void XCCHL1Encoder::writeHighSide(const L2Frame& frame)
{
switch (frame.primitive()) {
case DATA:
// En,.ode and send data.
if (!active()) { LOG(INFO) << "XCCHL1Encoder::writeHighSide sending on non-active channel"; }
resync();
sendFrame(frame);
break;
case ESTABLISH:
// Open both sides of the link.
// The phone is waiting to see the idle pattern.
open();
if (sibling()) sibling()->open();
return;
case RELEASE:
// Normally, we get here after a DISC-DM handshake in L2.
// Close both sides of the link, knowing that the phone will do the same.
close();
if (sibling()) sibling()->close();
break;
case ERROR:
// If we got here, it means the link failed in L2 after several ack timeouts.
// Close the tx side and just let the receiver L1 time out on its own.
// Otherwise, we risk recycling the channel while the phone's still active.
close();
break;
default:
LOG(ERROR) << "unhandled primitive " << frame.primitive() << " in L2->L1";
assert(0);
}
}
void SACCHLogicalChannel::writeToL1(const L2Frame& frame)
{
// The SAP may or may not be present, depending on the channel type.
OBJLOG(DEBUG) << frame;
switch (frame.primitive()) {
case L2_DATA:
mL1->writeHighSide(frame);
break;
default:
OBJLOG(ERR) << "unhandled primitive " << frame.primitive() << " in L2->L1";
devassert(0);
}
}
void L2SAPMux::sapWriteFromL1(const L2Frame& frame)
{
OBJLOG(DEBUG) << frame;
unsigned sap;
// (pat) Add switch to validate upstream primitives. The upstream only generates a few primitives;
// the rest are created in L2LAPDm.
switch (frame.primitive()) {
case L2_DATA:
sap = frame.SAPI();
assert(sap == SAPI0 || sap == SAPI3);
if (mL2[sap]) {
mL2[sap]->l2dlWriteLowSide(frame);
} else {
LOG(WARNING) << "received DATA for unsupported"<<LOGVAR(sap);
}
return;
case PH_CONNECT:
// All this does is fully reset LAPDm; copy it out to every SAP.
for (int s = 0; s <= 3; s++) {
if (mL2[s]) mL2[s]->l2dlWriteLowSide(frame); // Note: the frame may have the wrong SAP in it, but LAPDm doesnt care.
}
return;
default:
// If you get this assertion, make SURE you know what will happen upstream to that primitive.
devassert(0);
return; // make g++ happy.
}
}
void L2LAPDm::writeL1Ack(const L2Frame& frame)
{
// Caller should hold mLock.
// GSM 04.06 5.4.4.2
OBJLOG(DEEPDEBUG) <<"L2LAPDm::writeL1Ack " << frame;
frame.copyTo(mSentFrame);
mSentFrame.primitive(frame.primitive());
writeL1(frame);
mT200.set();
}
void LoopbackSAPMux::writeHighSide(const L2Frame& frame)
{
OBJLOG(DEBUG) << "Loopback " << frame;
// Substitute primitive
L2Frame newFrame(frame);
unsigned SAPI = frame.SAPI();
switch (frame.primitive()) {
case ERROR: SAPI=0; break;
case RELEASE: return;
default: break;
}
// Because this is a test fixture, as assert here.
// If this were not a text fixture, we would print a warning
// and ignore the frame.
assert(mUpstream[SAPI]);
ScopedLock lock(mLock);
mUpstream[SAPI]->writeLowSide(newFrame);
}
void SAPMux::writeLowSide(const L2Frame& frame)
{
OBJLOG(DEBUG) << frame.SAPI() << " " << frame;
unsigned SAPI = frame.SAPI();
bool data = frame.primitive()==DATA;
if (data && (!mUpstream[SAPI])) {
LOG(WARNING) << "received DATA for unsupported SAP " << SAPI;
return;
}
if (data) {
mUpstream[SAPI]->writeLowSide(frame);
} else {
// If this is a non-data primitive, copy it out to every SAP.
for (int i=0; i<4; i++) {
if (mUpstream[i]) mUpstream[i]->writeLowSide(frame);
}
}
}
void L2LogicalChannel::writeLowSide(const L2Frame& frame)
{
// If this is the first good frame of a new transaction,
// stop T3101 and tell L2 we're alive down here.
if (mT3101.active()) {
mT3101.reset();
// Inform L3 that we are alive down here.
// This does not block; goes to a InterthreadQueue L2LAPdm::mL1In
sapWriteFromL1(L2Frame(PH_CONNECT));
}
switch (frame.primitive()) {
case HANDOVER_ACCESS: // Only send this on SAPI 0.
writeToL3(new L3Frame(SAPI0,HANDOVER_ACCESS));
break;
default:
sapWriteFromL1(frame);
break;
}
}
