isp_target.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

{
	int lun;

	if (FCPARAM(isp)->isp_fwattr & ISP_FW_ATTR_SCCLUN) {
		lun = aep->at_scclun;
	} else {
		lun = aep->at_lun;
	}

	/*
	 * The firmware status (except for the QLTM_SVALID bit) indicates
	 * why this ATIO was sent to us.
	 *
	 * If QLTM_SVALID is set, the firware has recommended Sense Data.
	 *
	 * If the DISCONNECTS DISABLED bit is set in the flags field,
	 * we're still connected on the SCSI bus - i.e. the initiator
	 * did not set DiscPriv in the identify message. We don't care
	 * about this so it's ignored.
	 */

	switch(aep->at_status & ~QLTM_SVALID) {
	case AT_PATH_INVALID:
		/*
		 * ATIO rejected by the firmware due to disabled lun.
		 */
		isp_prt(isp, ISP_LOGERR,
		    "rejected ATIO2 for disabled lun %d", lun);
		break;
	case AT_NOCAP:
		/*
		 * Requested Capability not available
		 * We sent an ATIO that overflowed the firmware's
		 * command resource count.
		 */
		isp_prt(isp, ISP_LOGERR,
		    "rejected ATIO2 for lun %d- command count overflow", lun);
		break;

	case AT_BDR_MSG:
		/*
		 * If we send an ATIO to the firmware to increment
		 * its command resource count, and the firmware is
		 * recovering from a Bus Device Reset, it returns
		 * the ATIO with this status. We set the command
		 * resource count in the Enable Lun entry and no
		 * not increment it. Therefore we should never get
		 * this status here.
		 */
		isp_prt(isp, ISP_LOGERR, atiocope, lun, 0);
		break;

	case AT_CDB:		/* Got a CDB */
		/*
		 * Punt to platform specific layer.
		 */
		(void) isp_async(isp, ISPASYNC_TARGET_ACTION, aep);
		break;

	case AT_RESET:
		/*
		 * A bus reset came along an blew away this command. Why
		 * they do this in addition the async event code stuff,
		 * I dunno.
		 *
		 * Ignore it because the async event will clear things
		 * up for us.
		 */
		isp_prt(isp, ISP_LOGERR, atior, lun, aep->at_iid, 0);
		break;


	default:
		isp_prt(isp, ISP_LOGERR,
		    "Unknown ATIO2 status 0x%x from initiator %d for lun %d",
		    aep->at_status, aep->at_iid, lun);
		(void) isp_target_put_atio(isp, aep);
		break;
	}
}

static void
isp_handle_ctio(struct ispsoftc *isp, ct_entry_t *ct)
{
	void *xs;
	int pl = ISP_LOGTDEBUG2;
	char *fmsg = NULL;

	if (ct->ct_syshandle) {
		xs = isp_find_xs(isp, ct->ct_syshandle);
		if (xs == NULL)
			pl = ISP_LOGALL;
	} else {
		xs = NULL;
	}

	switch(ct->ct_status & ~QLTM_SVALID) {
	case CT_OK:
		/*
		 * There are generally 3 possibilities as to why we'd get
		 * this condition:
		 * 	We disconnected after receiving a CDB.
		 * 	We sent or received data.
		 * 	We sent status & command complete.
		 */

		if (ct->ct_flags & CT_SENDSTATUS) {
			break;
		} else if ((ct->ct_flags & CT_DATAMASK) == CT_NO_DATA) {
			/*
			 * Nothing to do in this case.
			 */
			isp_prt(isp, pl, "CTIO- iid %d disconnected OK",
			    ct->ct_iid);
			return;
		}
		break;

	case CT_BDR_MSG:
		/*
		 * Bus Device Reset message received or the SCSI Bus has
		 * been Reset; the firmware has gone to Bus Free.
		 *
		 * The firmware generates an async mailbox interupt to
		 * notify us of this and returns outstanding CTIOs with this
		 * status. These CTIOs are handled in that same way as
		 * CT_ABORTED ones, so just fall through here.
		 */
		fmsg = "Bus Device Reset";
		/*FALLTHROUGH*/
	case CT_RESET:
		if (fmsg == NULL)
			fmsg = "Bus Reset";
		/*FALLTHROUGH*/
	case CT_ABORTED:
		/*
		 * When an Abort message is received the firmware goes to
		 * Bus Free and returns all outstanding CTIOs with the status
		 * set, then sends us an Immediate Notify entry.
		 */
		if (fmsg == NULL)
			fmsg = "ABORT TAG message sent by Initiator";

		isp_prt(isp, ISP_LOGWARN, "CTIO destroyed by %s", fmsg);
		break;

	case CT_INVAL:
		/*
		 * CTIO rejected by the firmware due to disabled lun.
		 * "Cannot Happen".
		 */
		isp_prt(isp, ISP_LOGERR,
		    "Firmware rejected CTIO for disabled lun %d",
		    ct->ct_lun);
		break;

	case CT_NOPATH:
		/*
		 * CTIO rejected by the firmware due "no path for the
		 * nondisconnecting nexus specified". This means that
		 * we tried to access the bus while a non-disconnecting
		 * command is in process.
		 */
		isp_prt(isp, ISP_LOGERR,
		    "Firmware rejected CTIO for bad nexus %d/%d/%d",
		    ct->ct_iid, ct->ct_tgt, ct->ct_lun);
		break;

	case CT_RSELTMO:
		fmsg = "Reselection";
		/*FALLTHROUGH*/
	case CT_TIMEOUT:
		if (fmsg == NULL)
			fmsg = "Command";
		isp_prt(isp, ISP_LOGERR, "Firmware timed out on %s", fmsg);
		break;

	case	CT_PANIC:
		if (fmsg == NULL)
			fmsg = "Unrecoverable Error";
		/*FALLTHROUGH*/
	case CT_ERR:
		if (fmsg == NULL)
			fmsg = "Completed with Error";
		/*FALLTHROUGH*/
	case CT_PHASE_ERROR:
		if (fmsg == NULL)
			fmsg = "Phase Sequence Error";
		/*FALLTHROUGH*/
	case CT_TERMINATED:
		if (fmsg == NULL)
			fmsg = "terminated by TERMINATE TRANSFER";
		/*FALLTHROUGH*/
	case CT_NOACK:
		if (fmsg == NULL)
			fmsg = "unacknowledged Immediate Notify pending";
		isp_prt(isp, ISP_LOGERR, "CTIO returned by f/w- %s", fmsg);
		break;
	default:
		isp_prt(isp, ISP_LOGERR, "Unknown CTIO status 0x%x",
		    ct->ct_status & ~QLTM_SVALID);
		break;
	}

	if (xs == NULL) {
		/*
		 * There may be more than one CTIO for a data transfer,
		 * or this may be a status CTIO we're not monitoring.
		 *
		 * The assumption is that they'll all be returned in the
		 * order we got them.
		 */
		if (ct->ct_syshandle == 0) {
			if ((ct->ct_flags & CT_SENDSTATUS) == 0) {
				isp_prt(isp, pl,
				    "intermediate CTIO completed ok");
			} else {
				isp_prt(isp, pl,
				    "unmonitored CTIO completed ok");
			}
		} else {
			isp_prt(isp, pl,
			    "NO xs for CTIO (handle 0x%x) status 0x%x",
			    ct->ct_syshandle, ct->ct_status & ~QLTM_SVALID);
		}
	} else {
		/*
		 * Final CTIO completed. Release DMA resources and
		 * notify platform dependent layers.
		 */
		if ((ct->ct_flags & CT_DATAMASK) != CT_NO_DATA) {
			ISP_DMAFREE(isp, xs, ct->ct_syshandle);
		}
		isp_prt(isp, pl, "final CTIO complete");
		/*
		 * The platform layer will destroy the handle if appropriate.
		 */
		(void) isp_async(isp, ISPASYNC_TARGET_ACTION, ct);
	}
}

static void
isp_handle_ctio2(struct ispsoftc *isp, ct2_entry_t *ct)
{
	XS_T *xs;
	int pl = ISP_LOGTDEBUG2;
	char *fmsg = NULL;

	if (ct->ct_syshandle) {
		xs = isp_find_xs(isp, ct->ct_syshandle);
		if (xs == NULL)
			pl = ISP_LOGALL;
	} else {
		xs = NULL;
	}

	switch(ct->ct_status & ~QLTM_SVALID) {
	case CT_BUS_ERROR:
		isp_prt(isp, ISP_LOGERR, "PCI DMA Bus Error");
		/* FALL Through */
	case CT_DATA_OVER:
	case CT_DATA_UNDER:
	case CT_OK:
		/*
		 * There are generally 2 possibilities as to why we'd get
		 * this condition:
		 * 	We sent or received data.
		 * 	We sent status & command complete.
		 */

		break;

	case CT_BDR_MSG:
		/*
		 * Target Reset function received.
		 *
		 * The firmware generates an async mailbox interupt to
		 * notify us of this and returns outstanding CTIOs with this
		 * status. These CTIOs are handled in that same way as
		 * CT_ABORTED ones, so just fall through here.
		 */
		fmsg = "TARGET RESET Task Management Function Received";
		/*FALLTHROUGH*/
	case CT_RESET:
		if (fmsg == NULL)
			fmsg = "LIP Reset";
		/*FALLTHROUGH*/
	case CT_ABORTED:
		/*
		 * When an Abort message is received the firmware goes to
		 * Bus Free and returns all outstanding CTIOs with the status
		 * set, then sends us an Immediate Notify entry.
		 */
		if (fmsg == NULL)
			fmsg = "ABORT Task Management Function Received";

		isp_prt(isp, ISP_LOGERR, "CTIO2 destroyed by %s", fmsg);
		break;

	case CT_INVAL:
		/*
		 * CTIO rejected by the firmware - invalid data direction.
		 */
		isp_prt(isp, ISP_LOGERR, "CTIO2 had wrong data directiond");
		break;

	case CT_RSELTMO:
		fmsg = "failure to reconnect to initiator";
		/*FALLTHROUGH*/
	case CT_TIMEOUT:
		if (fmsg == NULL)
			fmsg = "command";
		isp_prt(isp, ISP_LOGERR, "Firmware timed out on %s", fmsg);
		break;

	case CT_ERR:
		fmsg = "Completed with Error";
		/*FALLTHROUGH*/
	case CT_LOGOUT:
		if (fmsg == NULL)
			fmsg = "Port Logout";
		/*FALLTHROUGH*/
	case CT_PORTNOTAVAIL:
		if (fmsg == NULL)
			fmsg = "Port not available";
	case CT_PORTCHANGED:
		if (fmsg == NULL)
			fmsg = "Port Changed";
	case CT_NOACK:
		if (fmsg == NULL)
			fmsg = "unacknowledged Immediate Notify pending";
		isp_prt(isp, ISP_LOGERR, "CTIO returned by f/w- %s", fmsg);
		break;

	case CT_INVRXID:
		/*
		 * CTIO rejected by the firmware because an invalid RX_ID.
		 * Just print a message.
		 */
		isp_prt(isp, ISP_LOGERR,
		    "CTIO2 completed with Invalid RX_ID 0x%x", ct->ct_rxid);
		break;

	default:
		isp_prt(isp, ISP_LOGERR, "Unknown CTIO2 status 0x%x",
		    ct->ct_status & ~QLTM_SVALID);
		break;
	}

	if (xs == NULL) {
		/*
		 * There may be more than one CTIO for a data transfer,
		 * or this may be a status CTIO we're not monitoring.
		 *
		 * The assumption is that they'll all be returned in the
		 * order we got them.
		 */
		if (ct->ct_syshandle == 0) {
			if ((ct->ct_flags & CT_SENDSTATUS) == 0) {
				isp_prt(isp, pl,
				    "intermediate CTIO completed ok");
			} else {
				isp_prt(isp, pl,
				    "unmonitored CTIO completed ok");
			}
		} else {
			isp_prt(isp, pl,
			    "NO xs for CTIO (handle 0x%x) status 0x%x",
			    ct->ct_syshandle, ct->ct_status & ~QLTM_SVALID);
		}
	} else {
		if ((ct->ct_flags & CT2_DATAMASK) != CT2_NO_DATA) {
			ISP_DMAFREE(isp, xs, ct->ct_syshandle);
		}
		if (ct->ct_flags & CT_SENDSTATUS) {
			/*
			 * Sent status and command complete.
			 *
			 * We're now really done with this command, so we
			 * punt to the platform dependent layers because
			 * only there can we do the appropriate command
			 * complete thread synchronization.
			 */
			isp_prt(isp, pl, "status CTIO complete");
		} else {
			/*
			 * Final CTIO completed. Release DMA resources and
			 * notify platform dependent layers.
			 */
			isp_prt(isp, pl, "data CTIO complete");
		}
		(void) isp_async(isp, ISPASYNC_TARGET_ACTION, ct);
		/*
		 * The platform layer will destroy the handle if appropriate.
		 */
	}
}
#endif