217 lines
3.7 KiB
C
217 lines
3.7 KiB
C
/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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ifdbase.c
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Abstract:
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RIP Interface Data Base Manager
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All functions called with the database locked
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Author:
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Stefan Solomon 07/06/1995
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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#define ifhashindex(IfIndex) (IfIndex) % IF_INDEX_HASH_TABLE_SIZE
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#define adapterhashindex(AdapterIndex) (AdapterIndex) % ADAPTER_INDEX_HASH_TABLE_SIZE
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USHORT
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tickcount(UINT linkspeed);
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VOID
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InitIfDbase(VOID)
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{
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int i;
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PLIST_ENTRY HtBucketp;
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InitializeListHead(&IndexIfList);
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InitializeListHead(&DiscardedIfList);
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for(i=0, HtBucketp = IfIndexHt;
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i<IF_INDEX_HASH_TABLE_SIZE;
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i++, HtBucketp++) {
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InitializeListHead(HtBucketp);
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}
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for(i=0, HtBucketp = AdapterIndexHt;
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i<ADAPTER_INDEX_HASH_TABLE_SIZE;
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i++, HtBucketp++) {
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InitializeListHead(HtBucketp);
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}
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}
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PICB
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GetInterfaceByIndex(ULONG InterfaceIndex)
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{
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PLIST_ENTRY lep, hashbucketp;
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PICB icbp;
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hashbucketp = &IfIndexHt[ifhashindex(InterfaceIndex)];
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lep = hashbucketp->Flink;
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while(lep != hashbucketp) {
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icbp = CONTAINING_RECORD(lep, ICB, IfHtLinkage);
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if(icbp->InterfaceIndex == InterfaceIndex) {
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return icbp;
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}
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lep = lep->Flink;
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}
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return NULL;
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}
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PICB
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GetInterfaceByAdapterIndex(ULONG AdapterIndex)
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{
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PLIST_ENTRY lep, hashbucketp;
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PICB icbp;
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hashbucketp = &AdapterIndexHt[adapterhashindex(AdapterIndex)];
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lep = hashbucketp->Flink;
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while(lep != hashbucketp) {
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icbp = CONTAINING_RECORD(lep, ICB, AdapterHtLinkage);
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if(icbp->AdapterBindingInfo.AdapterIndex == AdapterIndex) {
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return icbp;
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}
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lep = lep->Flink;
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}
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return NULL;
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}
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VOID
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AddIfToDb(PICB icbp)
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{
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int hv;
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PLIST_ENTRY lep;
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PICB list_icbp;
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BOOL Done = FALSE;
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hv = ifhashindex(icbp->InterfaceIndex);
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InsertTailList(&IfIndexHt[hv], &icbp->IfHtLinkage);
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// insert in the list ordered by index
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lep = IndexIfList.Flink;
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while(lep != &IndexIfList)
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{
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list_icbp = CONTAINING_RECORD(lep, ICB, IfListLinkage);
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if (list_icbp->InterfaceIndex > icbp->InterfaceIndex) {
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InsertTailList(lep, &icbp->IfListLinkage);
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Done = TRUE;
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break;
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}
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lep = lep->Flink;
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}
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if(!Done) {
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InsertTailList(lep, &icbp->IfListLinkage);
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}
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}
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VOID
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RemoveIfFromDb(PICB icbp)
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{
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RemoveEntryList(&icbp->IfListLinkage);
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RemoveEntryList(&icbp->IfHtLinkage);
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}
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VOID
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BindIf(PICB icbp,
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PIPX_ADAPTER_BINDING_INFO BindingInfop)
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{
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int hv;
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icbp->AdapterBindingInfo = *BindingInfop;
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// set then tick count if not internal interface
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if(icbp->InterfaceIndex != 0) {
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icbp->LinkTickCount = tickcount(BindingInfop->LinkSpeed);
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}
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hv = adapterhashindex(icbp->AdapterBindingInfo.AdapterIndex);
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InsertTailList(&AdapterIndexHt[hv], &icbp->AdapterHtLinkage);
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}
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/*++
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Function: UnbindIf
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Descr: removes the if CB from the adapters hash table
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sets the adapter index in the if CB to INVALID_ADAPTER_INDEX
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--*/
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VOID
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UnbindIf(PICB icbp)
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{
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RemoveEntryList(&icbp->AdapterHtLinkage);
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icbp->AdapterBindingInfo.AdapterIndex = INVALID_ADAPTER_INDEX;
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}
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/*++
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Function: tickcount
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Descr: gets nr of ticks to send a 576 bytes packet over this link
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Argument: link speed as a multiple of 100 bps
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--*/
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USHORT
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tickcount(UINT linkspeed)
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{
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USHORT tc;
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if(linkspeed == 0) {
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return 1;
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}
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if(linkspeed >= 10000) {
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// link speed >= 1M bps
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return 1;
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}
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else
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{
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// compute the necessary time to send a 576 bytes packet over this
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// line and express it as nr of ticks.
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// One tick = 55ms
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// time in ms to send 576 bytes (assuming 10 bits/byte for serial line)
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tc = 57600 / linkspeed;
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// in ticks
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tc = tc / 55 + 1;
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return tc;
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}
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}
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