/**
* \brief Send a packet with GMAC. If the packet size is larger than transfer buffer size
* error returned. If packet transfer status is monitored, specify callback for each packet.
* \param pGmacd Pointer to GMAC Driver instance.
* \param buffer The buffer to be send
* \param size The size of buffer to be send
* \param fGMAC_TxCallback Threshold Wakeup callback
* \param fWakeUpCb TX Wakeup
* \return OK, Busy or invalid packet
*/
uint8_t GMACD_Send(sGmacd *pGmacd,
void *pBuffer,
uint32_t size,
fGmacdTransferCallback fTxCb )
{
Gmac *pHw = pGmacd->pHw;
sGmacTxDescriptor *pTxTd;
volatile fGmacdTransferCallback *pfTxCb;
TRACE_DEBUG("GMAC_Send\n\r");
/* Check parameter */
if (size > GMAC_TX_UNITSIZE) {
TRACE_ERROR("GMAC driver does not split send packets.");
return GMACD_PARAM;
}
/* Pointers to the current TxTd */
pTxTd = &pGmacd->pTxD[pGmacd->wTxHead];
/* If no free TxTd, buffer can't be sent */
if( GCIRC_SPACE(pGmacd->wTxHead, pGmacd->wTxTail, pGmacd->wTxListSize) == 0)
return GMACD_TX_BUSY;
/* Pointers to the current Tx Callback */
pfTxCb = &pGmacd->fTxCbList[pGmacd->wTxHead];
/* Sanity check */
/* Setup/Copy data to transmition buffer */
if (pBuffer && size) {
// Driver manage the ring buffer
memcpy((void *)pTxTd->addr, pBuffer, size);
}
/* Tx Callback */
*pfTxCb = fTxCb;
/* Update TD status. The buffer size defined is length of ethernet frame
so it's always the last buffer of the frame. */
if (pGmacd->wTxHead == pGmacd->wTxListSize-1) {
pTxTd->status.val =
(size & GMAC_LENGTH_FRAME) | GMAC_TX_LAST_BUFFER_BIT | GMAC_TX_WRAP_BIT;
}
else {
pTxTd->status.val = (size & GMAC_LENGTH_FRAME) | GMAC_TX_LAST_BUFFER_BIT;
}
GCIRC_INC(pGmacd->wTxHead, pGmacd->wTxListSize);
//CP15_flush_dcache_for_dma ((uint32_t)(pTxTd), ((uint32_t)(pTxTd) + sizeof(pTxTd)));
/* Tx packets count */
/* Now start to transmit if it is not already done */
GMAC_TransmissionStart(pHw);
return GMACD_OK;
}
/**
* \brief Send a frame splitted into buffers. If the frame size is larger than transfer buffer size
* error returned. If frame transfer status is monitored, specify callback for each frame.
* \param pGmacd Pointer to GMAC Driver instance.
* \param sgl Pointer to a scatter-gather list describing the buffers of the ethernet frame.
*/
uint8_t GMACD_SendSG(sGmacd *pGmacd,
const sGmacSGList *sgl,
fGmacdTransferCallback fTxCb,
gmacQueList_t queIdx)
{
Gmac *pHw = pGmacd->pHw;
sGmacTxDescriptor *pTd = pGmacd->queueList[queIdx].pTxD;
sGmacTxDescriptor *pTxTd;
uint16_t wTxPos, wTxHead;
int i;
TRACE_DEBUG("%s\n\r", __FUNCTION__);
/* Check parameter */
if (!sgl->len) {
TRACE_ERROR("%s:: ethernet frame is empty.\r\n", __FUNCTION__);
return GMACD_PARAM;
}
if (sgl->len >= pGmacd->queueList[queIdx].wTxListSize) {
TRACE_ERROR("%s: ethernet frame has too many buffers.\r\n", __FUNCTION__);
return GMACD_PARAM;
}
/* Check available space */
if (GCIRC_SPACE(pGmacd->queueList[queIdx].wTxHead, pGmacd->queueList[queIdx].wTxTail, pGmacd->queueList[queIdx].wTxListSize) < (int)sgl->len)
return GMACD_TX_BUSY;
/* Tag end of TX queue */
wTxHead = fixed_mod(pGmacd->queueList[queIdx].wTxHead + sgl->len, pGmacd->queueList[queIdx].wTxListSize);
wTxPos = wTxHead;
pGmacd->queueList[queIdx].fTxCbList[wTxPos] = NULL;
pTxTd = &pTd[wTxPos];
pTxTd->status.val = GMAC_TX_USED_BIT;
/* Update buffer descriptors in reverse order to avoid a race
* condition with hardware.
*/
for (i = (int)(sgl->len-1); i >= 0; --i) {
const sGmacSG *sg = &sgl->sg[i];
uint32_t status;
if (sg->size > GMAC_TX_UNITSIZE) {
TRACE_ERROR("%s: buffer size is too big.\r\n", __FUNCTION__);
return GMACD_PARAM;
}
if (wTxPos == 0)
wTxPos = pGmacd->queueList[queIdx].wTxListSize-1;
else
wTxPos--;
/* Reset TX callback */
pGmacd->queueList[queIdx].fTxCbList[wTxPos] = NULL;
pTxTd = &pTd[wTxPos];
#ifdef GMAC_ZERO_COPY
/** Update buffer descriptor address word:
* MUST be done before status word to avoid a race condition.
*/
pTxTd->addr = (uint32_t)sg->pBuffer;
#else
/* Copy data into transmittion buffer */
if (sg->pBuffer && sg->size)
memcpy((void *)pTxTd->addr, sg->pBuffer, sg->size);
#endif
/* Compute buffer descriptor status word */
status = sg->size & GMAC_LENGTH_FRAME;
if (i == (int)(sgl->len-1)) {
status |= GMAC_TX_LAST_BUFFER_BIT;
pGmacd->queueList[queIdx].fTxCbList[wTxPos] = fTxCb;
}
if (wTxPos == pGmacd->queueList[queIdx].wTxListSize-1)
status |= GMAC_TX_WRAP_BIT;
/* Update buffer descriptor status word: clear USED bit */
pTxTd->status.val = status;
/* Make newly initialized descriptor visible to hardware */
memory_barrier();
}
/* Update TX ring buffer pointers */
pGmacd->queueList[queIdx].wTxHead = wTxHead;
memory_barrier();
/* Now start to transmit if it is not already done */
GMAC_TransmissionStart(pHw);
return GMACD_OK;
}