openwrtv3/target/linux/s3c24xx/files-2.6.31/drivers/ar6000/htc/htc_send.c

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2009-09-21 18:29:46 +00:00
/*
*
* Copyright (c) 2007 Atheros Communications Inc.
* All rights reserved.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
*
*
*/
#include "htc_internal.h"
#define DO_EP_TX_COMPLETION(ep,p) \
{ \
(p)->Completion = NULL; \
(ep)->EpCallBacks.EpTxComplete((ep)->EpCallBacks.pContext,(p)); \
}
/* call the distribute credits callback with the distribution */
#define DO_DISTRIBUTION(t,reason,description,pList) \
{ \
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, \
(" calling distribute function (%s) (dfn:0x%X, ctxt:0x%X, dist:0x%X) \n", \
(description), \
(A_UINT32)(t)->DistributeCredits, \
(A_UINT32)(t)->pCredDistContext, \
(A_UINT32)pList)); \
(t)->DistributeCredits((t)->pCredDistContext, \
(pList), \
(reason)); \
}
/* our internal send packet completion handler when packets are submited to the AR6K device
* layer */
static void HTCSendPktCompletionHandler(void *Context, HTC_PACKET *pPacket)
{
HTC_TARGET *target = (HTC_TARGET *)Context;
HTC_ENDPOINT *pEndpoint = &target->EndPoint[pPacket->Endpoint];
if (A_FAILED(pPacket->Status)) {
AR_DEBUG_PRINTF(ATH_DEBUG_ERR,
("HTCSendPktCompletionHandler: request failed (status:%d, ep:%d) \n",
pPacket->Status, pPacket->Endpoint));
}
/* first, fixup the head room we allocated */
pPacket->pBuffer += HTC_HDR_LENGTH;
/* do completion */
DO_EP_TX_COMPLETION(pEndpoint,pPacket);
}
A_STATUS HTCIssueSend(HTC_TARGET *target, HTC_PACKET *pPacket, A_UINT8 SendFlags)
{
A_STATUS status;
A_UINT8 *pHdrBuf;
A_BOOL sync = FALSE;
/* caller always provides headrooom */
pPacket->pBuffer -= HTC_HDR_LENGTH;
pHdrBuf = pPacket->pBuffer;
/* setup frame header */
A_SET_UINT16_FIELD(pHdrBuf,HTC_FRAME_HDR,PayloadLen,(A_UINT16)pPacket->ActualLength);
A_SET_UINT8_FIELD(pHdrBuf,HTC_FRAME_HDR,Flags,SendFlags);
A_SET_UINT8_FIELD(pHdrBuf,HTC_FRAME_HDR,EndpointID, (A_UINT8)pPacket->Endpoint);
if (pPacket->Completion == NULL) {
/* mark that this request was synchronously issued */
sync = TRUE;
}
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,
("+-HTCIssueSend: transmit length : %d (%s) \n",
pPacket->ActualLength + HTC_HDR_LENGTH,
sync ? "SYNC" : "ASYNC" ));
/* send message to device */
status = DevSendPacket(&target->Device,
pPacket,
pPacket->ActualLength + HTC_HDR_LENGTH);
if (sync) {
/* use local sync variable. If this was issued asynchronously, pPacket is no longer
* safe to access. */
pPacket->pBuffer += HTC_HDR_LENGTH;
}
/* if this request was asynchronous, the packet completion routine will be invoked by
* the device layer when the HIF layer completes the request */
return status;
}
/* try to send the current packet or a packet at the head of the TX queue,
* if there are no credits, the packet remains in the queue. */
static void HTCTrySend(HTC_TARGET *target,
HTC_PACKET *pPacketToSend,
HTC_ENDPOINT_ID ep)
{
HTC_PACKET *pPacket;
HTC_ENDPOINT *pEndpoint;
int creditsRequired;
A_UINT8 sendFlags;
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,("+HTCTrySend (pPkt:0x%X)\n",(A_UINT32)pPacketToSend));
pEndpoint = &target->EndPoint[ep];
LOCK_HTC_TX(target);
if (pPacketToSend != NULL) {
/* caller supplied us a packet to queue to the tail of the HTC TX queue before
* we check the tx queue */
HTC_PACKET_ENQUEUE(&pEndpoint->TxQueue,pPacketToSend);
pEndpoint->CurrentTxQueueDepth++;
}
/* now drain the TX queue for transmission as long as we have enough
* credits */
while (1) {
if (HTC_QUEUE_EMPTY(&pEndpoint->TxQueue)) {
/* nothing in the queue */
break;
}
sendFlags = 0;
/* get packet at head, but don't remove it */
pPacket = HTC_GET_PKT_AT_HEAD(&pEndpoint->TxQueue);
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,(" Got head packet:0x%X , Queue Depth: %d\n",
(A_UINT32)pPacket, pEndpoint->CurrentTxQueueDepth));
/* figure out how many credits this message requires */
creditsRequired = pPacket->ActualLength + HTC_HDR_LENGTH;
creditsRequired += target->TargetCreditSize - 1;
creditsRequired /= target->TargetCreditSize;
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,(" Creds Required:%d Got:%d\n",
creditsRequired, pEndpoint->CreditDist.TxCredits));
if (pEndpoint->CreditDist.TxCredits < creditsRequired) {
/* not enough credits */
if (pPacket->Endpoint == ENDPOINT_0) {
/* leave it in the queue */
break;
}
/* invoke the registered distribution function only if this is not
* endpoint 0, we let the driver layer provide more credits if it can.
* We pass the credit distribution list starting at the endpoint in question
* */
/* set how many credits we need */
pEndpoint->CreditDist.TxCreditsSeek =
creditsRequired - pEndpoint->CreditDist.TxCredits;
DO_DISTRIBUTION(target,
HTC_CREDIT_DIST_SEEK_CREDITS,
"Seek Credits",
&pEndpoint->CreditDist);
pEndpoint->CreditDist.TxCreditsSeek = 0;
if (pEndpoint->CreditDist.TxCredits < creditsRequired) {
/* still not enough credits to send, leave packet in the queue */
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,
(" Not enough credits for ep %d leaving packet in queue..\n",
pPacket->Endpoint));
break;
}
}
pEndpoint->CreditDist.TxCredits -= creditsRequired;
INC_HTC_EP_STAT(pEndpoint, TxCreditsConsummed, creditsRequired);
/* check if we need credits */
if (pEndpoint->CreditDist.TxCredits < pEndpoint->CreditDist.TxCreditsPerMaxMsg) {
sendFlags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
INC_HTC_EP_STAT(pEndpoint, TxCreditLowIndications, 1);
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,(" Host Needs Credits \n"));
}
/* now we can fully dequeue */
pPacket = HTC_PACKET_DEQUEUE(&pEndpoint->TxQueue);
pEndpoint->CurrentTxQueueDepth--;
INC_HTC_EP_STAT(pEndpoint, TxIssued, 1);
UNLOCK_HTC_TX(target);
HTCIssueSend(target, pPacket, sendFlags);
LOCK_HTC_TX(target);
/* go back and check for more messages */
}
if (pEndpoint->CurrentTxQueueDepth >= pEndpoint->MaxTxQueueDepth) {
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, (" Endpoint %d, TX queue is full, Depth:%d, Max:%d \n",
ep, pEndpoint->CurrentTxQueueDepth, pEndpoint->MaxTxQueueDepth));
UNLOCK_HTC_TX(target);
/* queue is now full, let caller know */
if (pEndpoint->EpCallBacks.EpSendFull != NULL) {
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, (" Calling driver's send full callback.... \n"));
pEndpoint->EpCallBacks.EpSendFull(pEndpoint->EpCallBacks.pContext, ep);
}
} else {
UNLOCK_HTC_TX(target);
/* queue is now available for new packet, let caller know */
if (pEndpoint->EpCallBacks.EpSendAvail)
pEndpoint->EpCallBacks.EpSendAvail(pEndpoint->EpCallBacks.pContext, ep);
}
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,("-HTCTrySend: \n"));
}
/* HTC API - HTCSendPkt */
A_STATUS HTCSendPkt(HTC_HANDLE HTCHandle, HTC_PACKET *pPacket)
{
HTC_TARGET *target = GET_HTC_TARGET_FROM_HANDLE(HTCHandle);
HTC_ENDPOINT *pEndpoint;
HTC_ENDPOINT_ID ep;
A_STATUS status = A_OK;
AR_DEBUG_PRINTF(ATH_DEBUG_SEND,
("+HTCSendPkt: Enter endPointId: %d, buffer: 0x%X, length: %d \n",
pPacket->Endpoint, (A_UINT32)pPacket->pBuffer, pPacket->ActualLength));
ep = pPacket->Endpoint;
AR_DEBUG_ASSERT(ep < ENDPOINT_MAX);
pEndpoint = &target->EndPoint[ep];
do {
if (HTC_STOPPING(target)) {
status = A_ECANCELED;
pPacket->Status = status;
DO_EP_TX_COMPLETION(pEndpoint,pPacket);
break;
}
/* everything sent through this interface is asynchronous */
/* fill in HTC completion routines */
pPacket->Completion = HTCSendPktCompletionHandler;
pPacket->pContext = target;
HTCTrySend(target, pPacket, ep);
} while (FALSE);
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, ("-HTCSendPkt \n"));
return status;
}
/* check TX queues to drain because of credit distribution update */
static INLINE void HTCCheckEndpointTxQueues(HTC_TARGET *target)
{
HTC_ENDPOINT *pEndpoint;
HTC_ENDPOINT_CREDIT_DIST *pDistItem;
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, ("+HTCCheckEndpointTxQueues \n"));
pDistItem = target->EpCreditDistributionListHead;
/* run through the credit distribution list to see
* if there are packets queued
* NOTE: no locks need to be taken since the distribution list
* is not dynamic (cannot be re-ordered) and we are not modifying any state */
while (pDistItem != NULL) {
pEndpoint = (HTC_ENDPOINT *)pDistItem->pHTCReserved;
if (pEndpoint->CurrentTxQueueDepth > 0) {
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, (" Ep %d has %d credits and %d Packets in TX Queue \n",
pDistItem->Endpoint, pEndpoint->CreditDist.TxCredits, pEndpoint->CurrentTxQueueDepth));
/* try to start the stalled queue, this list is ordered by priority.
* Highest priority queue get's processed first, if there are credits available the
* highest priority queue will get a chance to reclaim credits from lower priority
* ones */
HTCTrySend(target, NULL, pDistItem->Endpoint);
}
pDistItem = pDistItem->pNext;
}
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, ("-HTCCheckEndpointTxQueues \n"));
}
/* process credit reports and call distribution function */
void HTCProcessCreditRpt(HTC_TARGET *target, HTC_CREDIT_REPORT *pRpt, int NumEntries, HTC_ENDPOINT_ID FromEndpoint)
{
int i;
HTC_ENDPOINT *pEndpoint;
int totalCredits = 0;
A_BOOL doDist = FALSE;
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, ("+HTCProcessCreditRpt, Credit Report Entries:%d \n", NumEntries));
/* lock out TX while we update credits */
LOCK_HTC_TX(target);
for (i = 0; i < NumEntries; i++, pRpt++) {
if (pRpt->EndpointID >= ENDPOINT_MAX) {
AR_DEBUG_ASSERT(FALSE);
break;
}
pEndpoint = &target->EndPoint[pRpt->EndpointID];
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, (" Endpoint %d got %d credits \n",
pRpt->EndpointID, pRpt->Credits));
#ifdef HTC_EP_STAT_PROFILING
INC_HTC_EP_STAT(pEndpoint, TxCreditRpts, 1);
INC_HTC_EP_STAT(pEndpoint, TxCreditsReturned, pRpt->Credits);
if (FromEndpoint == pRpt->EndpointID) {
/* this credit report arrived on the same endpoint indicating it arrived in an RX
* packet */
INC_HTC_EP_STAT(pEndpoint, TxCreditsFromRx, pRpt->Credits);
INC_HTC_EP_STAT(pEndpoint, TxCreditRptsFromRx, 1);
} else if (FromEndpoint == ENDPOINT_0) {
/* this credit arrived on endpoint 0 as a NULL message */
INC_HTC_EP_STAT(pEndpoint, TxCreditsFromEp0, pRpt->Credits);
INC_HTC_EP_STAT(pEndpoint, TxCreditRptsFromEp0, 1);
} else {
/* arrived on another endpoint */
INC_HTC_EP_STAT(pEndpoint, TxCreditsFromOther, pRpt->Credits);
INC_HTC_EP_STAT(pEndpoint, TxCreditRptsFromOther, 1);
}
#endif
if (ENDPOINT_0 == pRpt->EndpointID) {
/* always give endpoint 0 credits back */
pEndpoint->CreditDist.TxCredits += pRpt->Credits;
} else {
/* for all other endpoints, update credits to distribute, the distribution function
* will handle giving out credits back to the endpoints */
pEndpoint->CreditDist.TxCreditsToDist += pRpt->Credits;
/* flag that we have to do the distribution */
doDist = TRUE;
}
totalCredits += pRpt->Credits;
}
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, (" Report indicated %d credits to distribute \n", totalCredits));
if (doDist) {
/* this was a credit return based on a completed send operations
* note, this is done with the lock held */
DO_DISTRIBUTION(target,
HTC_CREDIT_DIST_SEND_COMPLETE,
"Send Complete",
target->EpCreditDistributionListHead->pNext);
}
UNLOCK_HTC_TX(target);
if (totalCredits) {
HTCCheckEndpointTxQueues(target);
}
AR_DEBUG_PRINTF(ATH_DEBUG_SEND, ("-HTCProcessCreditRpt \n"));
}
/* flush endpoint TX queue */
static void HTCFlushEndpointTX(HTC_TARGET *target, HTC_ENDPOINT *pEndpoint, HTC_TX_TAG Tag)
{
HTC_PACKET *pPacket;
HTC_PACKET_QUEUE discardQueue;
/* initialize the discard queue */
INIT_HTC_PACKET_QUEUE(&discardQueue);
LOCK_HTC_TX(target);
/* interate from the front of the TX queue and flush out packets */
ITERATE_OVER_LIST_ALLOW_REMOVE(&pEndpoint->TxQueue, pPacket, HTC_PACKET, ListLink) {
/* check for removal */
if ((HTC_TX_PACKET_TAG_ALL == Tag) || (Tag == pPacket->PktInfo.AsTx.Tag)) {
/* remove from queue */
HTC_PACKET_REMOVE(pPacket);
/* add it to the discard pile */
HTC_PACKET_ENQUEUE(&discardQueue, pPacket);
pEndpoint->CurrentTxQueueDepth--;
}
} ITERATE_END;
UNLOCK_HTC_TX(target);
/* empty the discard queue */
while (1) {
pPacket = HTC_PACKET_DEQUEUE(&discardQueue);
if (NULL == pPacket) {
break;
}
pPacket->Status = A_ECANCELED;
AR_DEBUG_PRINTF(ATH_DEBUG_TRC, (" Flushing TX packet:0x%X, length:%d, ep:%d tag:0x%X \n",
(A_UINT32)pPacket, pPacket->ActualLength, pPacket->Endpoint, pPacket->PktInfo.AsTx.Tag));
DO_EP_TX_COMPLETION(pEndpoint,pPacket);
}
}
void DumpCreditDist(HTC_ENDPOINT_CREDIT_DIST *pEPDist)
{
#ifdef DEBUG
HTC_ENDPOINT *pEndpoint = (HTC_ENDPOINT *)pEPDist->pHTCReserved;
#endif
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, ("--- EP : %d ServiceID: 0x%X --------------\n",
pEPDist->Endpoint, pEPDist->ServiceID));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" this:0x%X next:0x%X prev:0x%X\n",
(A_UINT32)pEPDist, (A_UINT32)pEPDist->pNext, (A_UINT32)pEPDist->pPrev));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" DistFlags : 0x%X \n", pEPDist->DistFlags));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditsNorm : %d \n", pEPDist->TxCreditsNorm));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditsMin : %d \n", pEPDist->TxCreditsMin));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCredits : %d \n", pEPDist->TxCredits));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditsAssigned : %d \n", pEPDist->TxCreditsAssigned));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditsSeek : %d \n", pEPDist->TxCreditsSeek));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditSize : %d \n", pEPDist->TxCreditSize));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditsPerMaxMsg : %d \n", pEPDist->TxCreditsPerMaxMsg));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxCreditsToDist : %d \n", pEPDist->TxCreditsToDist));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, (" TxQueueDepth : %d \n", pEndpoint->CurrentTxQueueDepth));
AR_DEBUG_PRINTF(ATH_DEBUG_ANY, ("----------------------------------------------------\n"));
}
void DumpCreditDistStates(HTC_TARGET *target)
{
HTC_ENDPOINT_CREDIT_DIST *pEPList = target->EpCreditDistributionListHead;
while (pEPList != NULL) {
DumpCreditDist(pEPList);
pEPList = pEPList->pNext;
}
if (target->DistributeCredits != NULL) {
DO_DISTRIBUTION(target,
HTC_DUMP_CREDIT_STATE,
"Dump State",
NULL);
}
}
/* flush all send packets from all endpoint queues */
void HTCFlushSendPkts(HTC_TARGET *target)
{
HTC_ENDPOINT *pEndpoint;
int i;
DumpCreditDistStates(target);
for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
pEndpoint = &target->EndPoint[i];
if (pEndpoint->ServiceID == 0) {
/* not in use.. */
continue;
}
HTCFlushEndpointTX(target,pEndpoint,HTC_TX_PACKET_TAG_ALL);
}
}
/* HTC API to flush an endpoint's TX queue*/
void HTCFlushEndpoint(HTC_HANDLE HTCHandle, HTC_ENDPOINT_ID Endpoint, HTC_TX_TAG Tag)
{
HTC_TARGET *target = GET_HTC_TARGET_FROM_HANDLE(HTCHandle);
HTC_ENDPOINT *pEndpoint = &target->EndPoint[Endpoint];
if (pEndpoint->ServiceID == 0) {
AR_DEBUG_ASSERT(FALSE);
/* not in use.. */
return;
}
HTCFlushEndpointTX(target, pEndpoint, Tag);
}
/* HTC API to indicate activity to the credit distribution function */
void HTCIndicateActivityChange(HTC_HANDLE HTCHandle,
HTC_ENDPOINT_ID Endpoint,
A_BOOL Active)
{
HTC_TARGET *target = GET_HTC_TARGET_FROM_HANDLE(HTCHandle);
HTC_ENDPOINT *pEndpoint = &target->EndPoint[Endpoint];
A_BOOL doDist = FALSE;
if (pEndpoint->ServiceID == 0) {
AR_DEBUG_ASSERT(FALSE);
/* not in use.. */
return;
}
LOCK_HTC_TX(target);
if (Active) {
if (!(pEndpoint->CreditDist.DistFlags & HTC_EP_ACTIVE)) {
/* mark active now */
pEndpoint->CreditDist.DistFlags |= HTC_EP_ACTIVE;
doDist = TRUE;
}
} else {
if (pEndpoint->CreditDist.DistFlags & HTC_EP_ACTIVE) {
/* mark inactive now */
pEndpoint->CreditDist.DistFlags &= ~HTC_EP_ACTIVE;
doDist = TRUE;
}
}
if (doDist) {
/* do distribution again based on activity change
* note, this is done with the lock held */
DO_DISTRIBUTION(target,
HTC_CREDIT_DIST_ACTIVITY_CHANGE,
"Activity Change",
target->EpCreditDistributionListHead->pNext);
}
UNLOCK_HTC_TX(target);
}