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l2cap-ertm: review use of retransmission timer

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This commit is contained in:
Matthias Ringwald 2017-07-24 17:51:03 +02:00
parent 474f5c3f07
commit 1e1a46bbd1
1 changed files with 17 additions and 14 deletions
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31
src/l2cap.c
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@ -304,6 +304,8 @@ static int l2cap_ertm_send_information_frame(l2cap_channel_t * channel, int inde
log_info("I-Frame: control 0x%04x", control);
little_endian_store_16(acl_buffer, 8, control);
memcpy(&acl_buffer[8+2], &channel->tx_packets_data[index * channel->local_mtu], tx_state->len);
// (re-)start retransmission timer on
l2cap_ertm_start_retransmission_timer(channel);
// send
return l2cap_send_prepared(channel->local_cid, 2 + tx_state->len);
}
@ -329,8 +331,6 @@ static void l2cap_ertm_store_fragment(l2cap_channel_t * channel, l2cap_segmentat
// update
channel->next_tx_seq = l2cap_next_ertm_seq_nr(channel->next_tx_seq);
l2cap_ertm_next_tx_write_index(channel);
l2cap_ertm_start_retransmission_timer(channel);
}
static int l2cap_ertm_send(l2cap_channel_t * channel, uint8_t * data, uint16_t len){
@ -569,10 +569,19 @@ uint8_t l2cap_ertm_set_ready(uint16_t local_cid){
return ERROR_CODE_SUCCESS;
}
static void l2cap_ertm_handle_req_seq(l2cap_channel_t * l2cap_channel, uint8_t req_seq){
// Process-ReqSeq
static void l2cap_ertm_process_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){
// no unack packages
if (l2cap_channel->tx_read_index == l2cap_channel->tx_write_index) {
// stop retransmission timer
l2cap_ertm_stop_retransmission_timer(l2cap_channel);
break;
}
tx_state = &l2cap_channel->tx_packets_state[l2cap_channel->tx_read_index];
// calc delta
int delta = (req_seq - tx_state->tx_seq) & 0x03f;
@ -582,16 +591,10 @@ static void l2cap_ertm_handle_req_seq(l2cap_channel_t * l2cap_channel, uint8_t r
num_buffers_acked++;
log_info("RR seq %u => packet with tx_seq %u done", req_seq, tx_state->tx_seq);
// stop retransmission timer
l2cap_ertm_stop_retransmission_timer(l2cap_channel);
l2cap_channel->tx_read_index++;
if (l2cap_channel->tx_read_index >= l2cap_channel->num_rx_buffers){
l2cap_channel->tx_read_index = 0;
}
// no unack packages
if (l2cap_channel->tx_read_index == l2cap_channel->tx_write_index) break;
}
if (num_buffers_acked){
@ -2832,7 +2835,7 @@ static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
switch (s){
case L2CAP_SUPERVISORY_FUNCTION_RR_RECEIVER_READY:
log_info("L2CAP_SUPERVISORY_FUNCTION_RR_RECEIVER_READY");
l2cap_ertm_handle_req_seq(l2cap_channel, req_seq);
l2cap_ertm_process_req_seq(l2cap_channel, req_seq);
if (poll && final){
// S-frames shall not be transmitted with both the F-bit and the P-bit set to 1 at the same time.
log_error("P=F=1 in S-Frame");
@ -2865,8 +2868,8 @@ static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
break;
case L2CAP_SUPERVISORY_FUNCTION_REJ_REJECT:
log_info("L2CAP_SUPERVISORY_FUNCTION_REJ_REJECT");
l2cap_ertm_handle_req_seq(l2cap_channel, req_seq);
// rsetart transmittion from last unacknowledted packet (earlier packets already freed in l2cap_ertm_handle_req_seq)
l2cap_ertm_process_req_seq(l2cap_channel, req_seq);
// rsetart transmittion from last unacknowledted packet (earlier packets already freed in l2cap_ertm_process_req_seq)
l2cap_channel->tx_send_index = l2cap_channel->tx_read_index;
break;
case L2CAP_SUPERVISORY_FUNCTION_RNR_RECEIVER_NOT_READY:
@ -2875,7 +2878,7 @@ static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
case L2CAP_SUPERVISORY_FUNCTION_SREJ_SELECTIVE_REJECT:
log_info("L2CAP_SUPERVISORY_FUNCTION_SREJ_SELECTIVE_REJECT");
if (poll){
l2cap_ertm_handle_req_seq(l2cap_channel, req_seq);
l2cap_ertm_process_req_seq(l2cap_channel, req_seq);
}
// find requested i-frame
tx_state = l2cap_ertm_get_tx_state(l2cap_channel, req_seq);
@ -2898,7 +2901,7 @@ static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
log_info("Control: 0x%04x => SAR %u, ReqSeq %02u, R?, TxSeq %02u", control, (int) sar, req_seq, tx_seq);
log_info("SAR: pos %u", l2cap_channel->reassembly_pos);
log_info("State: expected_tx_seq %02u, req_seq %02u", l2cap_channel->expected_tx_seq, l2cap_channel->req_seq);
l2cap_ertm_handle_req_seq(l2cap_channel, req_seq);
l2cap_ertm_process_req_seq(l2cap_channel, req_seq);
if (final){
// final bit set <- response to RR with poll bit set. All not acknowledged packets need to be retransmitted
l2cap_channel->tx_send_index = l2cap_channel->tx_read_index;