07-17 15:51:39 +02:00
parent bdbe2e4960
commit 212b6be258
1 changed files with 21 additions and 7 deletions
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28
src/l2cap.c
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@ -110,6 +110,9 @@ static void l2cap_le_notify_channel_can_send(l2cap_channel_t *channel);
static void l2cap_le_finialize_channel_close(l2cap_channel_t *channel);
static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm);
#endif
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
static int l2cap_ertm_num_unacknowledged_tx_packets(l2cap_channel_t * channel);
#endif
typedef struct l2cap_fixed_channel {
btstack_packet_handler_t callback;
@ -697,6 +700,13 @@ static int l2cap_ertm_send_supervisor_frame(l2cap_channel_t * channel, uint16_t
little_endian_store_16(acl_buffer, 8, control);
return l2cap_send_prepared(channel->local_cid, 2);
}
static int l2cap_ertm_num_unacknowledged_tx_packets(l2cap_channel_t * channel){
int unacknowledged_packets = channel->tx_send_index - channel->tx_read_index;
if (unacknowledged_packets < 0){
unacknowledged_packets += channel->num_tx_buffers;
}
return unacknowledged_packets;
}
#endif
static uint16_t l2cap_setup_options(l2cap_channel_t * channel, uint8_t * config_options){
@ -941,14 +951,18 @@ static void l2cap_run(void){
if (!hci_can_send_acl_packet_now(channel->con_handle)) continue;
if (channel->tx_send_index != channel->tx_write_index){
// packet ready to send!
int index = channel->tx_send_index;
channel->tx_send_index++;
if (channel->tx_send_index >= channel->num_tx_buffers){
channel->tx_send_index = 0;
int unacknowledged_packets = l2cap_ertm_num_unacknowledged_tx_packets(channel);
// check remote tx window
log_info("unacknowledged_packets %u, remote tx window size %u", unacknowledged_packets, channel->remote_tx_window_size);
if (unacknowledged_packets < channel->remote_tx_window_size){
int index = channel->tx_send_index;
channel->tx_send_index++;
if (channel->tx_send_index >= channel->num_tx_buffers){
channel->tx_send_index = 0;
}
l2cap_ertm_send_information_frame(channel, index);
continue;
}
l2cap_ertm_send_information_frame(channel, index);
continue;
}
if (channel->send_supervisor_frame_receiver_ready){