331 lines
7.6 KiB
C
331 lines
7.6 KiB
C
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/*++
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Copyright (c) 1996-1999 Microsoft Corporation
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Module Name:
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clstate.c
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Abstract:
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state machine for gpc client vcs
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Author:
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Yoram Bernet (yoramb) 28-Dec-1997
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Rajesh Sundaram (rajeshsu) 01-Aug-1998
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Environment:
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Kernel Mode
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Revision History:
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Rajesh Sundaram (rajeshsu) 04-Apr-1998 - reworked completly as another state
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(CL_INTERNAL_CALL_COMPLETE) added.
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--*/
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#include "psched.h"
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#pragma hdrstop
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/* External */
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/* Static */
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/* Forward */
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/* End Forward */
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/*++
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Routine Description:
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Initiate a close call on this VC and notify the GPC. Always called with the VC lock held.
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Return Value:
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None
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--*/
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VOID
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InternalCloseCall(
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PGPC_CLIENT_VC Vc
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)
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{
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PADAPTER Adapter = Vc->Adapter;
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PsDbgOut(DBG_INFO,
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DBG_STATE,
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("[InternalCloseCall]: Adapter %08X, ClVcState is %s on VC %x\n",
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Vc->Adapter, GpcVcState[Vc->ClVcState], Vc));
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switch(Vc->ClVcState){
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case CL_INTERNAL_CLOSE_PENDING:
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//
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// We could get here if we get an unbind at our wan instance with a
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// NDIS_STATUS_WAN_LINE_DOWN. We could be trying to do an InternalClose
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// from both places.
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//
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PsAssert(Vc->Flags & INTERNAL_CLOSE_REQUESTED);
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PS_UNLOCK_DPC(&Vc->Lock);
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PS_UNLOCK(&Adapter->Lock);
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break;
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case CL_CALL_PENDING:
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case CL_MODIFY_PENDING:
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//
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// We've been asked to close before the call
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// has completed.
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//
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// Set a flag so that we'll close it when the
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// call completes.
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//
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PsAssert(!(Vc->Flags & GPC_CLOSE_REQUESTED));
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Vc->Flags |= INTERNAL_CLOSE_REQUESTED;
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PS_UNLOCK_DPC(&Vc->Lock);
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PS_UNLOCK(&Adapter->Lock);
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break;
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case CL_INTERNAL_CALL_COMPLETE:
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//
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// The call has been completed, but we may or may not
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// have told the GPC. Wait till we tell the GPC. We will
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// complete this when we transistion to CL_CALL_COMPLETE
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//
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PsAssert(!IsBestEffortVc(Vc));
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Vc->Flags |= INTERNAL_CLOSE_REQUESTED;
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PS_UNLOCK_DPC(&Vc->Lock);
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PS_UNLOCK(&Adapter->Lock);
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break;
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case CL_CALL_COMPLETE:
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//
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// Transition to CL_INTERNAL_CLOSE_PENDING and
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// ask the GPC to close.
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//
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Vc->ClVcState = CL_INTERNAL_CLOSE_PENDING;
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Vc->Flags |= INTERNAL_CLOSE_REQUESTED;
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PS_UNLOCK_DPC(&Vc->Lock);
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PS_UNLOCK(&Adapter->Lock);
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CmCloseCall(Vc);
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break;
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case CL_GPC_CLOSE_PENDING:
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//
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// The GPC has already asked us to close. Now,
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// we are also closing down - We need not do
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// anything here - Need not even inform the GPC.
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// we can just pretend as the InternalClose never
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// happened
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Vc->Flags &= ~INTERNAL_CLOSE_REQUESTED;
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PS_UNLOCK_DPC(&Vc->Lock);
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PS_UNLOCK(&Adapter->Lock);
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break;
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default:
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PS_UNLOCK_DPC(&Vc->Lock);
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PS_UNLOCK(&Adapter->Lock);
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PsDbgOut(DBG_FAILURE,
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DBG_STATE,
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("[InternalCloseCall]: invalid state %s on VC %x\n",
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GpcVcState[Vc->ClVcState], Vc));
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PsAssert(0);
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break;
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}
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}
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VOID
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CallSucceededStateTransition(
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PGPC_CLIENT_VC Vc
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)
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{
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PsDbgOut(DBG_INFO,
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DBG_STATE,
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("[CallSucceededStateTransition]: Adapter %08X, ClVcState is %s on VC %x\n",
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Vc->Adapter, GpcVcState[Vc->ClVcState], Vc));
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PS_LOCK(&Vc->Lock);
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switch(Vc->ClVcState){
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case CL_GPC_CLOSE_PENDING:
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PS_UNLOCK(&Vc->Lock);
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PsDbgOut(DBG_FAILURE,
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DBG_STATE,
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("[CallSucceededStateTransition]: bad state %s on VC %x\n",
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GpcVcState[Vc->ClVcState], Vc));
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PsAssert(0);
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break;
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case CL_INTERNAL_CALL_COMPLETE:
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PsAssert(!IsBestEffortVc(Vc));
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#if DBG
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if(Vc->Flags & GPC_MODIFY_REQUESTED) {
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PsAssert(! (Vc->Flags & GPC_CLOSE_REQUESTED));
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}
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if(Vc->Flags & GPC_CLOSE_REQUESTED) {
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PsAssert(! (Vc->Flags & GPC_MODIFY_REQUESTED));
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}
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#endif
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//
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// Note that if both a modify & a internal remove is requested,
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// we just satisfy the modify. When the modify goes into internal
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// call complete, we will satify the remove
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//
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if(Vc->Flags & GPC_MODIFY_REQUESTED) {
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NDIS_STATUS Status;
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Vc->ClVcState = CL_MODIFY_PENDING;
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Vc->Flags &= ~GPC_MODIFY_REQUESTED;
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PS_UNLOCK(&Vc->Lock);
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Status = CmModifyCall(Vc);
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if(Status != NDIS_STATUS_PENDING) {
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CmModifyCallComplete(Status, Vc, Vc->ModifyCallParameters);
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}
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break;
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}
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if(Vc->Flags & GPC_CLOSE_REQUESTED) {
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//
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// The GPC has asked us to close after it
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// was notified of the call completion but
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// before we managed to transition to the
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// CL_CALL_COMPLETE state.
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//
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Vc->ClVcState = CL_GPC_CLOSE_PENDING;
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PS_UNLOCK(&Vc->Lock);
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CmCloseCall(Vc);
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break;
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}
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if(Vc->Flags & INTERNAL_CLOSE_REQUESTED){
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//
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// We had an internal close request while
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// the call was pending. The GPC has already
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// been notified, so - we need to ask it to
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// close.
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//
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Vc->ClVcState = CL_INTERNAL_CLOSE_PENDING;
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PS_UNLOCK(&Vc->Lock);
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CmCloseCall(Vc);
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break;
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}
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Vc->ClVcState = CL_CALL_COMPLETE;
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PS_UNLOCK(&Vc->Lock);
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break;
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case CL_MODIFY_PENDING:
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//
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// Typically, just transition to CL_CALL_COMPLETE
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//
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PsAssert(!(Vc->Flags & GPC_CLOSE_REQUESTED));
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PsAssert(!(Vc->Flags & GPC_MODIFY_REQUESTED));
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PsAssert(!IsBestEffortVc(Vc));
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Vc->ClVcState = CL_INTERNAL_CALL_COMPLETE;
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PS_UNLOCK(&Vc->Lock);
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break;
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case CL_CALL_PENDING:
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//
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// Typically, just transition to CL_INTERNAL_CALL_COMPLETE.
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//
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PsAssert(!(Vc->Flags & GPC_CLOSE_REQUESTED));
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PsAssert(!(Vc->Flags & GPC_MODIFY_REQUESTED));
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//
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// Call succeeded. Leave it up.
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//
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if(IsBestEffortVc(Vc))
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{
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Vc->ClVcState = CL_CALL_COMPLETE;
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}
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else
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{
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Vc->ClVcState = CL_INTERNAL_CALL_COMPLETE;
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}
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PS_UNLOCK(&Vc->Lock);
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break;
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default:
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PS_UNLOCK(&Vc->Lock);
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PsDbgOut(DBG_FAILURE,
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DBG_STATE,
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("[CallSucceededStateTransition]: invalid state %s on VC %x\n",
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GpcVcState[Vc->ClVcState], Vc));
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PsAssert(0);
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}
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}
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/* end clstate.c */
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