static int mptspi_write_spi_device_pg1()

in fusion/mptspi.c [89:240]

• 102 lines of code
• 27 McCabe index (conditional complexity)

static int mptspi_write_spi_device_pg1(struct scsi_target *,
				       struct _CONFIG_PAGE_SCSI_DEVICE_1 *);

static struct scsi_transport_template *mptspi_transport_template = NULL;

static u8	mptspiDoneCtx = MPT_MAX_PROTOCOL_DRIVERS;
static u8	mptspiTaskCtx = MPT_MAX_PROTOCOL_DRIVERS;
static u8	mptspiInternalCtx = MPT_MAX_PROTOCOL_DRIVERS; /* Used only for internal commands */

/**
 * 	mptspi_setTargetNegoParms  - Update the target negotiation parameters
 *	@hd: Pointer to a SCSI Host Structure
 *	@target: per target private data
 *	@sdev: SCSI device
 *
 * 	Update the target negotiation parameters based on the the Inquiry
 *	data, adapter capabilities, and NVRAM settings.
 **/
static void
mptspi_setTargetNegoParms(MPT_SCSI_HOST *hd, VirtTarget *target,
			    struct scsi_device *sdev)
{
	MPT_ADAPTER *ioc = hd->ioc;
	SpiCfgData *pspi_data = &ioc->spi_data;
	int  id = (int) target->id;
	int  nvram;
	u8 width = MPT_NARROW;
	u8 factor = MPT_ASYNC;
	u8 offset = 0;
	u8 nfactor;
	u8 noQas = 1;

	target->negoFlags = pspi_data->noQas;

	if (sdev->scsi_level < SCSI_2) {
		width = 0;
		factor = MPT_ULTRA2;
		offset = pspi_data->maxSyncOffset;
		target->tflags &= ~MPT_TARGET_FLAGS_Q_YES;
	} else {
		if (scsi_device_wide(sdev))
			width = 1;

		if (scsi_device_sync(sdev)) {
			factor = pspi_data->minSyncFactor;
			if (!scsi_device_dt(sdev))
					factor = MPT_ULTRA2;
			else {
				if (!scsi_device_ius(sdev) &&
				    !scsi_device_qas(sdev))
					factor = MPT_ULTRA160;
				else {
					factor = MPT_ULTRA320;
					if (scsi_device_qas(sdev)) {
						ddvprintk(ioc,
						printk(MYIOC_s_DEBUG_FMT "Enabling QAS due to "
						"byte56=%02x on id=%d!\n", ioc->name,
						scsi_device_qas(sdev), id));
						noQas = 0;
					}
					if (sdev->type == TYPE_TAPE &&
					    scsi_device_ius(sdev))
						target->negoFlags |= MPT_TAPE_NEGO_IDP;
				}
			}
			offset = pspi_data->maxSyncOffset;

			/* If RAID, never disable QAS
			 * else if non RAID, do not disable
			 *   QAS if bit 1 is set
			 * bit 1 QAS support, non-raid only
			 * bit 0 IU support
			 */
			if (target->raidVolume == 1)
				noQas = 0;
		} else {
			factor = MPT_ASYNC;
			offset = 0;
		}
	}

	if (!sdev->tagged_supported)
		target->tflags &= ~MPT_TARGET_FLAGS_Q_YES;

	/* Update tflags based on NVRAM settings. (SCSI only)
	 */
	if (pspi_data->nvram && (pspi_data->nvram[id] != MPT_HOST_NVRAM_INVALID)) {
		nvram = pspi_data->nvram[id];
		nfactor = (nvram & MPT_NVRAM_SYNC_MASK) >> 8;

		if (width)
			width = nvram & MPT_NVRAM_WIDE_DISABLE ? 0 : 1;

		if (offset > 0) {
			/* Ensure factor is set to the
			 * maximum of: adapter, nvram, inquiry
			 */
			if (nfactor) {
				if (nfactor < pspi_data->minSyncFactor )
					nfactor = pspi_data->minSyncFactor;

				factor = max(factor, nfactor);
				if (factor == MPT_ASYNC)
					offset = 0;
			} else {
				offset = 0;
				factor = MPT_ASYNC;
		}
		} else {
			factor = MPT_ASYNC;
		}
	}

	/* Make sure data is consistent
	 */
	if ((!width) && (factor < MPT_ULTRA2))
		factor = MPT_ULTRA2;

	/* Save the data to the target structure.
	 */
	target->minSyncFactor = factor;
	target->maxOffset = offset;
	target->maxWidth = width;

	spi_min_period(scsi_target(sdev)) = factor;
	spi_max_offset(scsi_target(sdev)) = offset;
	spi_max_width(scsi_target(sdev)) = width;

	target->tflags |= MPT_TARGET_FLAGS_VALID_NEGO;

	/* Disable unused features.
	 */
	if (!width)
		target->negoFlags |= MPT_TARGET_NO_NEGO_WIDE;

	if (!offset)
		target->negoFlags |= MPT_TARGET_NO_NEGO_SYNC;

	if ( factor > MPT_ULTRA320 )
		noQas = 0;

	if (noQas && (pspi_data->noQas == 0)) {
		pspi_data->noQas |= MPT_TARGET_NO_NEGO_QAS;
		target->negoFlags |= MPT_TARGET_NO_NEGO_QAS;

		/* Disable QAS in a mixed configuration case
		 */

		ddvprintk(ioc, printk(MYIOC_s_DEBUG_FMT
			"Disabling QAS due to noQas=%02x on id=%d!\n", ioc->name, noQas, id));
	}
}