static int lan_reply()

in fusion/mptlan.c [126:293]

• 89 lines of code
• 12 McCabe index (conditional complexity)

static int  lan_reply (MPT_ADAPTER *ioc, MPT_FRAME_HDR *mf,
		       MPT_FRAME_HDR *reply);
static int  mpt_lan_open(struct net_device *dev);
static int  mpt_lan_reset(struct net_device *dev);
static int  mpt_lan_close(struct net_device *dev);
static void mpt_lan_post_receive_buckets(struct mpt_lan_priv *priv);
static void mpt_lan_wake_post_buckets_task(struct net_device *dev,
					   int priority);
static int  mpt_lan_receive_post_turbo(struct net_device *dev, u32 tmsg);
static int  mpt_lan_receive_post_reply(struct net_device *dev,
				       LANReceivePostReply_t *pRecvRep);
static int  mpt_lan_send_turbo(struct net_device *dev, u32 tmsg);
static int  mpt_lan_send_reply(struct net_device *dev,
			       LANSendReply_t *pSendRep);
static int  mpt_lan_ioc_reset(MPT_ADAPTER *ioc, int reset_phase);
static int  mpt_lan_event_process(MPT_ADAPTER *ioc, EventNotificationReply_t *pEvReply);
static unsigned short mpt_lan_type_trans(struct sk_buff *skb,
					 struct net_device *dev);

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *  Fusion MPT LAN private data
 */
static u8 LanCtx = MPT_MAX_PROTOCOL_DRIVERS;

static u32 max_buckets_out = 127;
static u32 tx_max_out_p = 127 - 16;

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/**
 *	lan_reply - Handle all data sent from the hardware.
 *	@ioc: Pointer to MPT_ADAPTER structure
 *	@mf: Pointer to original MPT request frame (NULL if TurboReply)
 *	@reply: Pointer to MPT reply frame
 *
 *	Returns 1 indicating original alloc'd request frame ptr
 *	should be freed, or 0 if it shouldn't.
 */
static int
lan_reply (MPT_ADAPTER *ioc, MPT_FRAME_HDR *mf, MPT_FRAME_HDR *reply)
{
	struct net_device *dev = ioc->netdev;
	int FreeReqFrame = 0;

	dioprintk((KERN_INFO MYNAM ": %s/%s: Got reply.\n",
		  IOC_AND_NETDEV_NAMES_s_s(dev)));

//	dioprintk((KERN_INFO MYNAM "@lan_reply: mf = %p, reply = %p\n",
//			mf, reply));

	if (mf == NULL) {
		u32 tmsg = CAST_PTR_TO_U32(reply);

		dioprintk((KERN_INFO MYNAM ": %s/%s: @lan_reply, tmsg %08x\n",
				IOC_AND_NETDEV_NAMES_s_s(dev),
				tmsg));

		switch (GET_LAN_FORM(tmsg)) {

		// NOTE!  (Optimization) First case here is now caught in
		//  mptbase.c::mpt_interrupt() routine and callcack here
		//  is now skipped for this case!
#if 0
		case LAN_REPLY_FORM_MESSAGE_CONTEXT:
//			dioprintk((KERN_INFO MYNAM "/lan_reply: "
//				  "MessageContext turbo reply received\n"));
			FreeReqFrame = 1;
			break;
#endif

		case LAN_REPLY_FORM_SEND_SINGLE:
//			dioprintk((MYNAM "/lan_reply: "
//				  "calling mpt_lan_send_reply (turbo)\n"));

			// Potential BUG here?
			//	FreeReqFrame = mpt_lan_send_turbo(dev, tmsg);
			//  If/when mpt_lan_send_turbo would return 1 here,
			//  calling routine (mptbase.c|mpt_interrupt)
			//  would Oops because mf has already been set
			//  to NULL.  So after return from this func,
			//  mpt_interrupt() will attempt to put (NULL) mf ptr
			//  item back onto its adapter FreeQ - Oops!:-(
			//  It's Ok, since mpt_lan_send_turbo() *currently*
			//  always returns 0, but..., just in case:

			(void) mpt_lan_send_turbo(dev, tmsg);
			FreeReqFrame = 0;

			break;

		case LAN_REPLY_FORM_RECEIVE_SINGLE:
//			dioprintk((KERN_INFO MYNAM "@lan_reply: "
//				  "rcv-Turbo = %08x\n", tmsg));
			mpt_lan_receive_post_turbo(dev, tmsg);
			break;

		default:
			printk (KERN_ERR MYNAM "/lan_reply: Got a turbo reply "
				"that I don't know what to do with\n");

			/* CHECKME!  Hmmm...  FreeReqFrame is 0 here; is that right? */

			break;
		}

		return FreeReqFrame;
	}

//	msg = (u32 *) reply;
//	dioprintk((KERN_INFO MYNAM "@lan_reply: msg = %08x %08x %08x %08x\n",
//		  le32_to_cpu(msg[0]), le32_to_cpu(msg[1]),
//		  le32_to_cpu(msg[2]), le32_to_cpu(msg[3])));
//	dioprintk((KERN_INFO MYNAM "@lan_reply: Function = %02xh\n",
//		  reply->u.hdr.Function));

	switch (reply->u.hdr.Function) {

	case MPI_FUNCTION_LAN_SEND:
	{
		LANSendReply_t *pSendRep;

		pSendRep = (LANSendReply_t *) reply;
		FreeReqFrame = mpt_lan_send_reply(dev, pSendRep);
		break;
	}

	case MPI_FUNCTION_LAN_RECEIVE:
	{
		LANReceivePostReply_t *pRecvRep;

		pRecvRep = (LANReceivePostReply_t *) reply;
		if (pRecvRep->NumberOfContexts) {
			mpt_lan_receive_post_reply(dev, pRecvRep);
			if (!(pRecvRep->MsgFlags & MPI_MSGFLAGS_CONTINUATION_REPLY))
				FreeReqFrame = 1;
		} else
			dioprintk((KERN_INFO MYNAM "@lan_reply: zero context "
				  "ReceivePostReply received.\n"));
		break;
	}

	case MPI_FUNCTION_LAN_RESET:
		/* Just a default reply. Might want to check it to
		 * make sure that everything went ok.
		 */
		FreeReqFrame = 1;
		break;

	case MPI_FUNCTION_EVENT_NOTIFICATION:
	case MPI_FUNCTION_EVENT_ACK:
		/*  _EVENT_NOTIFICATION should NOT come down this path any more.
		 *  Should be routed to mpt_lan_event_process(), but just in case...
		 */
		FreeReqFrame = 1;
		break;

	default:
		printk (KERN_ERR MYNAM "/lan_reply: Got a non-turbo "
			"reply that I don't know what to do with\n");

		/* CHECKME!  Hmmm...  FreeReqFrame is 0 here; is that right? */
		FreeReqFrame = 1;

		break;
	}

	return FreeReqFrame;
}