LeakyBucket.c
/**********************************************************************
* LEAKYBUCKET.C
* This file contains the routines related to Leaky Bucket Algorithm.
***********************************************************************/
#include "headers.h"
/*********************************************************************
* Function - UpdateTokenCount()
*
* Description - This function calculates the token count for each
* channel and updates the same in Adapter strucuture.
*
* Parameters - Adapter: Pointer to the Adapter structure.
*
* Returns - None
**********************************************************************/
static VOID UpdateTokenCount(register PMINI_ADAPTER Adapter)
{
ULONG liCurrentTime;
INT i = 0;
struct timeval tv;
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "=====>\n");
if(NULL == Adapter)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "Adapter found NULL!\n");
return;
}
do_gettimeofday(&tv);
for(i = 0; i < NO_OF_QUEUES; i++)
{
if(TRUE == Adapter->PackInfo[i].bValid &&
(1 == Adapter->PackInfo[i].ucDirection))
{
liCurrentTime = ((tv.tv_sec-
Adapter->PackInfo[i].stLastUpdateTokenAt.tv_sec)*1000 +
(tv.tv_usec-Adapter->PackInfo[i].stLastUpdateTokenAt.tv_usec)/
1000);
if(0!=liCurrentTime)
{
Adapter->PackInfo[i].uiCurrentTokenCount += (ULONG)
((Adapter->PackInfo[i].uiMaxAllowedRate) *
((ULONG)((liCurrentTime)))/1000);
memcpy(&Adapter->PackInfo[i].stLastUpdateTokenAt,
&tv, sizeof(struct timeval));
Adapter->PackInfo[i].liLastUpdateTokenAt = liCurrentTime;
if((Adapter->PackInfo[i].uiCurrentTokenCount) >=
Adapter->PackInfo[i].uiMaxBucketSize)
{
Adapter->PackInfo[i].uiCurrentTokenCount =
Adapter->PackInfo[i].uiMaxBucketSize;
}
}
}
}
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "<=====\n");
return;
}
/*********************************************************************
* Function - IsPacketAllowedForFlow()
*
* Description - This function checks whether the given packet from the
* specified queue can be allowed for transmission by
* checking the token count.
*
* Parameters - Adapter : Pointer to the Adpater structure.
* - iQIndex : The queue Identifier.
* - ulPacketLength: Number of bytes to be transmitted.
*
* Returns - The number of bytes allowed for transmission.
*
***********************************************************************/
static ULONG GetSFTokenCount(PMINI_ADAPTER Adapter, PacketInfo *psSF)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "IsPacketAllowedForFlow ===>");
/* Validate the parameters */
if(NULL == Adapter || (psSF < Adapter->PackInfo &&
(uintptr_t)psSF > (uintptr_t) &Adapter->PackInfo[HiPriority]))
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "IPAFF: Got wrong Parameters:Adapter: %p, QIndex: %zd\n", Adapter, (psSF-Adapter->PackInfo));
return 0;
}
if(FALSE != psSF->bValid && psSF->ucDirection)
{
if(0 != psSF->uiCurrentTokenCount)
{
return psSF->uiCurrentTokenCount;
}
else
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "Not enough tokens in queue %zd Available %u\n",
psSF-Adapter->PackInfo, psSF->uiCurrentTokenCount);
psSF->uiPendedLast = 1;
}
}
else
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "IPAFF: Queue %zd not valid\n", psSF-Adapter->PackInfo);
}
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TOKEN_COUNTS, DBG_LVL_ALL, "IsPacketAllowedForFlow <===");
return 0;
}
/**
@ingroup tx_functions
This function despatches packet from the specified queue.
@return Zero(success) or Negative value(failure)
*/
static INT SendPacketFromQueue(PMINI_ADAPTER Adapter,/**<Logical Adapter*/
PacketInfo *psSF, /**<Queue identifier*/
struct sk_buff* Packet) /**<Pointer to the packet to be sent*/
{
INT Status=STATUS_FAILURE;
UINT uiIndex =0,PktLen = 0;
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, SEND_QUEUE, DBG_LVL_ALL, "=====>");
if(!Adapter || !Packet || !psSF)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, SEND_QUEUE, DBG_LVL_ALL, "Got NULL Adapter or Packet");
return -EINVAL;
}
if(psSF->liDrainCalculated==0)
{
psSF->liDrainCalculated = jiffies;
}
///send the packet to the fifo..
PktLen = Packet->len;
Status = SetupNextSend(Adapter, Packet, psSF->usVCID_Value);
if(Status == 0)
{
for(uiIndex = 0 ; uiIndex < MIBS_MAX_HIST_ENTRIES ; uiIndex++)
{ if((PktLen <= MIBS_PKTSIZEHIST_RANGE*(uiIndex+1)) && (PktLen > MIBS_PKTSIZEHIST_RANGE*(uiIndex)))
Adapter->aTxPktSizeHist[uiIndex]++;
}
}
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, SEND_QUEUE, DBG_LVL_ALL, "<=====");
return Status;
}
/************************************************************************
* Function - CheckAndSendPacketFromIndex()
*
* Description - This function dequeues the data/control packet from the
* specified queue for transmission.
*
* Parameters - Adapter : Pointer to the driver control structure.
* - iQIndex : The queue Identifier.
*
* Returns - None.
*
****************************************************************************/
static VOID CheckAndSendPacketFromIndex(PMINI_ADAPTER Adapter, PacketInfo *psSF)
{
struct sk_buff *QueuePacket=NULL;
char *pControlPacket = NULL;
INT Status=0;
int iPacketLen=0;
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "%zd ====>", (psSF-Adapter->PackInfo));
if((psSF != &Adapter->PackInfo[HiPriority]) && Adapter->LinkUpStatus && atomic_read(&psSF->uiPerSFTxResourceCount))//Get data packet
{
if(!psSF->ucDirection )
return;
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "UpdateTokenCount ");
if(Adapter->IdleMode || Adapter->bPreparingForLowPowerMode)
return; /* in idle mode */
// Check for Free Descriptors
if(atomic_read(&Adapter->CurrNumFreeTxDesc) <= MINIMUM_PENDING_DESCRIPTORS)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, " No Free Tx Descriptor(%d) is available for Data pkt..",atomic_read(&Adapter->CurrNumFreeTxDesc));
return ;
}
spin_lock_bh(&psSF->SFQueueLock);
QueuePacket=psSF->FirstTxQueue;
if(QueuePacket)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Dequeuing Data Packet");
if(psSF->bEthCSSupport)
iPacketLen = QueuePacket->len;
else
iPacketLen = QueuePacket->len-ETH_HLEN;
iPacketLen<<=3;
if(iPacketLen <= GetSFTokenCount(Adapter, psSF))
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Allowed bytes %d",
(iPacketLen >> 3));
DEQUEUEPACKET(psSF->FirstTxQueue,psSF->LastTxQueue);
psSF->uiCurrentBytesOnHost -= (QueuePacket->len);
psSF->uiCurrentPacketsOnHost--;
atomic_dec(&Adapter->TotalPacketCount);
spin_unlock_bh(&psSF->SFQueueLock);
Status = SendPacketFromQueue(Adapter, psSF, QueuePacket);
psSF->uiPendedLast = FALSE;
}
else
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "For Queue: %zd\n", psSF-Adapter->PackInfo);
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "\nAvailable Tokens = %d required = %d\n",
psSF->uiCurrentTokenCount, iPacketLen);
//this part indicates that because of non-availability of the tokens
//pkt has not been send out hence setting the pending flag indicating the host to send it out
//first next iteration .
psSF->uiPendedLast = TRUE;
spin_unlock_bh(&psSF->SFQueueLock);
}
}
else
{
spin_unlock_bh(&psSF->SFQueueLock);
}
}
else
{
if((atomic_read(&Adapter->CurrNumFreeTxDesc) > 0 ) &&
(atomic_read(&Adapter->index_rd_txcntrlpkt) !=
atomic_read(&Adapter->index_wr_txcntrlpkt))
)
{
pControlPacket = Adapter->txctlpacket
[(atomic_read(&Adapter->index_rd_txcntrlpkt)%MAX_CNTRL_PKTS)];
if(pControlPacket)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Sending Control packet");
Status = SendControlPacket(Adapter, pControlPacket);
if(STATUS_SUCCESS==Status)
{
spin_lock_bh(&psSF->SFQueueLock);
psSF->NumOfPacketsSent++;
psSF->uiSentBytes+=((PLEADER)pControlPacket)->PLength;
psSF->uiSentPackets++;
atomic_dec(&Adapter->TotalPacketCount);
psSF->uiCurrentBytesOnHost -= ((PLEADER)pControlPacket)->PLength;
psSF->uiCurrentPacketsOnHost--;
atomic_inc(&Adapter->index_rd_txcntrlpkt);
spin_unlock_bh(&psSF->SFQueueLock);
}
else
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "SendControlPacket Failed\n");
}
else
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, " Control Pkt is not available, Indexing is wrong....");
}
}
}
}
/*******************************************************************
* Function - transmit_packets()
*
* Description - This function transmits the packets from different
* queues, if free descriptors are available on target.
*
* Parameters - Adapter: Pointer to the Adapter structure.
*
* Returns - None.
********************************************************************/
VOID transmit_packets(PMINI_ADAPTER Adapter)
{
UINT uiPrevTotalCount = 0;
int iIndex = 0;
BOOLEAN exit_flag = TRUE ;
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "=====>");
if(NULL == Adapter)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX,TX_PACKETS, DBG_LVL_ALL, "Got NULL Adapter");
return;
}
if(Adapter->device_removed == TRUE)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Device removed");
return;
}
BCM_DEBUG_PRINT (Adapter, DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "\nUpdateTokenCount ====>\n");
UpdateTokenCount(Adapter);
BCM_DEBUG_PRINT (Adapter, DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "\nPruneQueueAllSF ====>\n");
PruneQueueAllSF(Adapter);
uiPrevTotalCount = atomic_read(&Adapter->TotalPacketCount);
for(iIndex=HiPriority;iIndex>=0;iIndex--)
{
if( !uiPrevTotalCount || (TRUE == Adapter->device_removed))
break;
if(Adapter->PackInfo[iIndex].bValid &&
Adapter->PackInfo[iIndex].uiPendedLast &&
Adapter->PackInfo[iIndex].uiCurrentBytesOnHost)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Calling CheckAndSendPacketFromIndex..");
CheckAndSendPacketFromIndex(Adapter, &Adapter->PackInfo[iIndex]);
uiPrevTotalCount--;
}
}
while(uiPrevTotalCount > 0 && !Adapter->device_removed)
{
exit_flag = TRUE ;
//second iteration to parse non-pending queues
for(iIndex=HiPriority;iIndex>=0;iIndex--)
{
if( !uiPrevTotalCount || (TRUE == Adapter->device_removed))
break;
if(Adapter->PackInfo[iIndex].bValid &&
Adapter->PackInfo[iIndex].uiCurrentBytesOnHost &&
!Adapter->PackInfo[iIndex].uiPendedLast )
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "Calling CheckAndSendPacketFromIndex..");
CheckAndSendPacketFromIndex(Adapter, &Adapter->PackInfo[iIndex]);
uiPrevTotalCount--;
exit_flag = FALSE;
}
}
if(Adapter->IdleMode || Adapter->bPreparingForLowPowerMode)
{
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "In Idle Mode\n");
break;
}
if(exit_flag == TRUE )
break ;
}/* end of inner while loop */
update_per_cid_rx (Adapter);
Adapter->txtransmit_running = 0;
BCM_DEBUG_PRINT(Adapter,DBG_TYPE_TX, TX_PACKETS, DBG_LVL_ALL, "<======");
}