1. 根目录:
2. drivers
3. staging
4. bcm
5. InterfaceRx.c

#include "headers.h"

static void handle_control_packet(struct bcm_interface_adapter *interface,
				  struct bcm_mini_adapter *ad,
				  struct bcm_leader *leader,
				  struct sk_buff *skb,
				  struct urb *urb)
{
	BCM_DEBUG_PRINT(interface->psAdapter, DBG_TYPE_RX, RX_CTRL, DBG_LVL_ALL,
			"Received control pkt...");
	*(PUSHORT)skb->data = leader->Status;
	memcpy(skb->data+sizeof(USHORT), urb->transfer_buffer +
	       (sizeof(struct bcm_leader)), leader->PLength);
	skb->len = leader->PLength + sizeof(USHORT);

	spin_lock(&ad->control_queue_lock);
	ENQUEUEPACKET(ad->RxControlHead, ad->RxControlTail, skb);
	spin_unlock(&ad->control_queue_lock);

	atomic_inc(&ad->cntrlpktCnt);
	wake_up(&ad->process_rx_cntrlpkt);
}

static void format_eth_hdr_to_stack(struct bcm_interface_adapter *interface,
				    struct bcm_mini_adapter *ad,
				    struct bcm_leader *p_leader,
				    struct sk_buff *skb,
				    struct urb *urb,
				    UINT ui_index,
				    int queue_index,
				    bool b_header_supression_endabled)
{
	/*
	 * Data Packet, Format a proper Ethernet Header
	 * and give it to the stack
	 */
	BCM_DEBUG_PRINT(interface->psAdapter, DBG_TYPE_RX, RX_DATA,
			DBG_LVL_ALL, "Received Data pkt...");
	skb_reserve(skb, 2 + SKB_RESERVE_PHS_BYTES);
	memcpy(skb->data+ETH_HLEN, (PUCHAR)urb->transfer_buffer +
	       sizeof(struct bcm_leader), p_leader->PLength);
	skb->dev = ad->dev;

	/* currently skb->len has extra ETH_HLEN bytes in the beginning */
	skb_put(skb, p_leader->PLength + ETH_HLEN);
	ad->PackInfo[queue_index].uiTotalRxBytes += p_leader->PLength;
	ad->PackInfo[queue_index].uiThisPeriodRxBytes += p_leader->PLength;
	BCM_DEBUG_PRINT(interface->psAdapter, DBG_TYPE_RX, RX_DATA,
			DBG_LVL_ALL, "Received Data pkt of len :0x%X",
			p_leader->PLength);

	if (netif_running(ad->dev)) {
		/* Moving ahead by ETH_HLEN to the data ptr as received from FW */
		skb_pull(skb, ETH_HLEN);
		PHSReceive(ad, p_leader->Vcid, skb, &skb->len,
			   NULL, b_header_supression_endabled);

		if (!ad->PackInfo[queue_index].bEthCSSupport) {
			skb_push(skb, ETH_HLEN);

			memcpy(skb->data, skb->dev->dev_addr, 6);
			memcpy(skb->data+6, skb->dev->dev_addr, 6);
			(*(skb->data+11))++;
			*(skb->data+12) = 0x08;
			*(skb->data+13) = 0x00;
			p_leader->PLength += ETH_HLEN;
		}

		skb->protocol = eth_type_trans(skb, ad->dev);
		netif_rx(skb);
	} else {
		BCM_DEBUG_PRINT(interface->psAdapter, DBG_TYPE_RX,
				RX_DATA, DBG_LVL_ALL,
				"i/f not up hance freeing SKB...");
		dev_kfree_skb(skb);
	}

	++ad->dev->stats.rx_packets;
	ad->dev->stats.rx_bytes += p_leader->PLength;

	for (ui_index = 0; ui_index < MIBS_MAX_HIST_ENTRIES; ui_index++) {
		if ((p_leader->PLength <=
		    MIBS_PKTSIZEHIST_RANGE*(ui_index+1)) &&
			(p_leader->PLength > MIBS_PKTSIZEHIST_RANGE*(ui_index)))

			ad->aRxPktSizeHist[ui_index]++;
	}
}

static int SearchVcid(struct bcm_mini_adapter *Adapter, unsigned short usVcid)
{
	int iIndex = 0;

	for (iIndex = (NO_OF_QUEUES-1); iIndex >= 0; iIndex--)
		if (Adapter->PackInfo[iIndex].usVCID_Value == usVcid)
			return iIndex;
	return NO_OF_QUEUES+1;

}


static struct bcm_usb_rcb *
GetBulkInRcb(struct bcm_interface_adapter *psIntfAdapter)
{
	struct bcm_usb_rcb *pRcb = NULL;
	UINT index = 0;

	if ((atomic_read(&psIntfAdapter->uNumRcbUsed) < MAXIMUM_USB_RCB) &&
	    (psIntfAdapter->psAdapter->StopAllXaction == false)) {
		index = atomic_read(&psIntfAdapter->uCurrRcb);
		pRcb = &psIntfAdapter->asUsbRcb[index];
		pRcb->bUsed = TRUE;
		pRcb->psIntfAdapter = psIntfAdapter;
		BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_RX, RX_DPC,
				DBG_LVL_ALL, "Got Rx desc %d used %d", index,
				atomic_read(&psIntfAdapter->uNumRcbUsed));
		index = (index + 1) % MAXIMUM_USB_RCB;
		atomic_set(&psIntfAdapter->uCurrRcb, index);
		atomic_inc(&psIntfAdapter->uNumRcbUsed);
	}
	return pRcb;
}

/*this is receive call back - when pkt available for receive (BULK IN- end point)*/
static void read_bulk_callback(struct urb *urb)
{
	struct sk_buff *skb = NULL;
	bool bHeaderSupressionEnabled = false;
	int QueueIndex = NO_OF_QUEUES + 1;
	UINT uiIndex = 0;
	struct bcm_usb_rcb *pRcb = (struct bcm_usb_rcb *)urb->context;
	struct bcm_interface_adapter *psIntfAdapter = pRcb->psIntfAdapter;
	struct bcm_mini_adapter *Adapter = psIntfAdapter->psAdapter;
	struct bcm_leader *pLeader = urb->transfer_buffer;

	if (unlikely(netif_msg_rx_status(Adapter)))
		pr_info(PFX "%s: rx urb status %d length %d\n",
			Adapter->dev->name, urb->status, urb->actual_length);

	if ((Adapter->device_removed == TRUE) ||
	    (TRUE == Adapter->bEndPointHalted) ||
	    (0 == urb->actual_length)) {
		pRcb->bUsed = false;
		atomic_dec(&psIntfAdapter->uNumRcbUsed);
		return;
	}

	if (urb->status != STATUS_SUCCESS) {
		if (urb->status == -EPIPE) {
			Adapter->bEndPointHalted = TRUE;
			wake_up(&Adapter->tx_packet_wait_queue);
		} else {
			BCM_DEBUG_PRINT(Adapter, DBG_TYPE_RX, RX_DPC,
					DBG_LVL_ALL,
					"Rx URB has got cancelled. status :%d",
					urb->status);
		}
		pRcb->bUsed = false;
		atomic_dec(&psIntfAdapter->uNumRcbUsed);
		urb->status = STATUS_SUCCESS;
		return;
	}

	if (Adapter->bDoSuspend && (Adapter->bPreparingForLowPowerMode)) {
		BCM_DEBUG_PRINT(Adapter, DBG_TYPE_RX, RX_DPC, DBG_LVL_ALL,
				"device is going in low power mode while PMU option selected..hence rx packet should not be process");
		return;
	}

	BCM_DEBUG_PRINT(Adapter, DBG_TYPE_RX, RX_DPC, DBG_LVL_ALL,
			"Read back done len %d\n", pLeader->PLength);
	if (!pLeader->PLength) {
		BCM_DEBUG_PRINT(Adapter, DBG_TYPE_RX, RX_DPC, DBG_LVL_ALL,
				"Leader Length 0");
		atomic_dec(&psIntfAdapter->uNumRcbUsed);
		return;
	}
	BCM_DEBUG_PRINT(Adapter, DBG_TYPE_RX, RX_DPC, DBG_LVL_ALL,
			"Leader Status:0x%hX, Length:0x%hX, VCID:0x%hX",
			pLeader->Status, pLeader->PLength, pLeader->Vcid);
	if (MAX_CNTL_PKT_SIZE < pLeader->PLength) {
		if (netif_msg_rx_err(Adapter))
			pr_info(PFX "%s: corrupted leader length...%d\n",
				Adapter->dev->name, pLeader->PLength);
		++Adapter->dev->stats.rx_dropped;
		atomic_dec(&psIntfAdapter->uNumRcbUsed);
		return;
	}

	QueueIndex = SearchVcid(Adapter, pLeader->Vcid);
	if (QueueIndex < NO_OF_QUEUES) {
		bHeaderSupressionEnabled =
			Adapter->PackInfo[QueueIndex].bHeaderSuppressionEnabled;
		bHeaderSupressionEnabled =
			bHeaderSupressionEnabled & Adapter->bPHSEnabled;
	}

	skb = dev_alloc_skb(pLeader->PLength + SKB_RESERVE_PHS_BYTES +
			    SKB_RESERVE_ETHERNET_HEADER);
	if (!skb) {
		BCM_DEBUG_PRINT(Adapter, DBG_TYPE_PRINTK, 0, 0,
				"NO SKBUFF!!! Dropping the Packet");
		atomic_dec(&psIntfAdapter->uNumRcbUsed);
		return;
	}
	/* If it is a control Packet, then call handle_bcm_packet ()*/
	if ((ntohs(pLeader->Vcid) == VCID_CONTROL_PACKET) ||
	    (!(pLeader->Status >= 0x20  &&  pLeader->Status <= 0x3F))) {
		handle_control_packet(psIntfAdapter, Adapter, pLeader, skb,
				      urb);
	} else {
		format_eth_hdr_to_stack(psIntfAdapter, Adapter, pLeader, skb,
					urb, uiIndex, QueueIndex,
					bHeaderSupressionEnabled);
	}
	Adapter->PrevNumRecvDescs++;
	pRcb->bUsed = false;
	atomic_dec(&psIntfAdapter->uNumRcbUsed);
}

static int ReceiveRcb(struct bcm_interface_adapter *psIntfAdapter,
		      struct bcm_usb_rcb *pRcb)
{
	struct urb *urb = pRcb->urb;
	int retval = 0;

	usb_fill_bulk_urb(urb, psIntfAdapter->udev,
			  usb_rcvbulkpipe(psIntfAdapter->udev,
					  psIntfAdapter->sBulkIn.bulk_in_endpointAddr),
			  urb->transfer_buffer,
			  BCM_USB_MAX_READ_LENGTH,
			  read_bulk_callback, pRcb);

	if (false == psIntfAdapter->psAdapter->device_removed &&
	    false == psIntfAdapter->psAdapter->bEndPointHalted &&
	    false == psIntfAdapter->bSuspended &&
	    false == psIntfAdapter->bPreparingForBusSuspend) {
		retval = usb_submit_urb(urb, GFP_ATOMIC);
		if (retval) {
			BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_RX,
					RX_DPC, DBG_LVL_ALL,
					"failed submitting read urb, error %d",
					retval);
			/* if this return value is because of pipe halt. need to clear this. */
			if (retval == -EPIPE) {
				psIntfAdapter->psAdapter->bEndPointHalted = TRUE;
				wake_up(&psIntfAdapter->psAdapter->tx_packet_wait_queue);
			}

		}
	}
	return retval;
}

/*
Function:				InterfaceRx

Description:			This is the hardware specific Function for Receiving
						data packet/control packets from the device.

Input parameters:		IN struct bcm_mini_adapter *Adapter   - Miniport Adapter Context



Return:				TRUE  - If Rx was successful.
					Other - If an error occurred.
*/

bool InterfaceRx(struct bcm_interface_adapter *psIntfAdapter)
{
	USHORT RxDescCount = NUM_RX_DESC -
		atomic_read(&psIntfAdapter->uNumRcbUsed);

	struct bcm_usb_rcb *pRcb = NULL;

	while (RxDescCount) {
		pRcb = GetBulkInRcb(psIntfAdapter);
		if (pRcb == NULL) {
			BCM_DEBUG_PRINT(psIntfAdapter->psAdapter,
					DBG_TYPE_PRINTK, 0, 0,
					"Unable to get Rcb pointer");
			return false;
		}
		ReceiveRcb(psIntfAdapter, pRcb);
		RxDescCount--;
	}
	return TRUE;
}