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

		}
		atun._atio2.at_status = CT_OK;
	} else {
		at_entry_t *aep = arg;
		atun._atio.at_header.rqs_entry_type = RQSTYPE_ATIO;
		atun._atio.at_header.rqs_entry_count = 1;
		atun._atio.at_handle = aep->at_handle;
		atun._atio.at_iid = aep->at_iid;
		atun._atio.at_tgt = aep->at_tgt;
		atun._atio.at_lun = aep->at_lun;
		atun._atio.at_tag_type = aep->at_tag_type;
		atun._atio.at_tag_val = aep->at_tag_val;
		atun._atio.at_status = (aep->at_flags & AT_TQAE);
		atun._atio.at_status |= CT_OK;
	}
	return (isp_target_put_entry(isp, &atun));
}

/*
 * Command completion- both for handling cases of no resources or
 * no blackhole driver, or other cases where we have to, inline,
 * finish the command sanely, or for normal command completion.
 *
 * The 'completion' code value has the scsi status byte in the low 8 bits.
 * If status is a CHECK CONDITION and bit 8 is nonzero, then bits 12..15 have
 * the sense key and  bits 16..23 have the ASCQ and bits 24..31 have the ASC
 * values.
 *
 * NB: the key, asc, ascq, cannot be used for parallel SCSI as it doesn't
 * NB: inline SCSI sense reporting. As such, we lose this information. XXX.
 *
 * For both parallel && fibre channel, we use the feature that does
 * an automatic resource autoreplenish so we don't have then later do
 * put of an atio to replenish the f/w's resource count.
 */

int
isp_endcmd(struct ispsoftc *isp, void *arg, u_int32_t code, u_int16_t hdl)
{
	int sts;
	union {
		ct_entry_t _ctio;
		ct2_entry_t _ctio2;
	} un;

	MEMZERO(&un, sizeof un);
	sts = code & 0xff;

	if (IS_FC(isp)) {
		at2_entry_t *aep = arg;
		ct2_entry_t *cto = &un._ctio2;

		cto->ct_header.rqs_entry_type = RQSTYPE_CTIO2;
		cto->ct_header.rqs_entry_count = 1;
		cto->ct_iid = aep->at_iid;
		if ((FCPARAM(isp)->isp_fwattr & ISP_FW_ATTR_SCCLUN) == 0) {
			cto->ct_lun = aep->at_lun;
		}
		cto->ct_rxid = aep->at_rxid;
		cto->rsp.m1.ct_scsi_status = sts & 0xff;
		cto->ct_flags = CT2_SENDSTATUS | CT2_NO_DATA | CT2_FLAG_MODE1;
		if (hdl == 0) {
			cto->ct_flags |= CT2_CCINCR;
		}
		if (aep->at_datalen) {
			cto->ct_resid = aep->at_datalen;
			cto->rsp.m1.ct_scsi_status |= CT2_DATA_UNDER;
		}
		if ((sts & 0xff) == SCSI_CHECK && (sts & ECMD_SVALID)) {
			cto->rsp.m1.ct_resp[0] = 0xf0;
			cto->rsp.m1.ct_resp[2] = (code >> 12) & 0xf;
			cto->rsp.m1.ct_resp[7] = 8;
			cto->rsp.m1.ct_resp[12] = (code >> 24) & 0xff;
			cto->rsp.m1.ct_resp[13] = (code >> 16) & 0xff;
			cto->rsp.m1.ct_senselen = 16;
			cto->rsp.m1.ct_scsi_status |= CT2_SNSLEN_VALID;
		}
		cto->ct_syshandle = hdl;
	} else {
		at_entry_t *aep = arg;
		ct_entry_t *cto = &un._ctio;

		cto->ct_header.rqs_entry_type = RQSTYPE_CTIO;
		cto->ct_header.rqs_entry_count = 1;
		cto->ct_fwhandle = aep->at_handle;
		cto->ct_iid = aep->at_iid;
		cto->ct_tgt = aep->at_tgt;
		cto->ct_lun = aep->at_lun;
		cto->ct_tag_type = aep->at_tag_type;
		cto->ct_tag_val = aep->at_tag_val;
		if (aep->at_flags & AT_TQAE) {
			cto->ct_flags |= CT_TQAE;
		}
		cto->ct_flags = CT_SENDSTATUS | CT_NO_DATA;
		if (hdl == 0) {
			cto->ct_flags |= CT_CCINCR;
		}
		cto->ct_scsi_status = sts;
		cto->ct_syshandle = hdl;
	}
	return (isp_target_put_entry(isp, &un));
}

void
isp_target_async(struct ispsoftc *isp, int bus, int event)
{
	tmd_event_t evt;
	tmd_msg_t msg;

	switch (event) {
	/*
	 * These three we handle here to propagate an effective bus reset
	 * upstream, but these do not require any immediate notify actions
	 * so we return when done.
	 */
	case ASYNC_LIP_F8:
	case ASYNC_LIP_OCCURRED:
	case ASYNC_LOOP_UP:
	case ASYNC_LOOP_DOWN:
	case ASYNC_LOOP_RESET:
	case ASYNC_PTPMODE:
		/*
		 * These don't require any immediate notify actions. We used
		 * treat them like SCSI Bus Resets, but that was just plain
		 * wrong. Let the normal CTIO completion report what occurred.
		 */
                return;

	case ASYNC_BUS_RESET:
	case ASYNC_TIMEOUT_RESET:
		if (IS_FC(isp)) {
			return;	/* we'll be getting an inotify instead */
		}
		evt.ev_bus = bus;
		evt.ev_event = event;
		(void) isp_async(isp, ISPASYNC_TARGET_EVENT, &evt);
		break;
	case ASYNC_DEVICE_RESET:
		/*
		 * Bus Device Reset resets a specific target, so
		 * we pass this as a synthesized message.
		 */
		MEMZERO(&msg, sizeof msg);
		if (IS_FC(isp)) {
			msg.nt_iid = FCPARAM(isp)->isp_loopid;
		} else {
			msg.nt_iid = SDPARAM(isp)->isp_initiator_id;
		}
		msg.nt_bus = bus;
		msg.nt_msg[0] = MSG_BUS_DEV_RESET;
		(void) isp_async(isp, ISPASYNC_TARGET_MESSAGE, &msg);
		break;
	default:
		isp_prt(isp, ISP_LOGERR,
		    "isp_target_async: unknown event 0x%x", event);
		break;
	}
	if (isp->isp_state == ISP_RUNSTATE)
		isp_notify_ack(isp, NULL);
}


/*
 * Process a received message.
 * The ISP firmware can handle most messages, there are only
 * a few that we need to deal with:
 * - abort: clean up the current command
 * - abort tag and clear queue
 */

static void
isp_got_msg(struct ispsoftc *isp, int bus, in_entry_t *inp)
{
	u_int8_t status = inp->in_status & ~QLTM_SVALID;

	if (status == IN_IDE_RECEIVED || status == IN_MSG_RECEIVED) {
		tmd_msg_t msg;

		MEMZERO(&msg, sizeof (msg));
		msg.nt_bus = bus;
		msg.nt_iid = inp->in_iid;
		msg.nt_tgt = inp->in_tgt;
		msg.nt_lun = inp->in_lun;
		msg.nt_tagtype = inp->in_tag_type;
		msg.nt_tagval = inp->in_tag_val;
		MEMCPY(msg.nt_msg, inp->in_msg, IN_MSGLEN);
		(void) isp_async(isp, ISPASYNC_TARGET_MESSAGE, &msg);
	} else {
		isp_prt(isp, ISP_LOGERR,
		    "unknown immediate notify status 0x%x", inp->in_status);
	}
}

/*
 * Synthesize a message from the task management flags in a FCP_CMND_IU.
 */
static void
isp_got_msg_fc(struct ispsoftc *isp, int bus, in_fcentry_t *inp)
{
	int lun;
	static const char f1[] = "%s from iid %d lun %d seq 0x%x";
	static const char f2[] = 
	    "unknown %s 0x%x lun %d iid %d task flags 0x%x seq 0x%x\n";

	if (FCPARAM(isp)->isp_fwattr & ISP_FW_ATTR_SCCLUN) {
		lun = inp->in_scclun;
	} else {
		lun = inp->in_lun;
	}

	if (inp->in_status != IN_MSG_RECEIVED) {
		isp_prt(isp, ISP_LOGINFO, f2, "immediate notify status",
		    inp->in_status, lun, inp->in_iid,
		    inp->in_task_flags,  inp->in_seqid);
	} else {
		tmd_msg_t msg;

		MEMZERO(&msg, sizeof (msg));
		msg.nt_bus = bus;
		msg.nt_iid = inp->in_iid;
		msg.nt_tagval = inp->in_seqid;
		msg.nt_lun = lun;

		if (inp->in_task_flags & TASK_FLAGS_ABORT_TASK) {
			isp_prt(isp, ISP_LOGINFO, f1, "ABORT TASK",
			    inp->in_iid, msg.nt_lun, inp->in_seqid);
			msg.nt_msg[0] = MSG_ABORT_TAG;
		} else if (inp->in_task_flags & TASK_FLAGS_CLEAR_TASK_SET) {
			isp_prt(isp, ISP_LOGINFO, f1, "CLEAR TASK SET",
			    inp->in_iid, msg.nt_lun, inp->in_seqid);
			msg.nt_msg[0] = MSG_CLEAR_QUEUE;
		} else if (inp->in_task_flags & TASK_FLAGS_TARGET_RESET) {
			isp_prt(isp, ISP_LOGINFO, f1, "TARGET RESET",
			    inp->in_iid, msg.nt_lun, inp->in_seqid);
			msg.nt_msg[0] = MSG_BUS_DEV_RESET;
		} else if (inp->in_task_flags & TASK_FLAGS_CLEAR_ACA) {
			isp_prt(isp, ISP_LOGINFO, f1, "CLEAR ACA",
			    inp->in_iid, msg.nt_lun, inp->in_seqid);
			/* ???? */
			msg.nt_msg[0] = MSG_REL_RECOVERY;
		} else if (inp->in_task_flags & TASK_FLAGS_TERMINATE_TASK) {
			isp_prt(isp, ISP_LOGINFO, f1, "TERMINATE TASK",
			    inp->in_iid, msg.nt_lun, inp->in_seqid);
			msg.nt_msg[0] = MSG_TERM_IO_PROC;
		} else {
			isp_prt(isp, ISP_LOGWARN, f2, "task flag",
			    inp->in_status, msg.nt_lun, inp->in_iid,
			    inp->in_task_flags,  inp->in_seqid);
		}
		if (msg.nt_msg[0]) {
			(void) isp_async(isp, ISPASYNC_TARGET_MESSAGE, &msg);
		}
	}
}

static void
isp_notify_ack(struct ispsoftc *isp, void *arg)
{
	char storage[QENTRY_LEN];
	u_int16_t nxti, optr;
	void *outp;

	if (isp_getrqentry(isp, &nxti, &optr, &outp)) {
		isp_prt(isp, ISP_LOGWARN,
		    "Request Queue Overflow For isp_notify_ack");
		return;
	}

	MEMZERO(storage, QENTRY_LEN);

	if (IS_FC(isp)) {
		na_fcentry_t *na = (na_fcentry_t *) storage;
		if (arg) {
			in_fcentry_t *inp = arg;
			MEMCPY(storage, arg, sizeof (isphdr_t));
			na->na_iid = inp->in_iid;
			if (FCPARAM(isp)->isp_fwattr & ISP_FW_ATTR_SCCLUN) {
				na->na_lun = inp->in_scclun;
			} else {
				na->na_lun = inp->in_lun;
			}
			na->na_task_flags = inp->in_task_flags;
			na->na_seqid = inp->in_seqid;
			na->na_flags = NAFC_RCOUNT;
			na->na_status = inp->in_status;
			if (inp->in_status == IN_RESET) {
				na->na_flags |= NAFC_RST_CLRD;
			}
		} else {
			na->na_flags = NAFC_RST_CLRD;
		}
		na->na_header.rqs_entry_type = RQSTYPE_NOTIFY_ACK;
		na->na_header.rqs_entry_count = 1;
		isp_put_notify_ack_fc(isp, na, (na_fcentry_t *)outp);
	} else {
		na_entry_t *na = (na_entry_t *) storage;
		if (arg) {
			in_entry_t *inp = arg;
			MEMCPY(storage, arg, sizeof (isphdr_t));
			na->na_iid = inp->in_iid;
			na->na_lun = inp->in_lun;
			na->na_tgt = inp->in_tgt;
			na->na_seqid = inp->in_seqid;
			if (inp->in_status == IN_RESET) {
				na->na_event = NA_RST_CLRD;
			}
		} else {
			na->na_event = NA_RST_CLRD;
		}
		na->na_header.rqs_entry_type = RQSTYPE_NOTIFY_ACK;
		na->na_header.rqs_entry_count = 1;
		isp_put_notify_ack(isp, na, (na_entry_t *)outp);
	}
	ISP_TDQE(isp, "isp_notify_ack", (int) optr, storage);
	ISP_ADD_REQUEST(isp, nxti);
}

static void
isp_handle_atio(struct ispsoftc *isp, at_entry_t *aep)
{
	int lun;
	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 ATIO 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 ATIO for lun %d because of 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 do
		 * not increment it. Therefore we should never get
		 * this status here.
		 */
		isp_prt(isp, ISP_LOGERR, atiocope, lun,
		    GET_BUS_VAL(aep->at_iid));
		break;

	case AT_CDB:		/* Got a CDB */
	case AT_PHASE_ERROR:	/* Bus Phase Sequence Error */
		/*
		 * 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_LOGWARN, atior, lun,
		    GET_IID_VAL(aep->at_iid), GET_BUS_VAL(aep->at_iid));
		break;


	default:
		isp_prt(isp, ISP_LOGERR,
		    "Unknown ATIO 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_atio2(struct ispsoftc *isp, at2_entry_t *aep)