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l2cap-ertm: extract l2cap_ertm_can_store_packet_now, implement l2cap_ertm_notify_channel_can_send, support l2cap_request_can_send_now_event for ERTM connections

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This commit is contained in:
Matthias Ringwald 2017-07-24 16:48:44 +02:00
parent 0b20b13bb3
commit 9664600160
1 changed files with 44 additions and 16 deletions
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60
src/l2cap.c
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@ -111,6 +111,7 @@ 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 void l2cap_ertm_notify_channel_can_send(l2cap_channel_t * channel);
static int l2cap_ertm_num_unacknowledged_tx_packets(l2cap_channel_t * channel);
#endif
@ -407,30 +408,42 @@ void l2cap_request_can_send_now_event(uint16_t local_cid){
l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid);
if (!channel) return;
channel->waiting_for_can_send_now = 1;
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
if (channel->mode == L2CAP_CHANNEL_MODE_ENHANCED_RETRANSMISSION){
l2cap_ertm_notify_channel_can_send(channel);
return;
}
#endif
l2cap_notify_channel_can_send();
}
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
static int l2cap_ertm_can_store_packet_now(l2cap_channel_t * channel){
// 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
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;
return l2cap_ertm_can_store_packet_now(channel);
}
#endif
return hci_can_send_acl_packet_now(channel->con_handle);
@ -1581,6 +1594,15 @@ static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_
}
#endif
#ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
static void l2cap_ertm_notify_channel_can_send(l2cap_channel_t * channel){
if (l2cap_ertm_can_store_packet_now(channel)){
channel->waiting_for_can_send_now = 0;
l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid);
}
}
#endif
static void l2cap_notify_channel_can_send(void){
#ifdef ENABLE_CLASSIC
@ -1925,6 +1947,7 @@ uint8_t l2cap_ertm_set_ready(uint16_t local_cid){
}
static void l2cap_ertm_handle_req_seq(l2cap_channel_t * l2cap_channel, uint8_t req_seq){
int num_buffers_acked = 0;
l2cap_ertm_tx_packet_state_t * tx_state;
while (1){
tx_state = &l2cap_channel->tx_packets_state[l2cap_channel->tx_read_index];
@ -1933,6 +1956,7 @@ static void l2cap_ertm_handle_req_seq(l2cap_channel_t * l2cap_channel, uint8_t r
if (delta == 0) break; // all packets acknowledged
if (delta > l2cap_channel->remote_tx_window_size) break;
num_buffers_acked++;
log_info("RR seq %u => packet with tx_seq %u done", req_seq, tx_state->tx_seq);
// stop retransmission timer
@ -1945,6 +1969,10 @@ static void l2cap_ertm_handle_req_seq(l2cap_channel_t * l2cap_channel, uint8_t r
// no unack packages
if (l2cap_channel->tx_read_index == l2cap_channel->tx_write_index) break;
}
if (num_buffers_acked){
l2cap_ertm_notify_channel_can_send(l2cap_channel);
}
}
static l2cap_ertm_tx_packet_state_t * l2cap_ertm_get_tx_state(l2cap_channel_t * l2cap_channel, uint8_t tx_seq){