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l2cap-ertm: send S-SREJ if only a single packet is missing

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This commit is contained in:
Matthias Ringwald 2017-07-18 17:26:26 +02:00
parent c7309e8d6f
commit df2191a738
2 changed files with 18 additions and 2 deletions
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17
src/l2cap.c
View File

@ -1054,6 +1054,13 @@ static void l2cap_run(void){
l2cap_ertm_send_supervisor_frame(channel, control);
continue;
}
if (channel->send_supervisor_frame_selective_reject){
channel->send_supervisor_frame_selective_reject = 0;
log_info("Send S-Frame: SREJ %u", channel->expected_tx_seq);
uint16_t control = l2cap_encanced_control_field_for_supevisor_frame( L2CAP_SUPERVISORY_FUNCTION_SREJ_SELECTIVE_REJECT, 0, 0, channel->expected_tx_seq);
l2cap_ertm_send_supervisor_frame(channel, control);
continue;
}
if (channel->srej_active){
int i;
@ -2716,8 +2723,14 @@ static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
break;
}
} else {
log_info("Received unexpected frame TxSeq %u but expected %u", tx_seq, l2cap_channel->expected_tx_seq);
l2cap_channel->send_supervisor_frame_reject = 1;
int delta = (tx_seq - l2cap_channel->expected_tx_seq) & 0x3f;
if (delta < 2){
log_info("Received unexpected frame TxSeq %u but expected %u -> send S-SREJ", tx_seq, l2cap_channel->expected_tx_seq);
l2cap_channel->send_supervisor_frame_selective_reject = 1;
} else {
log_info("Received unexpected frame TxSeq %u but expected %u -> send S-REJ", tx_seq, l2cap_channel->expected_tx_seq);
l2cap_channel->send_supervisor_frame_reject = 1;
}
}
}
break;

3
src/l2cap.h
View File

@ -246,6 +246,9 @@ typedef struct {
// receiver: send REJ frame - flag
uint8_t send_supervisor_frame_reject;
// receiver: send SREJ frame - flag
uint8_t send_supervisor_frame_selective_reject;
// receiver: value of tx_seq in next expected i-frame
uint8_t expected_tx_seq;