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l2cap-ertm: implement l2cap_can_send_packet_now for ERTM

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This commit is contained in:
Matthias Ringwald 2017-07-24 16:32:23 +02:00
parent f85ade6bf6
commit 0b20b13bb3
1 changed files with 26 additions and 0 deletions
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26
src/l2cap.c
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@ -413,14 +413,40 @@ void l2cap_request_can_send_now_event(uint16_t local_cid){
int l2cap_can_send_packet_now(uint16_t local_cid){
l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid);
if (!channel) return 0;
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
if (channel->mode == L2CAP_CHANNEL_MODE_ENHANCED_RETRANSMISSION){
// get num free tx buffers
int num_tx_buffers_used = channel->tx_write_index - channel->tx_read_index;
if (num_tx_buffers_used < 0){
num_tx_buffers_used += channel->num_tx_buffers;
}
int num_free_tx_buffers = channel->num_tx_buffers - num_tx_buffers_used;
// calculate num tx buffers for remote MTU
int num_tx_buffers_for_max_remote_mtu;
if (channel->remote_mtu <= channel->remote_mps){
// MTU fits into single packet
num_tx_buffers_for_max_remote_mtu = 1;
} else {
// include SDU Length
num_tx_buffers_for_max_remote_mtu = (channel->remote_mtu + 2 + (channel->remote_mps - 1)) / channel->remote_mps;
}
return num_tx_buffers_for_max_remote_mtu <= num_free_tx_buffers;
}
#endif
return hci_can_send_acl_packet_now(channel->con_handle);
}
int l2cap_can_send_prepared_packet_now(uint16_t local_cid){
l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid);
if (!channel) return 0;
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
if (channel->mode == L2CAP_CHANNEL_MODE_ENHANCED_RETRANSMISSION){
return 0;
}
#endif
return hci_can_send_prepared_acl_packet_now(channel->con_handle);
}
uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){
l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid);
if (channel) {