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StackInfo: Locks TmpRef Count
TempRefs: also increment/decrement the StackInfo.TmpRef count -- on exiting top call,assert if this is nonzero.
LinkObjects(Obj1, Obj2);
Locking -- add option to compute checksum of object and save it. Validate checksupon unlocking. Also run object-specific validation functions just before unlocking.
typedef struct{ LOG *pLog; STATE *pStateHistory; ULONG Checksum; ULONG PrevState; BOOL ValidationFunction; OBJECTS *pLinkedObjects;
// // Pointer to the stack record of the thread that currently owns // the lock on this object, if any. So if a function F expects an object pObj // to be locked on entry, it can do something like: // void F(STACKRECORD *pSR, FOOBAR *pObj) // { // ASSERT(pObj->pDiags->pSR == pSR); // } // STACKRECORD *pSR;
} OBJECT_DIAGNOSTICS;
typedef struct{ ULONG Sig; ULONG State; LOCK *pLock; OBJFN pObjFn; OBJECT_DIAGNOSTICS *pDiags; ULONG TmpRefs; ULONG LinkRefs; TASKLIST *Tasks; OBJECT *pTmpNext; // Impromptu list.} OBJECT_HEADER;
Enumeration functions
WeakEnumerateList(list, pfn) -- calls pfn on each item in the list, but releasing list lock before calling pfn. Since it releases the list lock, it can't simply process the elements in order.
Several flavors of these enumeration functions: 1. Enumerate holding list lock and object lock throughout -- strict enumeration. 2. While(change) {Run-through-items until lock released} 3. Optimistic, weak enumeration -- maintain next pointer within list structure, if next pointer matches when you next get list lock, use it, otherwise
4. Concept of using a "impromptu list", using the pTmpNext field -- optimisically, all the objects that need to be worked on will have their pTmpNext field unused (set to an illegal value) so can be used to set up a temporary list -- no needto synchronize access to this list -- only the creator can use it and must disband it (set pTmpNext members back to the illegal value) when done. Potential of having multiple pTmpNext fields to minimize risk of collisions if objects are heavily used.
5. Enumeration of functions that use only static-data -- no need to claim lock. 6. Various search/modify funcions -- enumeration could return a single one, or a (perhaps impromptu) list of objects found by the the function, or could delete the objects found by the function.
Goal is to not to require user code to have to enumerate lists explicitly, and to minimize the amount of explicit lock and refcount manipulation. [Enumeration functions hide any temprefing done]
temporary combo impromptu list + temp-list:typedef struct{ OBJECT *pImpromptuList; SLIST *pOthers; // these ones had the pTmpNext field in use so we // explicitly create an SLIST of pointers to these.} ENUMERATION_RESULT;
FreeEnumerationResult(ENUMERATION_RESULT *ER, STACKRECORD *pSR, BOOLEAN fDeref){ // run throuch impromptu list, de-refing the tempref. OBJECT *pObj = pER->pImpromptuList; while (pObj!=NULL) { OBJECT *pNextObj = pObj->pTmpNext; pObj->TmpNext = ILLEGAL_POINTER;
if (fDeref) { Lock(pObj, pSR); TmpDeref(pObj, pSR); Unlock(&pObj, pSR); // if object has gone, pObj will be set to NULL. }
pObj = pNextObj; }
// Run through pOthers list; while (pOthers != NULL) { Pop(&Others, &pObj); if (bDeref) { Lock(pObj, pSR); TmpDeref(pObj, pSR); Unlock(&pObj, pSR); // if object has gone, pObj will be set to NULL. } }
}
Locking: bit in lock struture can be set to prevent unlocking -- preventing a lower-level function from temporarily unlocking/locking a function
Tasks -- should be associated with the adapter/interface, not each object -- because tasks -- hmm well maybe let each object decide. Timers -- are they tasks?
You can have a "primary state change task pointer " for an object -- at any one timean object can have only one such task active, although it may vary depending on thestate change involve -- eg ConnectCallTask to move fron unconnected to connected,and DisconnectCallTask to move from connected to unconnected.The object's primary state should reflect the task running: unconnected, connecting*, connected, disconnecting* (* means that a state-change task is running).
A task can register itself to pend until some other particular task is completed.When a task completes it's list of other tasks are completed one by one, makingsure locks and inter-task refcounts are properly maintained.
ValidateXXXPacket function -- verifies that internal structures of incoming packets are valid, i.e., fields like sizes and offsets don't point to locations outside the packet.
Concept of Collections of objects -- hides details of how the collection is organized -- hash table, list, hybrid, etc , alloc/dealloc,
Use arrays of pointers freely. Possibly keep a dynamic estimate the the sizeof these arrays to allocate.
Dynamic array class:typedef struct{ UINT TotalSize; UINT UsedSize; PVOID Array; << reallocate if limit is reached, copying from old array.} DYNAMIC_POINTER_ARRAY;
Could release cached empty resources every minute so.
StateHistory: each entry is a pair: LUID describing where state was changed andthe acutual state.
LinkRecord -- each entry is a pair: LUID describing where the link was made andthe actual object linked to.
10/09/1998 JosephJ Local variable used to verify that all locks claimed were released. Root task id can be used in logging.
Initially label all assert cheking in retail -- log number of asserts hit in a global variable.
Keep all static info about an object together -- no need to get lock when looking at that data.
Does it make sense to simply use InterlockedIncrement/Decrement to maintain refcounts -- not require locking?
10/09/1998 JosephJ Review outline
14 slides
1394 - 1394 bus review - 1394 bus, key characteristics (1 slide) - addressing (1 slide) - arbitration (1 slide)* - startup sequence (1 slide) - 1394 Bus API review - illustration (1 slide)* - illustration, list of apis (1 slide) ip/1394 - spec review - overiew (1 slide) - Network-capabile nodes implement the "NETWORK_CHANNELS" register at hardcoded FIFO address 0xFFFF F000 0234 - special "default" channel used for broadcast - the default channel is identified after bus reset and written to the NETWORK_CHANNELS register of all network-capable nodes.
- encapsulation format (1 slide) - arp packet (1 slide) - mcap request/response packet (1 slide) - our architecture - goals (1 slide) - NT5 & W98 support - multi-protocol support - sound design, emphasis on testability and diagnostic support - Available to public when NT5 ships - overview (1 slide)* -diagram showing components - arp/mpcm interface details (1 slide) - mpcm/bus interface details (1 slide)* - installation (1 slide)* - testing & diagnostics (1 slide) - 1394-specific miniport tests - arp module tested using tcp/ip tests - (maybe) component tests for segmentation-and-reassembly - netmon support
11/06/1998 JosephJ Resource tracking each object has a bitmap of "static" resources plus a pointer to a table which provide more info about these static resources.
typedef struct { ULONG uTag; PFN_RESOURCE_HANDLER pfnHandler; } RESOURCE_TABLE_ENTRY;
typedef struct { ULONG uTag; UINT uNumEntries; RESOURCE_TABLE_ENTRY *pTable; } RESOURCE_TABLE;
RESOURCE_TABLE GlobalResourceTable = { {'NtOb', arpDevObjHandler}, {'IpRg', arpIPRegisterHandler} {'NdPr', arpProtocolRegistrationHandler} }
AdapterResourceTable InterfaceResourceTable
ResourceManagement
RmAllocateResource( RESOURCE_HEADER *pParentResource,);typedef NDIS_STATUS RM_STATUS;
arpDevObjHandler( cmd ){ NTSTATUS Status;
if (cmd->op == ALLOCATE) { CreateFile CreateSymbolicLink } else if (cmd->op == FREE) { } else if (cmd->op == Dump) { }}
typedef struct RESOURCEMAP{ ULONG Map;}
RmAllocateResourceRmSyncAllocResourceRmFreeResourceRmSyncFreeResourceRmSyncFreeAllResources
RmLockResourceRmUnlockResourceRmUnlockAllResources
RmLinkResourcesRmUnlinkResourcesRmTmpReferenceResource
RmAllocateCollectionRmEnumerateCollectionRmFreeCollectionRmSearchCollectionRmAddItemToCollectionRmRemoveItemFromCollectionRmInvalidateItemInCollectionRmValidateItemInCollection
RmAllocTaskRmFreeTaskRmStartSubTaskRmCompleteTaskRmAbortTaskRmDumpTaskRmChainTask
RM_STATUSRmAllocateResource( pParentResource, ULONG ResourceID,); pParentResource->AllocatedResources |= (1<<ResourceID); CMD Cmd; Cmd.Op = ALLOCATE; Cmd.Parent = pParentResource; status = (pParentResource->ResourceTable->Table[ResourceID]) ( &Cmd );
ULONG RmFreeResource( pParentResource, ULONG ResourceID)
Resource-tracking -- use variable-length hash table:
Candidates for hash table--ArpCache, DbgResourceTrackingCache,
read or write lock - update stats - compute hash SLIST_ENTRY pHash->Table[hash] for(... pentry = pentry->next) { if(*(UINT)(pb+key_offset) != Key) { if (comparison-function(....)) { break; } } } if (found) { }
Refcounting: increments tmpref before returning a found item.
LinkObjects(pA, pB, uint relationID){ pA->ref++ pB->ref++
#if DBG ASSERT(pA->root == pB->root)
{ Lock(pA->root->tracker_lock); RegisterResource(pA, <link relation, relationID, pB); RegisterResource(pB, <inv-link-relation, relationID, pA); Unlock(pA->root->tracker_lock); } #endif
} 12/03/1998 Note that the win98 version specifies our bind-adapter in the ndis protocol characteristics, while the nt version specifies it in the call to IPRegisterARP.
12/18/1998 Rm support for "groups" -- groups (lists) of objects with one primary key to search, and whose life is tied to their presence in the group. Rich enumeration functionality.
RmAllocateGroup RmLookUpObjectInGroup RmDeleteAllObjectsInGroup(pGroup,pTask) RmDeallocateGroup
Locking: tasks-allocators, groups, etc, have their own locks, which are only used by the rm apis, and never locked *across* APIS. This allows them to be used independently of any other locks that may be held. For simplicity, we can have a single "rm_private_lock" for this purpose.
1/11/1999 JosephJ -- preallocate critical tasks so we don't get stuck while unloading. 1/16/1999 JosephJ -- think about using the resource tracking apis, as well as implementing the extra checking in the LinkObjects code above.
2/8/1999 JosephJ Re-think the allocation of tasks ... - allocation handled by user, allowing user to embed tasks in objects, add specialized fields and so on. - no "private context" -- any private context is expected to be allocated by the user. Typically each task consists of the standard task header followed by any private data.
Todo: 1. revise task apis to reflect above change. 2. revise tests
2/11/1999 JosephJ Decide to claim both pOtherTask and pTask's locks (in order) in PendTaskOnOtherTasks. It is possible to deadlock if pTaskA tries to pend to pend on pTaskB at the same time that pTaskB tries to pend on pTaskA, but that is not a valid thing to try to do anyway.
Of course, one thing we can do is to 1st lock the pointer that is greater in value.
Status = arpInitInterface(pIF, pSR); Status = arpCallIpAddInterface(
E:\nt\public\sdk\inc\ipexport.h 2B2A == General failure.
ip\init.c: // // Return the other handler pointers // *IpAddInterfaceHandler = IPAddInterface; *IpDelInterfaceHandler = IPDelInterface; *IpBindCompleteHandler = IPBindComplete; #if P2MP KdPrint(("IPRegisterArp: Passing Link callups\n")); *IpAddLinkHandler = IPAddLink; *IpDeleteLinkHandler = IPDeleteLink; #endif *IpChangeIndex = IPChangeIfIndexAndName; *IpReserveIndex = IPReserveIndex; *IpDereserveIndex = IPDereserveIndex;
Failing in IPAddInterface in call to IPAddNTE.
In IPAddNTE, *after* calling RegRtn (which is our DynRegister, which succeeds)
Hit the following: A13: !ASSERT( Status != NDIS_STATUS_PENDING ) L:1123,F:rm.c Fix: remove asserts and dealocate(task) if state == ENDING.
2/22/1999 JosephJ Fast Send Path
Use of RouteCacheEntry. We (arp module) has use of RouteCacheEntry.rce_context, (private\inc\ip.h) which is of size RCE_CONTEXT_SIZE, which is defined to be 2*sizeof(void*).
So we can hold 2 pointers there.
RCE is valid memory from the point it shows up in our iptransmit function until it is invalidated by a call to our invalidate-rce function.
In order to make the fast-send-path as fast as possible, but still allow for invalidating the RCE when the mapping from IP->VC breaks down, we'll use the RCE as in atmarpc.sys: it contains (a) ptr to a pIP structure and (b) pointer to the next RCE entry associated with the same pIP structure.
However, to speed things up, pIP will contain a pfnTransmit function which will be set to a fast-transmit-function when conditions are ideal (mapping from pIP to pVC exists, valid pVC). pfnTransmit will be set to other transmit functions if the conditions are less-than-ideal. These functions will queue the packet if registration is in progress, or may fail the packet if IP entry is in the process of being aborted.
2/23/1999 JosephJ Task params One option is to initialize the private portion of the task with whatever paramters required *before* calling RmStartTask -- no need to pass in those paramters using the single UserParam field.
2/23/1999 JosephJ RmUnloadAllObjecsInGroup:
New rm function RmUnloadAllObjecsInGroup: internally creates a task and in the context of that tasks, unloads all the objects in the group one-by-one.
One cool feature is that if RmUnloadAllObjectsInGroup is called several times on the same group, the "correct" thing happens: all will complete after all the objects are unloaded.
2/23/1999 JosephJ Timers To get exactly-once and proper abort semantics, consider calling the timer handler with the object's lock held.
2/29/1999 JosephJ TODO: -- create groups for the following: - local-addresses (including bcast and mcast entries) - destinations (both channels and fifos)
Note: Vcs are owned by destination only.
Basic ARP process: Lookup IP address; if (not yet registered) { queue packet on ip entry;// discard early pkts if queue full. if (no registration in progress) { begin registration task} } } else // registered { get destination object; if (destination has vc) { if (not yet connected) { queue on vc to be connected; } else if (closing down) { discard packet } else { send packet on vc } } else { // destination has no vc if (destination blacklisted) { discard packet } else { queue packet on distination; {create vc} {initiate task to make call on vc} } } }
3/1/1999 JosephJ Summary of associations: Instead of separately tracking who's linked to who, who is a parent/child of who, which tasks are running, etc., and also to allow arbitrary associations to be made (and later unmade), I introduced the concept of "associations", which are triples: The association is defined by the triple (Entity1, Entity2, AssociationID) -- only ONE such tuple may be registered at any time with object pParentObject. Note: It is valid for both of the following to be registered at the same time: (a, b, 1) and (a, b, 2) No association should exist at the point the object is deleted.
Associations are implemented using a hash table, which is located in the diagnostic-info part of an object.
3/1/1999 JosephJ Associations and debugprinting Added support for printing information about all outstanding associations for a particular object. The format of the display is controlled by the caller of RmDbgAddAssociation -- the caller passes in an optional format string to be used when displaying the association.
ARPCB_VC, *PARPCB_VC;ARPCB_DEST, *PARPCB_DEST;ARPCB_LOCAL_IP, *PARPCB_LOCAL_IP;ARPCB_DEST_IP, *PARPCB_DEST_IP;
3/2/1999 Josephj KD extensions
!rm obj 0x838c7560 -- object !rm tsk 0x838c7560 -- task !rm asc 0x838c7560 -- associations !rm grp 0x838c7560 -- group !rm sr 0x838c7560 -- stack record
!rm obj 0x838c7560
Object 0x838c7560 (LocalIP) Hdr Sig :A13L State:0xc4db69b3 Refs:990 pLock: 0x838c7560 pSIinfo:0xfdd0a965 pDInfo :0xd54d947c pParent: 0x2995941a pRoot:0x060af4a8 pHLink :0xce4294fe HdrSize: 0x123 Assoc:909
!rm tsk 0x838c7560 -- task
Object 0x838c7560 (Task: Initalize IF) Hdr Sig :A13L State:0xc4db69b3 Refs:990 pLock: 0x838c7560 pSIinfo:0xfdd0a965 pDInfo :0xd54d947c pParent: 0x2995941a pRoot:0x060af4a8 pHLink :0xce4294fe HdrSize: 0x123 Assoc:909 TskHdr pfn: 0x5399424c State:0x812d7211(IDLE) SCtxt:0x050eefc4 pBlkTsk:0x377c74bc lnkFellows:0x2b88126f Pending Tasks 0x84215fa5 0xb51f9e9e 0x9e954e81 0x696095b9 0x0c07aeff
!rm asc 0x9ba265f8 Associations for object 0x838c7560 (LocalIP): Child of 0x010091A0 (Globals) Parent of 0x00073558 (Task2) Parent of 0x00073920 (Task3a) Parent of 0x000739F8 (Task3b)
!rm grp 0x838c7560
Group 0x4d650b98 (LocalIP Group) of object 0x11eafd78 (Interface) Num:11 State:ENABLED pSInfo: 0x944b6d1b pULTsk: 0x8c312bca Members: 0x8db3267c 0xa639f663 0x8f3530a6 0xa4bfe0b9 0x995dd9bf 0x61e1344b 0xd6323f50 0x606339fd 0x2e8ed2a4 0x62e52f27 0xa82b59ab
!rm sr 0x838c7560
Stack Record 0x838c7560 TmpRefs: 2 HeldLocks: 0xe916a45f 0x23d8d2d3 0x5f47a2f2
03/03/1999 JosephJ
All the above dbg extensions are implemented to a T (well I don't dump the list of held locks). Associations work like a charm.
The amazing thing is that after I got this to work with the user-mode test environment, it worked perfectly in the real kd environment -- everything was just perfect, including the rather hairy dumping of associations.
Following is real output from kd:
kd> !rm obj 0xFF8EFD68
Object 0xFF8EFD68 (INTERFACE) Hdr: Sig:0x69333141 State:0x80000001 Refs:0x00000002 pLock:0xFE723990 pSInfo:0xFDB22438 pDInfo:0xFF94E628 pParent:0xFE723948 pRoot:0xFDB22480 pHLink:0xFF8EFDA8 HdrSize:0x00000048 Assoc:5kd> !rm asc 0xFF8EFD68
Associations for 0xFF8EFD68 (INTERFACE): IP IF Open Child of 0xFE723948 (Adapter) Owns group 0xFF8EFDF8 (LocalIp group) Owns group 0xFF8EFE3C (RemoteIp group) Owns group 0xFF8EFE80 (Destination group)
....kd> !rm grp 0xFE6A1CB8
Group 0xFE6A1CB8 (LocalIp group) of object 0xFE6A1C28 (INTERFACE) Num:0x00000000 State:ENABLED pSInfo:0xf926d350 pULTsk:0x00000000 No members.
03/04/1999 JosephJ MCast address adds/removes. From IP/ATM code, we see that we may get multiple adds for the same address, and hence we need to maintain ref counts on these entries.
This is not the case for unicast addresses.
Since I am treating all types of IP addresses the same as far as liveness is concerned, I will keep add/remove ref counts for all types.
03/04/1999 JosephJ Adding custom information to !rm obj, tsk Some way to identify a function to call (in user mode) that knows how to print custom information about the specific instance. Eg: > tsk 0x000732C8 Task 0x000732C8 (TaskO2) Hdr: Sig:0x6154524d State:0x80000000 Refs:0x00000004 ... Pending tasks: 0x00073848 0x000736D0
Waiting for NdisInitializeAdapter(MP=0x923450900) to complete.
03/04/1999 JosephJ "Verbose" mode for grp Currently, only the pointers to the mebers are printed, 4 to a line. In verbose mode, switch to one line per member, and allow custom printing of member information. Eg (for LocalIP entries): 0xFE723948 169.240.233.001 RESOLVED
03/04/1999 JosephJ ASSERT_SAME_LOCK_AS_PARENT Defined the above macro to assert the case that an object uses the same lock as it's parent.
03/04/1999 JosephJ Verifying things aren't changed when an object is unlocked. Partial support for is already in the RM api's (the pfnVerifier function stuff). We should condider actually using it earlier on the development phase so that we catch problems sooner. We need to change RM api's (RmLock/UnlockObject) so that they compute a checksum on entry and exit -- see earliest entry in this log. Basic algorithm: RmWriteLockObject(pObj,) { Lock object CurrentState = pfnObjVerifier(pObj, fLock==TRUE); ASSERT(CurrentState == pObj->LastSavedState); }
RmUnlockObject(pObj) { pObj->LastSavedState = pfnObjVerifier(pObj, fLock=FALSE); Unlock object. }
03/04/1999 JosephJ Comments on LocID LocID is a 32-bit (typically random) number that identifies a point in the source code. I prefer this to saving line/file numbers because: 1. 32-bit number is easier to carry around. 2. It's more robust w.r.t. code changes -- simply grep for that number. On the downside, you need to make sure that the LocIDs are unique -- easy to screq up if you cut and paste code. In unimodem, I has a very elaborate scheme that would scan all sources and build a logging C++ file which would only compile if the IDs were unique. A simpler script could extract the places where these are declared and do a simple check for uniqueness.
03/04/1999 JosephJ Problems with deadlock when using Groups. Unfortunately, specifying the RM_LOCKED option could cause deadlock, especially the object being looked up does not have its own lock but instead is using its parent's lock. Need to find the proper solution to this.
03/04/1999 JosephJ Size of the context passed in ArpIpQueryInfo. Traced this (looking at ip and tcp sources and index1) to private\inc\tdiinfo.h (DON'T use tcpipmerge\h\tdiinfo.h, which is for win9x). The structure used is TCP_REQUEST_QUERY_INFORMATION_EX.Context, which is defined as: #define CONTEXT_SIZE 16 ULONG_PTR Context[CONTEXT_SIZE/sizeof(ULONG_PTR)];
So basically we have 4 DWORDS, which is 4ptrs in 32-bit and 2ptrs in 64-bit.
03/04/1999 JosephJ Implementing ArpIpQueryInfo. We need a mechanism that will deal with our plan to use dynamically-resizable hash tables. Solution: simply put the IP address in the context. We can add an Rm API: RmGetNextObjectInGroupByKey(,...pKey...), which will lookup an object that matches pKey and gets the object after it. It fails if it doesn't find the object with pKey, or if there is no object after the object with the given key, OR if there has been a hash table resize. How do we know if there has been a hash table resize? Hmm.... We may want to add a UINT HashTableGeneration to GROUP, and add the Generation to the context.
03/04/1999 JosephJ Populating the arp cache with static arp entries. Good to do this for it's final functionality but also to get the bootstrap going.
For now, just get them from an internally-compiled table. Later think about adding them via the standard mechanism.
03/04/1999 JosephJ Implementing ArpIpQueryInfo (contd...)
Following are the structures returned. atmarpc.sys (arpif.c) simply declared a local char array of sizeof(IFEntry) -- since it's clearly the largest. We should probably define a union -- see later down..
#define MAX_PHYSADDR_SIZE 8
private\inc\llinfo.h typedef struct IPNetToMediaEntry { ulong inme_index; ulong inme_physaddrlen; uchar inme_physaddr[MAX_PHYSADDR_SIZE]; ulong inme_addr; ulong inme_type; } IPNetToMediaEntry;
private\inc\ipinfo.h typedef struct AddrXlatInfo { ulong axi_count; ulong axi_index; } AddrXlatInfo;
private\inc\llinfo.h typedef struct IFEntry { ulong if_index; ulong if_type; ulong if_mtu; ulong if_speed; ulong if_physaddrlen; uchar if_physaddr[MAX_PHYSADDR_SIZE]; ulong if_adminstatus; ulong if_operstatus; ulong if_lastchange; ulong if_inoctets; ulong if_inucastpkts; ulong if_innucastpkts; ulong if_indiscards; ulong if_inerrors; ulong if_inunknownprotos; ulong if_outoctets; ulong if_outucastpkts; ulong if_outnucastpkts; ulong if_outdiscards; ulong if_outerrors; ulong if_outqlen; ulong if_descrlen; uchar if_descr[1]; } IFEntry;
union { AddrXlatInfo AddrInfo; IPNetToMediaEntry ArpEntry; IFEntry Stats; } InfoBuf; ...
Need to get the adapter info -- stuff in arpGetAdapterInfo, to fill out the above structure.
WIN98: Win98 doesn't like more than 6 chars for IFEntry.if_physaddrlen, although it does tolerate more (at-least-7) in AddrXlatInfo.inme_pysaddrlen.
WIN98 also takes at-leat-7 for LLIPBindInfo.lip_addrlen (IpAddinterfaceRtm)
NT pIFEntry->if_physaddr <- set to MAC address (6 bytes) + SAP Sel(1 byte) W98 pIFEntry->if_physaddr <- set to MAC address (6 bytes, munged due toELAN) LLIPBindInfo.lip_addr <- set to ATMAddress starting at ESI offset (7 bytes) IPNetToMediaEntry.inme_physaddr <- dest atm addr at ESI offset (y bytes)
Any reason why pIFEntry->if_physaddr would be different from BindInfo->lip_addr?
MacAddress seems to be used ONLY for pIFEntry.
03/05/1999 JosephJ Thoughts on logging.. - Log fixed-sized entries (taken from a global list, just like the association free-list -- well associations today used alloc's but that'll change). - Logs maintained per-object. - Log-entry recovery strategy: -- all object's log entries deleted when the object is deleted. -- If global log entry pool goes empty, then... if (the object's log is larger than some threshold) { we reuse the oldest log entry for that object } else { the oldest log entry in the globally-threaded list of log entries entry is reclaimed. } - KD extensions as well as IOCTLs to display an object' state and logs.
03/05/1999 JosephJ Ideas on using the same code for kd extensions AND IOCTL dump Seems possible to use the same code to both collect and dump information in KD and from a user mode app that does IOCTLs to the device object representing the driver -- after all, conceptually the same thing is going on: there is a memory-space transition.
This is well worth exploring since then once you write an extension, the IOCTL support will essentially come for free!
Unfortunately, we shouldn't allow the user mode app to read arbitrary memory from kernel-mode -- so we have to think about this some more.
03/05/1999 JosephJ Strategy for managing ip/1394 encapsulation header buffers Keep a fixed-sized, pre-initalized pool of these, and simply queue the packet if you run out. More precicely, the send-path would look like: Fast path case (vc available for sending, and no pkts queued waiting for bufs): if (can-back-fill) { backfill and send } else { if (allocate header buf succeeds) { chain and send } else { switch send handler to slow path; queue pkt in waiting-for-bufs queue } }
03/05/1999 More corny locking problems when parent and child share a lock. Sometimes we'd like to do the following: Lock(pParentObj) ...... Create pChildObject call Func(pChildObject); // pChildObject's lock released on return from Func
So RmWriteLock gets called with pParent, and RmUnlock gets called with pChild. But RmWrite (extra-checking-version) saves some context of the pParent object, so that effectively, it uses the parent's context when freeing the lock; So the parent's verifier is called, not the child's.
This will actually work, but is quite strange behavior which is not at all obvious by the call to RmUnlockObject(pChild).
We'll live with this for now -- see for example the code in ArpIpAddAddress.
But there is a problem when we implement verification of state preservation across locking: Since pChild's verifier function is not called on exit, we will assert the NEXT time we try to lock pChild!
The fix is for RmUnlockObject to call the verifier for pParent(UNLOAD), followed by calling verifier for pChild(LOAD), if it detects that the object being unlocked is not the same as the object being locked (it can do this by looking into the LOCKING_INFO context).
A bit tricky, but this is fairly clear semantics.
03/05/1999 Locking problems, continued... Implemented new function RmDbgChangeLockScope which does the things described above (only if RM_EXTRA_CHECKING is defined, of course).
Also now RmUnlockObject checks to make sure that the RM_LOCKING_INFO.pVerifierContext is a pointer to the object being unlocked.
03/07/1999 JosephJ Thoughts on location of kdextension sources To help things stay in synch, consider keeping a subdir .\kd, which has the kd extension code that is sensitive to privately-defined structures. This code is actually compiled as part of the debug build of the main component -- this will force the code to stay in synch. The kd extension dll (which needs to be in another directory) would need to includes these files by reaching over into this directory.
03/07/1999 JosephJ Need to move rm-private state out of Hdr.State
Since object-specific info is protected by pHdr->pLock, while rm-private state is protected by the pHdr->RmPrivateLock, we can't have both of them use pHdr->State; So we need to move rm-private state into its own DWORD. This DWORD is dwRmState;
03/07/1999 JosephJ Registering root objects with RM
We need to have a mechanism to register root objects with RM, so that multiple components (eg. arp1394 and nic1394) can use the RM apis. Currently, the primary reason for doing so is to maintain separate global logs for each component. Another parameter is the "InterfaceGuid" to uniquely identify the component to match up with object-specific information for KD extension dumping. More things may need to be added on a per-component basis.
We have to do some work/re-specification of APIs to allow for a single binary that would work for components which have/have-not defined RM_EXTRA_CHECKING.
typedef struct { GUID InterfaceGUID; #if RM_EXTRA_CHECKING UINT NumDbgLogEntries; PFN_RM_MEMORY_DEALLOCATOR pfnDbgLogBufDeallocator; #endif // RM_EXTRA_CHECKING } RM_GLOBAL_INFO, *PRM_GLOBAL_INFO;
typedef struct { RM_OBJECT_HEADER Hdr; PRM_ROOT_INFO pRootInfo; LIST_ENTRY linkRegisteredEntries;
} RM_ROOT_OBJECT_HEADER;
RmInitializeRootObject( IN PRM_ROOT_OBJECT_HEADER, PRM_ROOT_INFO pRootInfo; ... ) { if (InterlockedCompareExcahnge(RmGlobal_Initialized, 1, 0)) { // Do one-time initialization, including lock and list of // global entries. }
// Add component to global list of registered components. }
RmDeinitializeRootObject( IN PRM_ROOT_OBJECT_HEADER, ..., ) { // look for an deinitialize component
// with global lock held if (last-registered-entry) { // free any globally allocated resources, except of // course the global lock itself. } }
03/07/1999 JosephJ Thoughts on the obect verifier function... To help ensure that no one is READING a piece of data when the object lock is not held, the verifier can reverse the bits of the data on unlocking and flip them back on locking.
03/08/1999 JosephJ Implemented object logging! Key features: -- Fixed-sized log entries (RM_DBG_LOG_ENTRY) -- Each entry has two LIST_ENTRYs: to be a link in the object's list of log entries and the global list of log entries. -- Logging to the object consists of allocating a log entry and inserting it in the head of the object's log list and the global log list. -- On deallocation of the object, we free all the entries in object's log. -- Provision to add a buffer to the entry which is freed when the entry is removed from the log -- for cases where the things being logged may go away when the object is still alive.
Types: PFN_DBG_DUMP_LOG_ENTRY -- allows customized display of log entries RM_DBG_LOG_ENTRY -- the fixed-size log entry. Functions: RmDbgLogToObject -- make an entry in the object's log RmDbgPrintObjectLog -- dump the object log to dbgout RmDbgPrintGlobalLog -- dump the global log to dbgout.
In order to initialize the global log list, I added the following two RmApis: RmInitializeRm -- call 1st, before any other rm api. RmDeinitializeRm -- call after last rm api, and all async activity complete.
The above functionality is all implemented and tested via the usermode tests in .\tests.
Note: Once multiple components are using the RM api's, we'll need a more sophisticated registration mechanism -- see 07/07/1999 entry "Registering root objects with RM"
03/09/1999 JosephJ Consider making init functions fail etc if associated object is deallocated.
We could fail RmInitializeHeader/Task if the parent object is in the deallocated state. However, I'm not sure if it buys us anything -- after all, as soon as you return from successful RmInitializeHeader, someone could call RmDeallocateObject on the parent, and you get the same result as if the parent was already deallocated and we didn't check in RmInitializeHeader.
What we really want is exact semantics on unloading/deallocating objects.
03/09/1999 Special allocator for unload-related tasks It's ugly for task allocation to fail as part of unloading an object. To address this, we should consider special allocation/deallocation for unload tasks, that must be called at passive level and will block until a free unload-task becomes available.
03/10/1999 JosephJ "Arp -a" works; Sample kd and arp -a output...
kd> !e:\nt\kd\a13kd\a13kd.rm obj 0xFE65F008 Loaded e:\nt\kd\a13kd\a13kd extension DLL Object 0xFE65F008 (INTERFACE) Hdr: Sig:0x49333141 State:0x00000002 Refs:0x0000000d pLock:0xFE7009F4 pSInfo:0xFD8C1490 pDInfo:0xFF8C9AE8 pParent:0xFE7009A8 pRoot:0xFD8C14E0 pHLink:0xFE65F04C HdrSize:0x0000004c Assoc:16 RmState: O_ALLOC kd> !rm asc 0xFE65F008 Associations (50 max) for 0xFE65F008 (INTERFACE): IP IF Open Child of 0xFE7009A8 (Adapter) Owns group 0xFE65F0CC (LocalIp group) Owns group 0xFE65F110 (RemoteIp group) Owns group 0xFE65F154 (Destination group) Parent of 0xFF8D7288 (RemoteIp) Parent of 0xFE691568 (Destination) Parent of 0xFE6686C8 (RemoteIp) Parent of 0xFF92A648 (Destination) Parent of 0xFF8EE868 (RemoteIp) Parent of 0xFF92A848 (Destination) Parent of 0xFE663268 (RemoteIp) Parent of 0xFE667CE8 (Destination) Parent of 0xFF8F18C8 (LocalIp) Parent of 0xFF8B99C8 (LocalIp) Parent of 0xFF8B9EA8 (LocalIp) kd> !rm log 0xFE65F008 Log entries for 0xFE65F008 (INTERFACE) (18 of 18): Del assoc: Parent of 0xFF932288 (Task: Initialize Interface) Add assoc: Parent of 0xFF8B9EA8 (LocalIp) Add assoc: IP IF Open Add assoc: Parent of 0xFF8B99C8 (LocalIp) Add assoc: Parent of 0xFF8F18C8 (LocalIp) Add assoc: Parent of 0xFE667CE8 (Destination) Add assoc: Parent of 0xFE663268 (RemoteIp) Add assoc: Parent of 0xFF92A848 (Destination) Add assoc: Parent of 0xFF8EE868 (RemoteIp) Add assoc: Parent of 0xFF92A648 (Destination) Add assoc: Parent of 0xFE6686C8 (RemoteIp) Add assoc: Parent of 0xFE691568 (Destination) Add assoc: Parent of 0xFF8D7288 (RemoteIp) Add assoc: Owns group 0xFE65F154 (Destination group) Add assoc: Owns group 0xFE65F110 (RemoteIp group) Add assoc: Owns group 0xFE65F0CC (LocalIp group) Add assoc: Parent of 0xFF932288 (Task: Initialize Interface) Add assoc: Child of 0xFE7009A8 (Adapter) kd> !rm grp 0xFE65F154 Group 0xFE65F154 (Destination group) of object 0xFE65F008 (INTERFACE) Num:0x00000004 State:ENABLED pSInfo:0xfd8c1380 pULTsk:0x00000000 Members: 0xFE667CE8 0xFE691568 0xFF92A648 0xFF92A848 kd>
ARP -A output from josephj1E... E:\> arp -a Interface: 172.31.241.214 on Interface 0x2 Internet Address Physical Address Type 172.31.240.1 00-10-11-60-d1-40 dynamic Interface: 192.168.75.1 on Interface 0x3 Internet Address Physical Address Type 10.0.0.11 01-00-00-00-00-00-00 static 10.0.0.12 02-00-00-00-00-00-00 static 10.0.0.13 03-00-00-00-00-00-00 static 10.0.0.14 04-00-00-00-00-00-00 static E:\>net stop atmarpc The ATM ARP Client Protocol service was stopped successfully. E:\>net start atmarpc The ATM ARP Client Protocol service was started successfully.
03/10/1999 JosephJ Encapsulation buffer management design
Apis:
NDIS_STATUS arpInitializeEncapsulationHeaderPool( IN UINT Size, IN const *pvMem, IN UINT cbMem, IN PRM_OBJECT_HEADER *pOwningObject, OUT ARP_ENCAPSULATION_HEADER_POOL **ppPool, IN PRM_STACK_RECORD pSR );
VOID arpDeinitializeEncapsulationHeaderPool( IN ARP_ENCAPSULATION_HEADER_POOL **ppPool, IN PRM_STACK_RECORD pSR ); PNDIS_BUFFER arpAllocateEncapsulationHeader( ARP_ENCAPSULATION_HEADER_POOL *pPool );
VOID arpDeallocateEncapsulationHeader( ARP_ENCAPSULATION_HEADER_POOL *pPool PNDIS_BUFFER pBuffer );
03/11/1999 RM api enhancements -- more on root objects (see 03/07/1999 entry "Registering root objects with RM") RootObjects should be an extended hdr structure, with the following info -- list of tasks (for debugging only) -- "name space GUID", used by kd to load custom information about all the objects under the GUID. -- Global log (one per root object). typedef struct { RM_OBJECT_HEADER Hdr; LIST_ENTRY listTasks; LIST_ENTRY listLog; ... } RM_ROOT_OBJECT_HEADER;
03/11/1999 RM api enhancements -- special "unload object" tasks. -- Given the similarity of the way shutdown tasks are handled, especially the way they deal with existing shutdown tasks, we should consider shutdown tasks to be a special kind of tasks with an extended task header (below). Also, have a field in all objects to hold THE shutdown task. The RmApis can implement the logic of waiting on THE shutdown task, etc. MOREOVER, it can then support the concept of PARALLEL unload, because it can use the extra fields in the extended shutdown task header to store stuff (LONG to be interlocked- decremented and if zero a task to be un-pended). typedef struct { RM_TASK_HEADER TskHdr; LONG TasksLeft; << interlock-decrement this and if 0 ... PRM_TASK pCoordinatingTask; << ... unpend this task. } RM_SHUTDOWN_TASK;
The object's unload task handler will be only called once, regardless of howmany times someone requests to unload the object -- this is supported by a new Rm API, something like: RmUnloadObject(pObj, OPTIONAL pTask,...) -- if pTask NULL, will block. (also the existing RmUnloadAllObjectsInGroup)
Since the handler function will only be called once, it can be simplified -- the code to deal with existing handler-functions can be taken out.
03/11/1999 RM api enhancements -- stastics gathering(if RM_EXTENDED_CHECKING enabled) For the following - per root object (global stats) - per object Stats (current, tot, max) - tasks allocated - object age (how long it's been around) - number of children allocated
For Groups (current, tot, max) -we already maintain some group stats -- rough number of accesses and number links travesed (since it's munged (scaled down), this is not really a true number). - Number of adds/deletes/lookups - Number of members - Links traversed - Some idea of how long objects live in the group (age can be determined at the time the object is deallocated) - best would be a histogram, say of multiples of 16 ms (8 DWORDS) <=1ms, <=16ms, <=256ms, <=4s, <=65s(~1m), <=1Ks(16m), <=16Ks(4h), >.. - quick to compute histogram index: 16-char array L2 of log_2(nibble): PUCHAR *puc = (PUCHAR) &val; UINT Index = (L2[puc[0]]+(L2[puc[1]]<<4)+(L2[puc[2]]<<8)+(L2[puc[3]]<<12))>>2;
03/11/1999 JosephJ Implemented and tested (in user mode) const buffer APIs See 03/10/1999 entry "Encapsulation buffer management design" The APIs have been renamed as follows arpInitializeConstBufferPool arpDeinitializeConstBufferPool arpAllocateConstBuffer arpDeallocateConstBuffer .\tests\tarp.c (function test_ArpConstBufferPool) tests the above functions in usermode.
03/11/1999 JosephJ Win98 -- BACK_FILL is disabled in atmarpc.sys So we have to keep the #if BACK_FILL code.
03/11/1999 JosephJ Ideas on logging enhancements - Integrate debug logging with object logging -- single logging model that optionally goes to object log and/or debug log. (So for example a lot of stuff can get logged to the object logs, without choking up the debugger). - Verbosity controlled on multiple basis: - per-object - per stack_record - per module - Add a SINGLE_LIST_ENTRY to the log entry for stack_record logging -- to be able to dump all log entries made when a particular stack record is in scope. - rather than trying to properly deal with stack_records and/or objects going out of scope, we simply add the log entry to the HEAD of the stack-record list. This way we don't have to worry if log entries already in the stack-record log are still alive (note we would need to know that if we were using the doubly-linked SLIST_ENTRY). - The kd extension would have to deal with the fact that some of the entries may be deallocatd. 03/12/1999 JosephJ RouteCacheEntry information: From: Joseph Joy Friday, March 12, 1999 7:43 AM Subject: questions on arp RouteCacheEntry semantics
NK, Are the semantics of RouteCacheEntry passed in to the arp module's lip_transmit routine documented anywhere? [Nk Srinivas] Document ???? ;-) If not, can you answer the following questions? (I need this for my ip/1394 arp implementation). 1. From the 1st time we see a particular RCE (with arp context portion all zeros) until the point the arp modules lip_invalidate handler is called, can we assume that the rce will always refer to the same destination IP address? [Nk Srinivas] Yes. 2. Is it possible for the lip_transmit routine to be re-entered for a send with the same RCE -- i.e., two or more concurrent calls made to lip_transmit specifying the same RCE? [Nk Srinivas] yes. 3. Is #2 is true, can we assume that the FIRST time a particular RCE is specified in lip_transmit, lip_transmit will NOT be reentered with the same RCE until the former call to lip_transmit returns? (I hope so). [Nk Srinivas] No. same rce will be passed in every call. 4. In practice, under moderate to heavy loads, can I assume that the vast majority (>99%) of lip_transmit calls are made with a non-NULL RCE? [Nk Srinivas] [...] *All* tcp/udp/raw traffic uses RCE. Only icmp/igmp do not use rce.
03/12/1999 JosephJ RouteCacheEntry use; fast send path design VERSION ONE
ArpIpTransmit(...){
if (pRCE->context != NULL) { lock IF send lock get pIpEntry from pRCE if (can send immediately) // this includes the fact that there are // no pkts queued waiting for buffers! { fRet = fast_send(&Status, pPkt, pVc); // send-lock released if (fRet) return Status; // EARLY_RETURN // else were out of resources, we probably need to queue pkt } unlock IF send lock } arpSlowIpTransmit(......)}
arpSlowIpTransmit(...){
if (pRCE->context == NULL) // again { lookup/create RemoteIp entry ASSERT_NOLOCKS() get IF send lock if (pRCE->context == NULL) // is it still null? { setup pRCE->context; } else { // no-longer null -- this means that someone else has already // initialized it. pTmpRemoteIp = pRemoteIp; pRemoteIp = pRCE->context; tmpref(pRemoteIp); tmpderref(pOldRemoteIp); } release IF send lock; }
ASSERT_NOLOCKS
if (pRemoteIP == NULL) { fail pkt. } else { // we've got a pRemoteIp, with a ref to it, and no locks. get IF set lock if (can send immediately) { fret = fast_send(....); if (!fRet) { // we're out of resources, queue pkt on IF's pkts-waiting-for-bkts // queue. } } else { queue pkt on RemoteIp's send pkt queue. } }}
03/12/1999 JosephJ RouteCacheEntry use; fast send path design VERSION TWO In this one, we first prepare the packet, including chaining a header buffer up front, if required if we can't fast-send, we un-do the work.
// Following sits in the miniport-reserved portion of send-pkts, before they // are sent out. struct { LIST_ENTRY linkQueue;
union { struct { IP_ADDRESS IpAddress; ULONG Flags; #define ARPSPI_BACKFILLED 0x1 #define ARPSPI_HEADBUF 0x2 #define ARPSPI_FIFOPKT 0x4 #define ARPSPI_CHANNELPKT 0x8 } IpXmit; };
} ARP_SEND_PKT_MPR_INFO;
ArpIpTransmit(...) { do { if (pRCE->context != NULL) break; // slow path if (fifo_header) { fRet = prepare_fifo_header(pIF, pPkt); } else { fRet = prepare_channel_header(pIF, pPkt); } if (!fRet) break; // slow path lock IF send lock get pIpEntry from pRCE if (can send immediately) // this includes the fact that there are // no pkts queued waiting for buffers! { pVc->fast_send(&Status, pPkt, pVc); // send-lock released return Status; // EARLY_RETURN } unlock IF send lock } arpSlowIpTransmit(......) } arpSlowIpTransmit(pPkt, pLocalIp, ...) { }
03/13/1999 JosephJ New RM APIs RmResumeTaskAsync and RmResumeTaskDelayed Added the above two APIs which seem to provide a "big bang for the buck." Description: RmResumeTaskAsync -- resumes task in the context of a work item RmResumeTaskDelayed -- resumes task in the context of a timer handler.
Potential uses of RmResumeTaskAsync:
1. There is a potential problem with the way that task completion is handled, that could lead to excessive use of the stack.
The specific case where this would happen is if there are a large number of objects in a group, and their shutdown tasks all call SuspendTask and ResumeTask on themselves. What will happen is that when RmUnloadAllObjectsInGroup is called for this group, you will have the shutdown handlers for EACH object in the group on the stack (in facta couple of times each).
To avoid this pathalogical situation (which except for its use of the stack is otherwise perfectly correct), RmUnloadAllObjectsInGroup can unload each object as a separate work item.
2. If a task wants to do something at passive level and it can be sure that it is currently at passive level.
Potential uses of RmResumeTaskDelayed: 1. For debugging, to delay completion of some operation makes it extremely easy to do it). 2. If a task needs to do something after a fixed period of time -- say to send a retry after 3 seconds.
03/13/1999 JosephJ Ageing of objects The use of ageing timers can be completely hidden from the user if objects have ages and they WILL be unloaded (it's shutdown task will be started) if the age expires. The rm API RmResetAgeingTimer is used to extend the object's life.
Support for ageing of objects, plus the RmResumeTaskDelayed api described above, should pretty-much obviate the user's need for explicit timers.
03/14/1999 JosephJ Finished implementing RmResumeTaskAsync and RmResumeTaskDelayed Finished implementing and testing (in user mode) the above two functions (see 03/13/1999 entry "New RM APIs RmResumeTaskAsync and RmResumeTaskDelayed"). To test in user mode, I wrote user-mode versions of the following Ndis APIs: NdisInitializeWorkItem NdisScheduleWorkItem NdisInitializeTimer NdisSetTimer
03/16/1999 JosephJ Implemented RmLinkToExternal* and RmUnlinkFromExternal* The following are used for references to external objects, such as RCEs and packets: RmLinkToExternalFast Addrefs object RmLinkToExternalEx Debug versions of the above, adds an association RmUnlinkFromExternalFast Delrefs object RmUnlinkFromExternalEx Debug version of the above, dels an association TODO: need to make the fast versions inline, and also currently RmUnlinkFromExternalEx declares a stack-record -- it should do this only if the object needs to actually be deallocated (i.e call another function which declares a stack log)
03/19/1999 JosephJ Thoughts on cleaning up the task handlers - Separate PendCompletion-, End- and Abort-handlers. - No "UserParam", even on starting -- instead, just NDIS_STATUS. - User is expected to setup the task with any required initialization parameters *before* calling RmStartTask. - "START" is a special pend code value of (ULONG)-1, sent to the task's PendCompletion handler. - RmStartTask has return type VOID. - PendCompletion and Abort handlers have return type VOID. - Only the End handler returns NDIS_STATUS (anything besides PENDING). (This return status is passed on any tasks that may be pending on it).
The PendCompletion handler prototype becomes... typedef VOID (*PFN_RM_TASK_PENDCOMPLETE_HANDLER)( IN struct _RM_TASK * pTask, IN OS_STATUS Status, IN PRM_STACK_RECORD pSR );
RmStartTask's prototype becomes... VOID RmStartTask( IN PRM_TASK pTask, IN PRM_STACK_RECORD pSR );
03/22/1999 JosephJ Support for retail debugging or RM objects - May want to consider adding links to children and peers (4 ptrs overhead!) purely for debugging purposes. At least make it a compile option independent of DBG - Support the following RM dbgextension: !rm scantree <obj addr> <pattern> -- scans the obj at addr <obj addr> and all its children for pattern <pattern> !rm tree <obj addr> -- lists the entire tree of objects, starting at oject <obj addr>
bp atmarpc!DbgMark "dd (esp+4) l1; g poi(esp)"
03/23/1999 JosephJ Media-specific parameters is 5 DWORDs from base .... but NIC1394_MEDIA_PARAMETERS, whose 1st field is a union which includes a UINT64, needs to be 8-byte aligned! Fix? Probably redefine the UniqueID to be UniqueIDHi and UniqueIDLo
03/24/1999 JosephJ Wierdness involving MIB processing in ip.c Previously, the arp module could be net-stopped and started, but then arp, ipconfig, etc wouldn't work, and what was happening is the the reloaded arp module was being given the OLD entity instance values (from its previous life). I found that sometime after we initiate unload by calling IP's pDelInterfaceRtn, Ip calls ArpIpGetEList. At this stage (i.e. we are closing), we need to set the pAT/IFEntity->tei_instance to INVALID_ENTITY_INSTANCE to fix this problem.
03/24/1999 JosephJ Adding to fake Ndis calls: Adding more variations to the fake versions of the following Ndis calls: NdisClMakeCall NdisClCloseCall NdisCoSendPackets We need to randomly chose among the following variations: - failure OR success - async OR sync completion for make/close call - async OR sync (i.e. while NdisCoSendPackets still on stack) completion for SendPkts. - For async completion of make/close call and async completion of sendpkts, to call the completion call back in dpc OR passive level. - For async calls, delay for some random amount of time.
03/25/1999 JosephJ Implemented all of the above fake ndis call variations! Check out fake.c -- it now has a pretty elaborate mechanism for controlling the probabilities of the variations of behaviour of the fake versions of NdisClMakeCall, NdisClCloseCall and NdisCoSendPackets -- basically it allows you to specify weights of the above variations (failure/success, async/sync etc) and then generates samples based on those weights. Here's an example of how the delay amount is specified: static OUTCOME_PROBABILITY DelayMsOutcomes[] = { {0, 5}, // Delay 0ms, etc... {10, 5}, {100, 5}, {1000, 1}, {10000, 1} }; The above means that 0,10, and 100ms delays each have a weight of 5 and 1000ms and 10000ms each have a weight of 1.
TODO: May want to add jitter to the outcome values, where they make sense. It's easy to do that -- for example Val += (R*Val/32), where R is a random signed integer in the range of -8 to 8 (need to watch for overflow and boundary conditions). Anyway, I don't think this will add anything tangible (i.e. find bugs that would not have otherwise been found).
The code to generate samples based on weights, and the fake versions of the calls themselves, were first tested in user mode via the tests in tests\tarp.c (test functions test_ArpGenRandomInt() and test_arpDbgFakeCalls().) test_ArpGenRandomInt actually prints out results to show that the actual percentages match the specified weights. Here is some sample output(pretty good results!): NUM_TRIALS = 100.... Outcome=0x0; True%=0.032258; Computed%=0.020000 Outcome=0x1; True%=0.064516; Computed%=0.050000 Outcome=0x2; True%=0.129032; Computed%=0.170000 Outcome=0x3; True%=0.258065; Computed%=0.240000 Outcome=0x4; True%=0.516129; Computed%=0.520000 ... NUM_TRIALS = 10000.... Outcome=0x0; True%=0.032258; Computed%=0.034800 Outcome=0x1; True%=0.064516; Computed%=0.063300 Outcome=0x2; True%=0.129032; Computed%=0.126400 Outcome=0x3; True%=0.258065; Computed%=0.256800 Outcome=0x4; True%=0.516129; Computed%=0.518700 The core random number generator is based on Numerical Recipes ran1() -- see fake.c for details.
Today I used the above fake version of the APIs to test arp1394 -- it worked fine for basic pings, but arp1394 has just hit an assert when I tried "net start atmarpc" while pings were ongoing. So the test infrastructure is bearing fruit!
The great thing about these fake versions is that I can continue to use them in the future for regression testing of arp1394.
03/25/1999 JosephJ Ahem...above-mentioned assert is due to be a bug in fake.c
03/25/1999 JosephJ IPDelInterface should be called at PASSIVE!
Check out the following stack trace. The bugcheck happened because IPDelInterface was called at DPR level (our good-old fake close-call completion callback did this, by design). So obviously we must switch to passive before calling IPDelInterface. But this stack is an example of the potential problem I mentioned in the 03/13/1999 note "New RM APIs RmResumeTaskAsync and RmResumeTaskDelayed": 1. There is a potential problem with the way that task completion is handled, that could lead to excessive use of the stack. So basically we need to figure out key points to do a "resume task asynch." I could make "RmCancelPendOnOtherTask" do a RmResumeTaskAsync instead of RmResumeTask EXCEPT that we need a work item to do this. ntkrnlmp!KeBugCheckEx+0x12d ntkrnlmp!ExAllocatePoolWithTag+0x3f ntkrnlmp!ExpAllocateStringRoutine+0x10 ntkrnlmp!RtlAnsiStringToUnicodeString+0x48 netbt!LmOpenFile+0x3c netbt!PrimeCache+0x3d netbt!NbtResyncRemoteCache+0x8a netbt!NbtNewDhcpAddress+0xaf netbt!TdiAddressDeletion+0x70 TDI!TdiNotifyPnpClientList+0xcb TDI!TdiExecuteRequest+0x173 TDI!TdiDeregisterNetAddress+0xb tcpip!NotifyAddrChange+0xf9 tcpip!IPDelNTE tcpip!IPDelInterface atmarpc!RmResumeTask+0x129 atmarpc!RmCancelPendOnOtherTask+0x221 atmarpc!rmEndTask+0x13c atmarpc!RmResumeTask+0x1fb atmarpc!RmCancelPendOnOtherTask+0x221 atmarpc!rmEndTask+0x13c atmarpc!RmStartTask+0x201 atmarpc!rmTaskUnloadGroup+0x452 atmarpc!RmResumeTask+0x129 atmarpc!RmCancelPendOnOtherTask+0x221 atmarpc!rmEndTask+0x13c atmarpc!RmStartTask+0x201 atmarpc!rmTaskUnloadGroup+0x452 atmarpc!RmResumeTask+0x129 atmarpc!RmCancelPendOnOtherTask+0x221 atmarpc!rmEndTask+0x13c atmarpc!RmStartTask+0x201 atmarpc!rmTaskUnloadGroup+0x452 atmarpc!RmResumeTask+0x129 atmarpc!RmCancelPendOnOtherTask+0x221 atmarpc!rmEndTask+0x13c atmarpc!RmResumeTask+0x1fb atmarpc!RmCancelPendOnOtherTask+0x221 atmarpc!rmEndTask+0x13c atmarpc!RmResumeTask+0x1fb atmarpc!ArpCoCloseCallComplete+0xf8 atmarpc!arpFakeCloseCallCompletionCallback+ atmarpc!arpDbgFakeCompletionTask+0x1b1 atmarpc!RmResumeTask+0x129 atmarpc!rmWorkItemHandler_ResumeTaskAsync+0 NDIS!ndisWorkItemHandler+0xa ntkrnlmp!ExpWorkerThread+0xcb ntkrnlmp!PspSystemThreadStartup+0x54 ntkrnlmp!KiThreadStartup+0x16
03/26/1999 JosephJ Some proposed modifications to RM task handling ... - RmUnloadAllObjectsInGroup causes the cascaded chain of start tasks above if the unload task of each object returns synchronously or asynchronously but with the original start task still on the stack. This has to change. A One fix is for RmUnloadAllObjectsInGroup to call an unload *function* (instead of starting a task) for each object. This unload function would take the unload-all-objects task as an argument and if necessary start a task and make the coordinating task pend on it. If this function returns synchronously, however, then the unload-all-objects task can go on to the next task. B Another fix is to make RmPendTaskOnOtherTask return PENDING if the task has been pended or SUCCESS if OtherTask has already completed. Currently, typical sequence of starting and pending on another task is: pOtherTask = AllocTask(...); RmPendOnOtherTask(pTask, pOtherTask,...); RmStartTask(pOtherTask,...); With the proposed change, the sequence becomes... pOtherTask = AllocTask(...); RmTmpReferenceObject(&pOtherTask.Hdr,...); RmStartTask(pOtherTask,...); Status = RmPendTaskOnOtherTask(pTask, pOtherTask, ...); RmTmpDereferenceObject(&pOtherTask.Hdr,...); if (PEND(Status)) { // we're pending on the other task. ... } else { // Other task is complete. Go on to the next step. // } For now, we can use an StartAndTryPend internal api used only by the unload-all-objects task so we don't have to go and change things everywhere.
Implemented option 'B', but specifically for use by rmTaskUnloadGroup. The new version of the pend function is called RmPendTaskOnOtherTaskV2 (called only by rmTaskUnloadGroup).
03/26/1999 JosephJ Was a bug in my code to switch to async before calling DelIF... Following is an example of using dumps of object associations and logs to quickly find out what's going on and where the problem is....
The net stop was hanging, but the system was otherwise available. So I broke in and this is what I found...
kd> !rm asc 0xFE666168 Associations (50 max) for 0xFE666168 (INTERFACE): IP IF Open Child of 0xFF8F2A68 (Adapter) Owns group 0xFE666234 (LocalIp group) Owns group 0xFE666278 (RemoteIp group) Owns group 0xFE6662BC (Destination group) Buffer pool 0xFE666330 Parent of 0xFF8D8708 (Task: Shutdown Interface) kd> !rm asc 0xFF8D8708 Associations (50 max) for 0xFF8D8708 (Task: Shutdown Interface): Blocks 0xFF8F0848 (Task:Unload Object) Child of 0xFE666168 (INTERFACE) Resume async (param=0x00000000)
kd> !rm log 0xFE666168 Log entries for 0xFE666168 (INTERFACE) (41 of 41): Del assoc: Parent of 0xFE6782E8 (Destination) Del assoc: Parent of 0xFF90FBA8 (Task:UnloadAllObjectsInGroup) Del assoc: Parent of 0xFF8EDD08 (Destination) Del assoc: Parent of 0xFF91A4C8 (Destination) Del assoc: Parent of 0xFF8EE6E8 (Destination) Del assoc: Parent of 0xFF8D4268 (Task:UnloadAllObjectsInGroup) Del assoc: Parent of 0xFF90F428 (Task:UnloadAllObjectsInGroup) Add assoc: Parent of 0xFF90FBA8 (Task:UnloadAllObjectsInGroup) Del assoc: Parent of 0xFF907448 (RemoteIp) .... Add assoc: Parent of 0xFF8F0848 (Task: Initialize Interface) Add assoc: Child of 0xFF8F2A68 (Adapter)
kd> !rm log 0xFF8D8708 Log entries for 0xFF8D8708 (Task: Shutdown Interface) (50 of 2486): Del assoc: Resume async (param=0x00000000) Add assoc: Resume async (param=0x00000000) Del assoc: Resume async (param=0x00000000) Add assoc: Resume async (param=0x00000000) Del assoc: Resume async (param=0x00000000) Add assoc: Resume async (param=0x00000000) Del assoc: Resume async (param=0x00000000) ...
Note the 2486 log entries above! So basically what's happening is that the IF shutdown task was in an endless loop of switching to async -- this was because it was checking whether it was at PASSIVE wit the IF lock held!
03/27/1999 JosephJ ARP Packet handling
// Parsed version of the ARP request/response pkt // typedef struct { enum { ArpRequest = 1, ArpResponse = 2 } OpCode;
USHORT SenderMaxRec; USHORT SenderSspd;
NIC1394_FIFO_ADDRESS SenderHwAddr;
IP_ADDRESS SenderIpAddress; IP_ADDRESS TargetIpAddress; } IPV4_1394_ARP_PKT_INFO;
NDIS_STATUS arpParseArpPkt( IN PVOID pvPktData, IN UINT cbPktData, IN OUT IPV4_1394_ARP_PKT_INFO *pArpPktInfo );
NDIS_STATUS arpPrepareArpPkt( IN IPV4_1394_ARP_PKT_INFO *pArpPktInfo IN PVOID pvPktData, IN UINT cbMaxPktData, out PUINT pcbMaxPktData );
03/27/1999 JosephJ ARP Packet handling (contd..) Defined the following over-the wire packet formats: NIC1394_GASP_HEADER (nic1394.h) NIC1394_FIRST_FRAGMENT_HEADER (nic1394.h) NIC1394_FRAGMENT_HEADER (nic1394.h) IP1394_ARP_PKT (rfc.h)
03/28/1999 JosephJ Created subdirs w2k and win98 to build for w2k and win98. Moved & modified makefile and sources down to w2k and also win98.
03/28/1999 JosephJ ARP packet handling (contd...) Implemented arpParseArpPkt and arpPrepareArpPkt (in arp.c)
03/28/1999 JosephJ Thoughts on cleaning up RmLookupObjectInGroup RmLookupObjectInGroup is too overloaded -- split it up into a LookupOrCreate function and a pure Lookup function. Or maybe use macros...
03/29/1999 JosephJ max_rec and sspd info in ARP pkts... We should request that sspd info be removed from the ARP pkt. Anyway, I've sent mail to georgioc asking how to get this information for the local host.
03/30/1999 JosephJ Yet another way to handle failures in the task handler.... From arpTaskInitializeInterface(...): // Couldn't allocate task. Let's do a fake completion of // this stage... // UNLOCKOBJ(pIF, pSR); RmSuspendTask(pTask, PEND_SetupReceiveVc, pSR); RmResumeTask(pTask, (UINT_PTR) Status, pSR);
03/30/1999 JosephJ Thougts on using tasks to help write pageable code
Support for "pageable" tasks -- the rm api's can make sure that the context is passive (switching to passive if required) whenever the handler is called. We can require only the START and (optional) complete handlers to be nonpaged. Even the START handler doesn't need to be pageable -- if we require that RmStartTask be called at PASSIVE.
I think this is a pretty cool concept and should be explored further.
03/30/1999 JosephJ Interesting stack traces for load/unload of atmarpc...
ntkrnlmp!IofCallDriver nic1394!nicSubmitIrp+0x197 nic1394!nicSubmitIrp_Synch+0x173 nic1394!nicAllocateAddressRange+0x446 nic1394!nicCmMakeCallInitVc+0x6b7 nic1394!NicCmMakeCall+0x29b NDIS!NdisClMakeCall+0x86 atmarpc!arpTaskMakeRecvFifoCall+0x3ae atmarpc!RmStartTask+0x12f atmarpc!arpTaskInitializeInterface+0x318 atmarpc!RmResumeTask+0x129 atmarpc!ArpCoOpenAfComplete+0x104 NDIS!NdisCmOpenAddressFamilyComplete+0xce NDIS!NdisClOpenAddressFamily+0x1e4 atmarpc!arpTaskInitializeInterface+0x17a atmarpc!RmStartTask+0x12f atmarpc!ArpCoAfRegisterNotify+0x246 NDIS!ndisNotifyAfRegistration+0x62 NDIS!ndisMFinishQueuedPendingOpen+0xfd NDIS!ndisWorkerThread+0x5c
nic1394!nicFreeAddressRange nic1394!NicCmCloseCall+0xf0 NDIS!NdisClCloseCall+0x64 atmarpc!arpTaskCleanupRecvFifoCall+0x36a atmarpc!RmStartTask+0x12f atmarpc!arpTaskShutdownInterface+0x245 atmarpc!RmStartTask+0x12f atmarpc!arpTaskShutdownAdapter+0x35c atmarpc!RmStartTask+0x12f atmarpc!rmTaskUnloadGroup+0x44c atmarpc!RmStartTask+0x12f atmarpc!RmUnloadAllObjectsInGroup+0x10e atmarpc!arpResHandleGlobalIpBinding+0x1e0 atmarpc!RmUnloadAllGenericResources+0x101 atmarpc!ArpUnload+0x5d ntkrnlmp!IopLoadUnloadDriver+0x14 ntkrnlmp!ExpWorkerThread+0xcb ntkrnlmp!ObpCreateHandle+0x165
03/31/1999 JosephJ Static ping works! Today, we got ping and ttcp to work across two machines, over ip/1394! Throughput was dismal -- ~ 250K bytes/sec (2M bits/sec), but otherwise it's stable (pinged all night, continues to ping...), provided you don't try to yank the cable etc in the middle. ADube is working on nic1394 to fix the latter problems.
Great thing is that ABSOLUTELY NO FIXES were required in atmarpc.sys to get this to work (I just compiled atmarpc.sys with the option to use the real make/close call and send pkt apis.).
04/02/1999 JosephJ RM logging contd... Add another SLIST_ENTRY for threading together all log entries generated during a particular stack trace. The stack record would contain the list head.
Consider putting refcounts on each log entry.
04/07/1999 JosephJ fake api's caught case where we could be calling add if at DPC The fake recv makecall completed at DPC level,and this caused a bugcheck when we called IP's add IF routine. Fixed this by switching to passive if required, before calling IP's add IF routine.
04/07/1999 JosephJ verified that this is 64-bit clean (checked and fre)
04/07/1999 JosephJ Added arp1394 and arp13kd sources to the tcpipmerge project. Did this today.
04/08/1999 JosephJ added tmp ref in RmResumeTask RmResumeTask now tmpref task before calling pfnHandler so that it can be sure pTask is around on return from pfnHandler. Actually hit this situation today (and bugchecked) on the mp machine during "net stop", when using the fake ndis apis (with delayed completions.). Had never this this before, though the bug has been around. Chalk up another win to the fake apis (see 04/07/199 entry "fake api's caught...").
04/08/1999 JosephJ Debug output of the fake ndis apis (during ttcp -t) Following is debug spew during ttcp -t, on a 2-proc machine with fake NdisCoSendPackets in place (you can see both processors being used, as well as the variations of delay, dpc/passive, failure status). ... 1:A13: FakeCompletionTask:START: Delay=1000; fDpc=0; Status=0 0:A13: FakeCompletionTask:START: Delay=10000; fDpc=0; Status=3221225473 0:A13: FakeCompletionTask:START: Delay=10; fDpc=0; Status=0 0:A13: FakeCompletionTask:START: Delay=10; fDpc=1; Status=0 1:A13: FakeCompletionTask:START: Delay=100; fDpc=0; Status=3221225473 0:A13: FakeCompletionTask:START: Delay=100; fDpc=1; Status=3221225473 1:A13: FakeCompletionTask:START: Delay=100; fDpc=1; Status=3221225473 1:A13: FakeCompletionTask:START: Delay=100; fDpc=1; Status=3221225473 1:A13: FakeCompletionTask:START: Delay=10; fDpc=0; Status=0 1:A13: FakeCompletionTask:START: Delay=10; fDpc=1; Status=0 ...
04/10/1999 JosephJ defined ioctl commands Defined the following operations and associated structures in ioctl.h ARP1394_IOCTL_OP_ADD_STATIC_ENTRY ARP1394_IOCTL_OP_DEL_STATIC_ENTRY ARP1394_IOCTL_OP_GET_PACKET_STATS ARP1394_IOCTL_OP_GET_TASK_STATS ARP1394_IOCTL_OP_GET_ARPTABLE_STATS ARP1394_IOCTL_OP_GET_CALL_STATS
04/19/1999 JosephJ Various ways of using tasks 1. Dealing with pre-existing tasks 1a. Check BEFORE starting new task... if not bound allocate and initialize task, then bind it. else do one of... - succeed operation immediately - fail operation immediately - pend some other task on it - block until existing task completes. PROBLEM: what to do if some other task is bound and only one task can be bound at a time? 1b. Check AFTER starting new task... if not bound bind do other ttuff else do one of... - complete task successfully - fail task - pend on the other task 2. Dealing with async sub tasks... 2a. single section of common code; pending complete parts may do some initial processing and then go to the common code section. 2b. no common code -- each section does stuff and initiates a real or fake suspention to move on to the next section. 2c. switch with fall through to lower section.
04/19/1999 JosephJ Cleaning up interface shutdown.... ToDo: 2. Switch to approach 2c above.
04/19/1999 JosephJ Proposed new general format for unloadobject:
Eventually we'll move all unloads to conform to this format, and change RmUnloadAllObjects in group to use this mechanism....
NDIS_STATUS arpUnloadIf( PARP1394_INTERFACE pIF, PRM_TASK pCallingTask, // OPTIONAL UINT SuspendCode, // OPTIONAL PRM_STACK_RECORD pSR ) /*++ Routine Description:
Initiate the asynchronous unload of pIF. If pIF is currently being loaded (initialized), abort the initializeation or wait for it to complete before unloading it. If pIF is currently being unloaded and pCallingTask is NULL, return right away, else (pCallingTask is not NULL), suspend pCallingTask and make it pend until the unload completes. NO locks must be held on entrance and none are held on exit.
Arguments:
pIF - Interface to unload. pCallingTask - Optional task to suspend if unload is completing async. SuspendCode - SuspendCode for the above task.
Return Value:
NDIS_STATUS_SUCCESS -- on synchronous success OR pCallingTask==NULL NDIS_STATUS_PENDING -- if pCallingTask is made to pend until the operation completes.
--*/ { ... } 04/20/1999 JosephJ Do we have a "pPrimaryTask" for an object. Consider ARP1394_INTERFACE. We could have 3 pointers: pLoadTask,pUnloadTask, and pReinitTask, or we could have a single pointer: pPrimaryTask. New\Current Loading Reiniting Unloading Loading INVALID INVALID INVALID Reiniting wait wait,then quit quit or wait, then quit Unloading wait wait wait
From the above matrix, we see that in all cases if an incoming task sees that there is an existing task, it can basically wait for it to complete before going on to the next stage. It is simpler to do this if there is only one "existing task" to wait for -- the pPrimaryTask.
Common code for the task handlers:
case START: // FALL THROUGH
case PEND_ExistingPrimaryTaskComplete: LOCKOBJ(pIF, pSR); if (pIF->pPrimaryTask!=NULL) { PRM_TASK pPrimaryTask = pIF->pPrimaryTask; tmpRef(pIF->pPrimaryTask,pSR); UNLOCKOBJ(pIF,pSR); RmPendTaskOnOtherTask( pTask, PEND_ExistingPrimaryTaskComplete, pPrimaryTask, pSR ); Status = NDIS_STATUS_PENDING; break; }
// // There is no primary task currently -- make pTask the primary task. // arpSetPrimaryIfTask(pIF, pTask, pSR);
.... start doing stuff ...
04/20/1999 JosephJ Dbg associations: consider adding a payload Maybe replace entity 2 by "payload" -- like szFormat, it's not used in distinguishing different associations. This is useful if you want to make sure that there is only one kind of a particular association, but still save the payload as part of the association.
04/20/1999 JosephJ Note on RM "philosophy" - High-level logical concepts should have real data structures associated with them -- eg "reconfiguring", "initializing" use tasks.
- Try to keep code associated with a single logical operation together
04/21/1999 JosephJ Life of objects contd...
States: INITING INITED REINITING DEINITING DEINITED
Actions: Create -- synchronous, leaves state in INITING stage. Bind -- object is now visible Initialize -- async initialization Reinit -- async re-initialization Deinit -- async de-initialization deleted. Delete -- inverse of Create, except that object is only actually freed when the refcount goes to zero..
Sub states: ACTIVE,DEACTIVATING,ACTIVATING, DEACTIVATED Sub actions: Activate -- async activation Deactivate -- async deactivation
04/23/1999 JosephJ arpTaskUnloadRemoteIp <-> arpTaskSendPktsOnRemoteIp interaction arpTaskUnloadRemoteIp checks only on starting if there is a send-task bound to pRemoteIp -- it relies on the fact that once the unload task is bound, no NEW pSendTask will bind to pRemoteIp. The sendpkts task thus needs to check whether there is a pUnloadTask bound and if so not bind itself. This fix was added today -- I hit it during stress. There may be analogous bugs hiding elsewhere.
We should consider how to make these things "automatic" -- somehow the unload task waits for all tasks started before unload to finish, and all non-unload-related tasks automatically fail if unload is in progress.
04/25/1999 JosephJ More Task Stats -- count of number of times a task's handler is called
04/30/1999 JosephJ Bug in the way we read adapter config. Basically, immediately after our call to NdisOpenAdapter completes, we may get a call to our ArpCoAfRegisterNotify. The latter can't assume that the task that issued NdisOpenAdapter is in fact completed, and on MP machines, in fact it sometimes doesn't complete.
So what to do? Currently we fix this by pending on the adapter bind task if it is in fact arpTaskInitializeAdapter. A bit hacky...
04/30/1999 JosephJ Bug in the way we handle RmResumeTask and perhaps others.. We can't rely on the state of the task after calling the handler function, because the lock is released in between.
05/18/1999 JosephJ Stats gathering.
Potential apis to use:
NdisGetCurrentSystemTime returns the current system time, suitable for setting timestamps.
KeQueryPerformanceCounter provides the finest grained running count available in the system. KeQueryPerformanceCounter is intended for time stamping packets or for computing performance and capacity measurements. It is not intended for measuring elapsed time, for computing stalls or waits, or for iterations. Use this routine sparingly, calling it as infrequently as possible. Depending on the platform, KeQueryPerformanceCounter can disable system-wide interrupts for a minimal interval. Consequently, calling this routine frequently or repeatedly, as in an iteration, defeats its purpose of returning very fine-grained, running time-stamp information. Calling this routine too frequently can degrade I/O performance for the calling driver and for the system as a whole. Implementation:
pIf->stats.StatsResetTime; // Set by a call to NdisGetCurrentSystemTime. Sends: Pkt.WrapperReservedEx[sizeof(PVOID)] -- used for storing 4-byte timestamp.
Tasks: Add LONGLONG timestamp field for tasks; Stats actually maintained within rm. (Later to be moved into root object header).
sendpkts: TotSends; -- LOGSTATS_TotSends FastSends; LOGSTATS_FastSends MediumSends; LOGSTATS_MediumSends SlowSends; LOGSTATS_SlowSends BackFills; LOGSTATS_BackFills SendFifoCounts -- arpLogSendFifoCounts SendChannelCounts -- TBD.
// HeaderBufUses -- see below // HeaderBufCacheHits -- see below
sendinfo.FifoHeaderPool.stats: TotBufAllocs -- LOGBUFSTATS_TotBufAllocs TotCacheAllocs -- LOGBUFSTATS_TotCacheAllocs TotAllocFails -- LOGBUFSTATS_TotAllocFails
recvpkts: TotRecvs -- LOGBUFSTATS_TotRecvs NoCopyRecvs -- LOGBUFSTATS_NoCopyRecvs CopyRecvs -- LOGBUFSTATS_CopyRecvs ResourceRecvs -- LOGBUFSTATS_ResourceRecvs RecvFifoCounts -- LOGBUFSTATS_RecvFifoCounts RecvChannelCounts -- TBD.
arpcache: TotalQueries -- TBD SuccessfulQueries -- TBD FailedQueries -- TBD TotalResponses -- TBD TotalLookups -- LOGSTATS_TotalArpCacheLookups(pIF, Status); // TraverseRatio <-- picked up from pIF->RemoteIpGroup.HashTable.Stats (LOWORD(Stats)/HIWORD(Stats))
calls: TotalSendFifoMakeCalls -- LOGSTATS_TotalSendFifoMakeCalls SuccessfulSendFifoMakeCalls -- LOGSTATS_SuccessfulSendFifoMakeCalls FailedSendFifoMakeCalls -- LOGSTATS_FailedSendFifoMakeCalls IncomingClosesOnSendFifos -- LOGSTATS_IncomingClosesOnSendFifos
TotalChannelMakeCalls -- LOGSTATS_TotalChannelMakeCalls FailedChannelMakeCalls -- (TBD) LOGSTATS_SuccessfulChannelMakeCalls SuccessfulChannelMakeCalls -- (TBD) LOGSTATS_FailedChannelMakeCalls IncomingClosesOnChannels -- (TBD) LOGSTATS_IncomingClosesOnChannels
tasks: TotalTasks -- TBD CurrentTasks -- TBD TimeCounts -- TBD
06/03/1999 Broadcast channel support in ARP1394.
Arp1394 needs to make a call specifying special-channel number "NIC1394_BROADCAST_CHANNEL". It must not specify the NIC1394_VCFLAG_ALLOCATE flag.
The broadcast channel is a virtual channel maintained by the miniport for broadcast. The miniport deals with the details of the BCM and the re-allocating of the channel after a bus reset.
Arp1394 tries just once, during interface activation, to make a call to the broadcast channel. It does not fail initialization if the call fails. If we get an incoming close on this channel, arp1394 does not try to re-make the call.
TODO: need to add eventlog entries for serious errors like these. TODO: perhaps keep an internal log of serious errors like these, which our utility can dump (eventually move to WMI).
The make-call to the channel is made by the interface-activation task (arpTaskActivateInterface) and closed by the interface-deactivation task (arpTaskDeactivateInterface).
06/03/1999 Address resolution protocol implementation We start an address-resolution (AR) task for each remote-ip that needs address resolution. pRemoteIp->pResolutionTask points to the official AR task.
The AR's task is responsible for creating and linking a pDest to the remote IP. Note that there may be many tasks (each associated with different remote-ip objects) running concurrently, each of which resolve to the same pDest.
The AR task goes through the following steps:
- prepare and send an arp request -- resume-task delayed [if we get a response that corresponds to this remote-IP, we setup the linkage to the pDest and cancel the delayed resume-task] -- if resume-task-delayed resumes normally (this is a timeout), we repeat the process 3 times, then fail.
06/08/1999 Broadcast channel implementation plan. 1. Implement and test bc channel setup/teardown using fake makecalls. 2. Implement and test 1st phase of arp resolution (sending out 3 requests) by using fake send packets on the broadcast channel. 3. Implement the remaining phases of arp resolution -- processing received responses and requests. 4. Perhaps test this by adding to ioctl utility ability to simulate received packets.
06/23/1999 Dealing with different kinds of VCs.
We need a common VC header.
typedef struct { PCHAR Description; CO_SEND_COMPLETE_HANDLER CoSendCompleteHandler; CO_STATUS_HANDLER CoStatusHandler; CO_RECEIVE_PACKET_HANDLER CoReceivePacketHandler; CO_AF_REGISTER_NOTIFY_HANDLER CoAfRegisterNotifyHandler;
CL_MAKE_CALL_COMPLETE_HANDLER ClMakeCallCompleteHandler; CL_CLOSE_CALL_COMPLETE_HANDLER ClCloseCallCompleteHandler; CL_INCOMING_CLOSE_CALL_HANDLER ClIncomingCloseCallHandler; } ARP_STATIC_VC_INFO;
typedef struct { ARP_STATIC_VC_INFO pStaticInfo; UINT
} ARP_VC_HEADER;
06/24/1999 Implementing timeouts We have RmResumeTaskDelayed, which uses NdisSetTimer; We need something like RmResumeDelayedTaskNow which cancels the timer and if the timer has not fired, resumes the task with an appropriate status.
Since responses to arp requests may come at random times or not at all, the task should not have a stage which completes when the response is received; or rather it should not be explicitly completing whenever a response is received. Instead, if a response is received, the following should happen: - Update the information in the destination object, setting the state to be resolved. - If a task is running, abort it The task does the following (asynchronously) while (state != resolved && (number of tries not exceeded)) { send arp request packet; wait retry-delay << this wait will be aborted if an arp response << is received. }
This deals with receiveing delayed or unsolicited arp responses while in the middle of address resolution.
06/24/1999 A note on refcounts for timeouts: We need to make sure that in all cases, the task is around when the timer fires. This needs to happen even when RmResumeDelayedTaskNow is called.
RmResumeDelayedTask should do the following: if (CancelTimer succeeds) { Call resume task handler } else { do nothing. }
So I don't think any explicit ref counting need be done for the tasks after all! 06/24/1999 Dealing with broadcast/multicast addresses which may map to either the broadcast channel or a mcap-allocated channel.
One idea is to implement the broadcast channel as a destination object. This is a good idea, because then a lot of things will fall through. We do need to actually establish the call, but this can be done implicitly when we send our unsolicited arp response when the first add-ip arrives. 06/28/1999
To implement the above scheme, we also need to do the arp-registration work, and rip out the code we're written to maintain the explicit broadcast channel (stuff in pIF->bccinfo).
ArpCoSendComplete -- needs to look at vctype and/or packets to decide what to do for the broadcast channel case.
07/01/1999 JosephJ Broadcast/Multicast "address resolution" To maximize shared code, we treat broadcast and multicast sends similarly to unicast sends, except that we automatically resolve them to the broadcast channel in stead of sending out an ARP request for them.
So the first time we are asked to send to non-unicast address A, we go down the slow send path, create a remote-IP object for it, link it to the broadcast channel destination destination object, and go from there.
We DO need to know if this is a non-unicast address, but we only check this if there is NO linkage to a destination object -- which will happen only on the FIRST packet sent to that particular ip address. Subsequent packets will go through the medium send path (look up remoteIP, send on the VC associated with the destination object).
The test for whether an address is non-unicast is not trivial, and is borrowed from the atmarpc code -- basically it needs to check for classD, all-1's, subnet-broadcast (based on the subnet-masks of all the local IP adresses registered), and network broadcast (based on the break up of address space into classes.)
Following is an example of the list of local IP addresses registered 0: kd> dd 0x80872628+0x4c l3 80872674 00000002 ffffffff 00000000 <<< all 1's 0: kd> dd 0x80856828+0x4c l3 80856874 00000000 bbfdfea9 0000ffff <<< local IP, subnet mask 0xffff 0: kd> dd 0x80857128+0x4c l3 80857174 00000001 010000e0 00000000 <<< class D address 224.0.0.1
NOTE: According to Amritansh, the stack could also be run in "BSD mode", where all-ZEROs represents the broadcast address -- even in the host-id portion for directed broadcasts. This is why the broadcast address is passed in as a "Add local address."
07/02/1999 Support for enumerating all objects in a group. Currently this is required in 4 places: 1. ioctl.c -- looking for a specific interface 2. ioctl.c -- looking for a unicast local-ip object 3. ioctl.c -- reporting the arp table. 4. ip.c -- reporting the arp table. 5. ip.c -- determining if an ip address is non-unicast.
It would be good for the rm api's to support enumeration through all items in a group.
PVOID RmEnumerateObjectsInGroup( pGroup, pfnFunction, pvContext, pSR );
Enumeration continues until the enumerator function returns false. typedef INT (*PFN_RM_GROUP_ENUMERATOR) ( PRM_OBJECT_HEADER pHdr, PVOID pvContext, PRM_STACK_RECORD pSR );
07/07/1999 JosephJ DONE: 1. Define the common vc header structure, including the specialized co handlers, and incorporate that into the existing code. 2. Modify activate interface task to create the BCDO (broadcast channel destination object) and make a call to it. Add a link between the BCDO and the interface object. 3. Modify the deactivate task to remove the above link. 4. Add code to existing resolution task to hardcode the mapping from broadcast and multicast addreses to the BCDO. 5. Write handlers for send complete & receive to/from the BCDO channel. 10. Write ARP packet management code (pkt queues). 9. TEST with REAL make calls and send packets. - as above - verify that the bcast packets are received. 13. Implement CancelResumeTaskDelayed. 11. Write arp address resolution task -- originating side. 12. Write arp request handling code. 14. Write SendArpPktOnBCDO function. TODO: ------- 6. Code review the major paths ------- 7. TEST with FAKE make calls & FAKE send packets. - verify that bc channel is created and bcast packets are sent on the BC channel. - verify that the BC channel is cleaned up on net stop arp1394. 8. TEST with REAL make calls and FAKE send packets. - as above. ------- ------- 15. Code review the major paths. ------- 16. TEST with FAKE make calls & FAKE send packets. - verify that bc channel is created and bcast packets are sent on the BC channel. - verify that the BC channel is cleaned up on net stop arp1394. - verify that arp requests are being composed and sent. 17. TEST with REAL make calls and FAKE send packets. - as above. 18. TEST with REAL make calls and send packets. - plus verify that the bcast and arp-request packets are received. - verify that arp responses are being generated and received. - get ping to work without pre-populating the arp table. 07/09/1999 ResumeDelayedTaskNow semantics and problems. Is it possible for someone to call ResumeDelayedTaskNow and have it resume
07/13/1999 Lookaside lists for protocol data. We could use lookaside lists (NdisAllocateFromNPagedLookasideList) for protocol packet data, but we choose to use NdisAllocateMemoryWithTag, because we don't expect to be using a lot of these packets.
07/13/1999 General thoughts on fault insertion. Either the implementation of APIs themselves should have a mechanism for fault insertion, or there should be a machanism to add a shim that inserts faults. Either way, it would catch many many bugs that would otherwise go undetected.
07/13/1999 protocol context for ARP pkts: We use the PCCommon structure defined in ip.h even for ARP packets. This is also done in the ATM arp module (atmarpc.sys). sizeof(struct PCCommon)
The only field we actually USE however, is PCCommon.pc_owner, to distinguish it from IP pkts on send completion.
07/14/1999 Making sure we properly abort the resolution task. pResolutionTask needs to have to variables: fAbort fTimerInitialized
if (fTimerInitialized, it's ok to called cancel timer) if (fAbort, then the task won't do a resume).
Never mind. This is best handled WITHIN the RM API's, by appropriate use of internal. The semantics of ResumeDelayedTaskNow are as follows: It will cause the abort of the task if it's currently delay-suspended OR. If it is NOT suspended, it will cause an immediate abort the NEXT time it is suspended. After the abort, the state is cleared so it will not cause the abort of a subsequent suspension. States/Flags - DELAYED - ABORT_DELAY
ResumeDelayedTaskNow: lock if (delayed) { clear abort-delay clear delayed if (CancelTimer) { unlock call completion ourselves. } else { unlock } } else { State |= abort-delay unlock }
ResumeDelayedTaskNow (VERSION 2) lock if (delayed) { if (CancelTimer) { unlock call timeout handler ourselves. } else { unlock } } else { State |= abort-delay unlock }
ResumeTaskDelayed: lock assert(state!=delayed) if (abort-delay) { clear abort-delay unlock call completion ourselves. } else { init-timer State |= delayed unlock set-timer lock if (abort-delay && delayed) { clear abort-delay clear delayed if (CancelTimer) { unlock call completion ourselves } else { unlock } } else { unlock } }
ResumeTaskDelayed: (VERSION 2) lock assert(state!=delayed) init-timer State |= delayed
if (abort-delay) { unlock call timer handler ourselves. } else { set-timer << important to do this BEFORE unlocking! unlock }
TimerHandler: lock assert(delayed) clear abort-delay clear delayed unlock Actually resume task.
// Task delay state // RM_SET_STATE(pObj, RMTSKDELSTATE_MASK, RMTSKDELSTATE_DELAYED)
// Task abort state // RM_SET_STATE(pObj, RMTSKABORTSTATE_MASK, RMTSKABORTSTATE_ABORT_DELAY)
bp arp1394!DbgMark "dd esp+4 l1"
007a05852c48c6262f3b96f330b6f7e23be1b9026f31a739c627713cdaab68c3e4950c47e9f37ba9f87d7fff
arpCompleteSentPkt -- needs to deal with arp-generated pkts.
07/15/1999 Building for win98nd.c(140) : error C1189: #error : "Unco.c(1796) : error C1189: #error : "Check if ARP1394_IP_PHYSADDR_LEN value is ok..."
bp arp1394!arpProcessReceivedPacketbp arp1394!arpProcessArpPktbp arp1394!arpProcessReceivedPacket+294 "r ecx"bp arp1394!arpParseArpPktbp arp1394!arpProcessArpRequestbp arp1394!arpProcessArpResponse
07/16/1999 Win98 Build plan.Handle the unicode/ansi transition.Test.Stuff which needs to change:
co.c arpCallAddInterface
(atm: adapter.c AtmArpBindAdapterHandler saves away unicode version of config string (SystemSpecific1) in pAdapter->ConfigString. (arpcfg.c) AtmArpCfgReadAdapterConfiguration -- uses pAdapter->ConfigString to open and read the adapter's configuration; AtmArpCfgReadAdapterConfiguration is called in only one place -- AtmArpCoAfRegisterNotifyHandler.
utils.c AtmArpAddInterfaceToAdapter W2K: pInterface->IPConfigString = *pIPConfigString W98: converted to ANSI first, but NOT saved in pInterface->IPConfigString.
Further down, specifies the converted string in the call to IP's pIPAddInterfaceRtn.
Need to see what we dow with pInterface->IPConfigString in W2K. arpif.c AtmArpReStartInterface -- uses it to call AtmArpCfgOpenLISConfigurationByName and AtmArpAddInterfaceToAdapter
Another IPConfigString: pAdapter->IPConfigString -- used to find interface (in AtmArpPnPReconfigHandler, a config-string is passed in). Gets it's value from the registry (arpcfg.c, AtmArpCfgReadAdapterConfiguration). This is not W98 specific.
AtmArpCfgOpenLISConfiguration uses it to get the configuration name before opening the registry.
In summary there are THREE strings: pAdapter->ConfigString <- passed in adapter bind handler SS1 (W98 only: converted from ANSI to unicode). <- used in reg af-handler to read registry. (pAdapter->bind.ConfigName)
pAdapter->IPConfigString <- read from registry as unicode <- used to create an IF (or multiple for ipatmc). (pAdapter->bind.IpConfigString)
pInterface->IPConfigString <- constructed from pAdapter->IPConfigString. (W98: converted to ANSI before calling IP's add-IF rtn.) (pIF->ip.ConfigString)
07/22/1999 JosephJ Ryan Schoff got atmarpc.sys (aka arp1394.sys) loaded under win98. We hit a breakpoint in NDIS.SYS complaining about the NULL SendCompleteHandler. I had set some handlers to NULL because they would never be used, and W2K NDIS is happy with that but NDIS is not.
07/26/1999 JosephJ A-DavHar hit a bug in arp1394 during stress where we had launched the recv-fifo cleanup task while a make-call task was ongoing. Fixed the recv-fifo task to wait for the makecall task to complete before doing its thing. TODO: Need to do this for the other kinds of VCs as well ( broadcast and send-fifo VCs).
08/03/1999 JosephJ We hit the following assert: A13: rmVerifyObjectState:FATAL: Object 0xFF8D4828 modified without lock held! A13: rmVerifyObjectState:To skip this assert, type "ed 0xFF8D1B74 1; g" A13: !ASSERT( !"Object was modified without lock held!" ) C:0xFF8D4828 L:4830, rm.c
This is because pRemoteIp's state was modified without RmLockObject(pRemoteIp) being called on it (it's safe because we had pIF's lock at that time, and pRemoteIp shares the lock with pIF). The bug is that we're not calling RmDbgChangeLockScope before/after change pRemoteIp's state.
Hit this again -- this time -- same cause. Temporarily disabled assert. TODO: need to cleanup the code by adding changelockscope.
08/19/1999 JosephJ Added code in n134cfg.c to initialize and dump the config rom unit directory for 1394 net devices. Used code from wdk\1394\bus\buspnp.c
08/23/1999 JosephJ Got arp1394.sys to load in Windows Millennium, build 23459... This is with modified mstcp.dll and nettrans.inf that recognize the new nic upper binding "ndis1394". But arp1394.sys is s failing initialization because arpCfgReadAdapterConfiguration is failing, which we would expect to ALWAYS fail (even on w2k) because it's looking for subkey ATMARPC, which doesn't exist. Perhaps it's because arpCfgReadAdapterConfiguration calls NdisOpenConfigurationKeyByName which on w2k returns success (but sets *pInterfaceConfigHandle to NULL) if the key doesn't exist. It so happens that arpGetInterfaceConfiguration, which calls arpCfgReadAdapterConfiguration, *can* deal with this somewhat indirect failure mechanism without returning failure, but if arpCfgReadAdapterConfiguration *were* to return failure, it returns failure.
I'm going to change arpGetInterfaceConfiguration so that it ignores arpCfgReadAdapterConfiguration returning failure.
08/24/1999 JosephJ Arp1394.sys now loads and works (ping works) on Millennium.
09/16/1999 JosephJ Alternative to RmDbgChangeLockScope See "08/03/1999 JosephJ We hit the following assert:" entry. Instead of RmDbgChangeLockScope, we should add "RmDbgFakeLockObject" and "RmDbgFakeUnlockObject" -- these functions just run the verification code but do not actually lock/unlock the object. They *do* verify that the object is indeed locked.
09/17/1999 JosephJ Win98/Millennium Netconfig: IPConfig value under ndi\interface. This is Win98/Millennium specific. pIF->ip.ConfigString is an ANSI value. It is created by reading the "IPConfig" value under the interface's key. With proposed changes to elminiate having to change mstcp.dll, "IPConfig" will no longer be created. It so happens that the value of IPConfig is the same as the interface key (which is passed into System).
09/17/1999 JosephJ [Version 2] Support for retail debugging or RM objects [ See 03/22/1999 note with the same title]
For now, we're going to add 4 ptrs to EVERY object. We can back off from this strategy later. This is PURELY for retail-mode debugging purposes. - Support the following RM dbgextension: !rm scantree <obj addr> <pattern> -- scans the obj at addr <obj addr> and all its children for pattern <pattern> !rm tree <obj addr> -- lists the entire tree of objects, starting at oject <obj addr>Mon 09/27/1999 JosephJ !tree implemented
Real output:
Object Tree for 0xFD015340(ArpGlobals) with parent 0x00000000(<root>): FD015340(ArpGlobals) |---FE404608(Adapter) |---|---FE3F99C8(INTERFACE) |---|---|---FE33AF68(RemoteIp) |---|---|---FE3C9948(LocalIp) |---|---|---FE3CD648(LocalIp) |---|---|---FE3CD7E8(LocalIp) |---|---|---FE3F70C8(Destination)
Tue 09/28/1999 JosephJ Millennium llipif.h We keep a win9x copy of llipif.h checked under w98\llipif.h. I did a windiff against the llipif.h in \\muroc\slm (\\muroc\slmro2\proj\net\vxd\src\tcpip\h\llipif.h) I found that the muroc version had one field extra in the LLIPBindInfo struct: ---------- TDI\TCPIPMERGE\1394\ARP1394\W98\llipif.h next ---------- 294a295 > uint lip_pnpcap; //initial pnp capability flags. This is a set of flags used to determine Wakeuponlan capability. Wed 09/29/1999 JosephJ Millennium tdiinfo.h MAX_TDI_ENTITIES 32(mill) 4096(w2k) INVALID_ENTITY_INSTANCE -1 (w2k) (not defined in mill). We don't use it either.
ArpIpGetEList appears to be the same as the Win9x version.
Fixed the problem Basically the bug is that we were not checking entity value and type for Win98 -- I copied that behavior from atmarpc, but it was in fact not compiled in in atmarpc, because DBG_QRY WAS defined for win98 (see arpif.c AtmArpIfQueryInfo).
BUGBG: need to look at the return value of AtmArpCopyToNdisBuffer -- the code the checks this was added RECENTLY to atmarpc.sys -- after I created the sources for arp1394. Apparantly we could hit this in low mem situations.
Mon 10/18/1999 JosephJ Bringing down the IF when the media is "disconnected" From: Amritansh Raghav (Exchange) yes (line down comes to me at dpc, so i delete off a worker thread) -----Original Message----- From: Joseph Joy (Exchange) So you trigger add/del based on NDIS_STATUS_WAN_LINE_UP/DOWN? -----Original Message----- From: Amritansh Raghav (Exchange) actually i do use IPAddInterface an IPDelInterface to do this remember that this can only be done at PASSIVE so NdisStatus may not be the place to do it (of course i got this to work by asking jameel to provide a hack whereby he doesnt raise the irql for the lineup status indication) -----Original Message----- From: Joseph Joy (Exchange) Hi Amritansh, I'd like to dynamically make the IP interface associated with a 1394 adapter appear and disappear based on whether there are any other ip/1394 capable devices attached. The local ndis1394 miniport itself stays enabled regardless of whether there are remote nodes or not. So I'd like to trigger the appearance/disappearance based on some status indication. I'd like ipconfig to not list the interface at all (not just list it as "disconnected") if there are no remote nodes active. Looks like you have a solution for wan devices -- the interface is only listed via ipconfig if there is an active wan connection. How is this done? Arvind tells me that wanarp doesn't call IPDelInterface. We've decided to trigger off "disconnected" status. On register notify: check if status is disconnected. If disconnected: don't init interface, else: init interface.
On connect notification: if IF is going away -- queue task to re- start based on registry config (unless adapter going away).
On disconnect notification: start delayed task to get rid of adapter.
Mon 10/18/1999 Registering local arp addresses. Ethernet arp has the following logic ARPAddAddr: for local, unicast addresses it subits an arp request returns IP_PENDING
NOTE: When sending an arp request, we need to be careful about which Src ip address we use -- using the one for the correct subnet! see ip\arp.c (SendARPRequest).
CONFLICT: If it's a response confict and we're still registering the local address, we fail the local address by calling SendARPRequest(Interface, *SPAddr, ARP_RESOLVING_GLOBAL,) IPAddAddrComplete(Address, SAC, IP_DUPLICATE_ADDRESS); (where SAC == Context2 passed to our AddAddress routine).
Wed 11/03/1999 JosephJ RM: factoring out common functionality for load/unload Rewriting adapter's arpTaskInitialize/ShutdownAdapter to be similar to the interface's in the sense that there is a primary and secondary task, and the primary task is the one responsible for (a) waiting for other primary tasks to complete and (b) running the "compensating" transaction if the the actual activate-adapter task fails. Also the task is written to minimize the adapter-specific code -- with the view towards of eventually having a generic RM-supplied task handler to do this for any object. arpTaskInitialize/ShutdownAdapter are also written to emulate the flattening of message types -- they handle start, pend-completes and end in a single case statement which supports fallthrough. TODO: consider adding pPrimaryTask and pSecondaryTask to the object header, and adding Init/Shutdown (aka load/unload) and activate/deactivate handlers to the object's static info. This will be required to move to common load/unload handling. ALSO: look at arp[Set|Clear][Primary|Secondary]IfTask in util.c -- these could be generalized.
Wed 11/03/1999 JosephJ RM: Generalizing load/unload to arbitrary tasks The general idea of (a) and (b) can be applied to other (user defined) operations on the object, not just init/shutdown. Think about how RM can provide standard "caretaker" tasks which will do (a) and (b) -- letting the user-defined tasks focus on pure functionality, not queuing and cleanup on failure -- the latter is a bit analogous to exception handling in the synchronous world.
Wed 11/03/1999 JosephJ RM: More thoughts on state validation Add the concept of a state validation function which gets called to validate state transitions -- at the point the object is unlocked. The function is given the old and new states (the rm object dword state variable).
Wed 11/03/1999 JosephJ RM: Validate parent type Allow an object's static info to specify the allowed parent type -- this is important because much code assumes that a parent is of a particular type.E:\nt\public\tools signcode -v %_NTBINDIR%\public\tools\driver.pvk -spc %_NTBINDIR%\public\tools\driver.spc -n "Microsoft Windows 2000 Test Signature" -i "http://ntbld" -t http://timestamp.verisign.com/scripts/timstamp.dll filetosign
chktrust win2k filename--Scott
Fri 11/05/1999 JosephJ Why ICS wasn't binding to nic1394.h Needed to add ndis1394 to the lower binding in setup\inf\usa\icsharep.inx
Fri 11/05/1999 JosephJ Debugging the "autonet address" problem.
The problem: We weren't getting an autonet address, and DHCP wasn't working.
From Scott Holden: set a bp on RequestDHCPAddr (This is in VIP)
If it hits this breakpoint, then we are going to DHCP. If it goes to DHCP, see if it hits VIP_Set_Addr or VIP_Set_Addr_Ex.
I set and found out that it was being called, but eventually it was failing because arp1394 was failing a QueryInfo because it was not in the IF_PS_INITED state (because the interface's init task was still running). Setting the check in QueryInfo to take EITHER PS_INITED or AS_ACTIVATING made it work.
Fri 11/05/1999 JosephJ Re-wrote adapter init/shutdown code It's now a two-level scheme similar to what the interface uses -- init/shutdown and activate/deactivate.
Thu 11/11/1999 JosephJ Deferred interface init until adapter is "connected" Modified arpTaskInitInterface (co.c) so that it will check if the adapter is connected before proceeding to make the call to the broadcast VC and (and subsequently adding the IF). It currently simply waits for 5 seconds before each attempt to check the connect state (it doesn't hook into the connect notification -- we should do that). It also needs to switch to passive before calling NdisRequest (which is actually a macro which ends up calling NdisCoRequest in the context of a work item) -- because we Block until the request completes asnc. So it's a lot of overhead just to get the connect status which would be eliminated if we hooked into the connect status notification. On the plus side: the modifications to enable this delay-until-connect functionalty is very localized -- score one for the RM Tasks!
Thu 11/11/1999 JosephJ RM: Finer granularity of tmpref end lock cheking We should add support for checking that there are no outstanding tmprefs and locks for *sub* trees of the call tree -- by allocating stack variables that save the value of the lock and tmpref on entry.
Thu 11/11/1999 JosephJ RM: More flexible display of object logs It would be nice to be able to display the integrated logs for an object and it's sub-object (optionally upto a certain level). We need to efficiently scan the global log looking for all entries which meet this criterion. How do we do this?
One way is to build up a hierarchical naming scheme for objects -- so we just do a prefix match to decide if the object is a descendent of the particular top-level object whose logs we are displaying.
All log entries will need to have the fully-qualified name of the object that created the log.
A simpler scheme is simply to walk the parent list and display it if one of the ancestors is the top-level object -- probably this will suffice for now.
TODO: we do need a way to keep logs available for objects that have gone away -- how to do this? And what are the implications for the above hierarchical display scheme?
Sat 11/13/1999 JosephJ Propery fill out arp sspd and maxrec I was using constant values. Now I pick them up from the adapter info.
11/16/1999 JosephJ MCAP Details Receive side: * Single multi-channel VC * 64-byte TTL array for each channel. * Incoming MCAP advertisement: - go through recv mcast addresses -- If we're intersted in it, add entry to channel. * New MCAST group to receive: - send out MCAP request 3 times and/or until resolved. * Timer: - Check TTL -- delete channel if required.
array[] of (TTL, NodeID) Unknown NodeID == FF (after bus reset). 64-bit bitmap of channels currently used
pMultiRecvDest - Vc - Array of (TTL, NodeID) - Bitmap - pChangeChannelsTask
To Do: 1. Mcap pkt parsing and generation code. 2. Task to create multi-channel recv VC. 3. Fake multi-channel VC handler. 4. Add recv mcast-address: Task to send out MCAP requests 5. Timer code: check TTL for mcast; check arp table -- timer stops if no activity. 6. Make ipfwadm generate fake MCAP recv packets. http://www.ietf.org/internet-drafts/draft-ietf-ip1394-ipv4-19.txt
11/18/1999 JosephJ Target_ip_address in arp response From Sony's Kaz Honda November 18, 1999: > So in ARP responses, the target_IP_address should be ignored. Regardless, we > fill it with the target_IP_address > of the ARP request (not the destination IP address). I don't think we're > doing anything wrong here. Hmm... Year, you're right. You're doing anything wrong literally. But for the driver like ours which emulates Ethernet, 1394ARP is transformed into EtherARP and the driver must fill target_IP_address in EtherARP. So filling target_IP_address with the destination IP address is more helpful.
So I now specify dest ip addr in the target_IP_address for arp responses.
11/18/1999 JosephJ Ethernet emulation for ICS on Win98 1. Create Ethernet VC on init IF. -- send/recv handlers -- 2. Add support for in fake calls.
VOID NdisCopyFromPacketToPacket( IN PNDIS_PACKET Destination, IN UINT DestinationOffset, IN UINT BytesToCopy, IN PNDIS_PACKET Source, IN UINT SourceOffset, OUT PUINT BytesCopied );
bp arp1394!arpIcsForwardPacketbp nic1394!NicMpSendPacketsbp arp1394!arpndreceivepacketbp arp1394!arpndsendcompletebp arp1394!arpIcsTranslatePktpTask=0x812f16e8; &OpType=0x812f17bc(0) &Delay=0x812f17b8
01/28/2000 JosephJ MCAP revisited For now, we'll implement both send & receive side, and use regular channels, instead of multi-channel receive because of the complications of implementing multichannel receive in NIC.
typedef struct { // Channel number. // UINT Channel;
// IP multicast group address bound to this channel. // IP_ADDRESS IpAddress;
// Absolute time at which this mapping will expire. // LARGE_INTEGER ExpieryTime;
// TBD // UINT Flags;
// NodeID of owner of this channel. // UINT NodeId;
} MCAP_CHANNEL_INFO;
MCAP_CHANNEL_INFO McapInfoArray[NUM_CHANNELS];
arpUpdateMcapInfo(pIF, pMcapPkt);
---------------------------------------Receive side:Every 10 seconds, we do the following:Check our list of local multicst addresses -- if any of them are in our mcapdatabase, initiate calls to them.If they are pointing to obsolete channels., we teardown calls from them.
This process only goes on as long as there are (a) local mcast ip addressesand (b) received advertise msgs.
Send side:Check channel db -- if address is assigned a channel, make call to it.
We're going to create CHANNEL "Destinations" for both send & receive.We'll thus be getting packets on channels even if we aren't interested in them. That's ok for now; Later we'll add the ioctl supportfor starting/stopping sends/receives.
So...
Destinations can be created if we're interested in either sending or receiving.
Periodic Task:It's period varies depending on activity.Can be woken up even if it's sleeping for a long time.
It does the following:
1. Checks for ageing of pRemoteIPs 2. Checks channel map and pDests, making sure that pDests are shut down if uninteresting. 3. Creates new pDests
ARP WORK ITEMS1. Age out entries2. Detect conflicts in local IP addresses.3. Display only unicast addresses in ipconfig.4. Don't queue packets to be sent out waiting for arp resolution -- only keep one packet.5. Request an other FIFO address if ther one we asked for is already taken (or ask nic1394 to allocate one for us).6. Remove "FATAL object locked w/o ..."7. Hook CONNECT/DISCONNECT notifications, and bring down stack (add some damping).
DEBUGGING SUPPORT1. Collect address-resolution time statistics.2. OID to get and report NIC-specific stats via IPFWADM.EXEx3. Option to make copies of packets on send and receive.4. Simple memory alloc wrappers.5. Get a13kd to work!x6. Keep track of reentrancyx7. MILL: make sure we call back to tcpip at passive.
IPFWADM modificationsDisplay address properly
ARP_COPY_RECV_PKTSARP_COPY_SEND_PKTSARP_COPY_PKTS
02/05/2000 Fixed bug dealing with failure of const buffer allocation. If arpSendIpPkt can't allocate a const buffer, we call arpCompleteSentPkt with special return value NDIS_STATUS_NOT_RESETTABLE so that it knows not to try to remove the const buffer. Of course, we'd break if the miniport sompletes a send with this status. We have an assert to catch that.
1. Change dest to include other params, change compare, "virtual channel"2. Re-write IntF/DeintIF to use msg normallzation3. Incorporate creation/deletion of maintenance task4. Maintainance task: go through LIP list for each LIP go through channel list if you find matching address find recv channel if found link?
go through RIP list for each RIP send VC if !marked dirty mark dirty if linked to channel pdest check if channel is still mapped to group if not, unlink. if required initiate link to new pdest (possibly channel) else //expired unlink from pdest and get rid of it
02/10/2000 RM API thoughts -- reducing stack depth See earlier references to this problem: 03/13/1999 JosephJ New RM APIs RmResumeTaskAsync and RmResumeTaskDelayed 03/25/1999 JosephJ IPDelInterface should be called at PASSIVE!
We can keep a list of tasks that need to be resumed in the stack record, and resume those tasks in the context of the first rm api call.
Pseudo code:
RmResumeTask: {
SET_RESUME_PARAM(pTask, Status); QUEUE_RESUME_TASK(pTask, pSR);
if (MUST_QUEUE_RESUMETASK(pSR)) { return; // RETURN }
SET_MUST_QUEUE_RESUMETASK(pSR);
while (resume-task queue not empty) { extract head of queue
// // Code from current version of RmResumeTask goes here... // NOTE: the queue could get added to while processing this. // } }
02/11/2000 JosephJ When calling Mill IPAddInterface, it expects the pConfigString unicode strings passed to it to be null terminated. We were hit by this because apparently we just happened to be null terminated until Mill build 2467.
02/13/2000 JosephJ ipfwadm additions -send -ref <name> -receive -ref <name> -businfo
ipfwadm.ini[Packets]arp1 =
[Names]<GUID> = "friendly name"
BUSINFO 0 1 2 3 4 5 6 0123456789012345678901234567890123456789012345678901234567890123 Channelmap = 0000000000000000000000000000000000000000000000000000000000000000 Generation = 0x1209 BusReset: 546 seconds ago
GUID NodeID MaxRec MaxSpeed MaxSpeedTo Handle State *1234900900098990 01 0998 00999 00098 98909890 ACTIVE IP1394-4 01 0998 00999 00098 98909890 ACTIVE
bp arpTaskIfMaintenancebp arp1394!arpTaskIfMaintenancebp arp1394!arpStartIfMaintenanceTaskbp arp1394!arpTryStopIfMaintenanceTaskbp arp1394!arpMaintainOneRemoteIpbp arp1394!arpMaintainOneLocalIpbp arp1394!arpDoMcapDbMaintenancebp arp1394!arpUpdateLocalIpDestbp arp1394!arpUpdateRemoteIpDestbp arp1394!arpDeinitRemoteIpbp arp1394!arpDeinitDestination
bp arp1394!arpIoctlRecvPacketbp arp1394!arpIoctlSendPacketbp arp1394!arpIoctlGetBusInfobp arp1394!arpProcessMcapPkt
02/16/2000 JosephJ RM APIs observation Don't write code after "SuspendTask/PendTask" -- it may not get executed until after the task has been resumed -- this is counter intuitive. For example: we were setting pIF->pBroadcastDest to a pDest which was returned after calling RmPendTaskOnOtherTask -- well the code to set pIF->pBroadcastDest was not actually executed until the task was complete -- the task completed in the context of the call to RmPendTaskOnOtherTask itself! One more reason to implement the resume-task-at-top-level semantings. (see 02/10/2000 entry).
03/28/2000 JosephJ Outstanding RM work items. 03/07/1999 JosephJ Registering root objects with RM 03/09/1999 JosephJ Consider making init functions fail etc if associated object is03/09/1999 Special allocator for unload-related tasks
08/15/00 - Route Cache Entries. When the arp module is passed a Route Cache Entry, then it should validate its contents because the contents could point to another destination.
11/15/00 - Only applicable to bridge mode - The bridge sends STA packets to detect loops. These packets have a unique EtherType. Arp1394 now acccepts this EtherType and propogates it over the wire as part of the Link Layer (IP1394 Encapsulation) header.
The receiving arp1394 recognises the STA EtherType and constructs a new Ethernet Header for the Packet as it is being translated into Ethernet.
In bridge mode - The Remote Ip structure has an Ethernet Destination. This causes problems when the pRemoteIp is used to construct an Arp Packet. Therefore the actual Ip Address should be stored in pRemoteIp->IpAddress, however all RemoteIp Lookups are done on the basis of the pRemoteIp->Key
12/14/00 - A deadlock was uncovered in RmLookupObjectInGroup. To fix it, the function can no longer guarantee the caller that the object will be created and locked in the same operation. The Group lock will not be held in conjunction with the Object Lock.
12/14/01 - The PoMgmt code is being modified (for which notes were not added), so that PoMgmt is always supported by the ARP module except in the corner case wherein the Interface has not initialized yet. This is being done so that the arp module does not get unbound from the nic when the machine is standing by and thereby retains its IP address through the standby operation.
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