void ata_scsi_simulate()

in libata-scsi.c [4058:4172]
96 lines of code
33 McCabe index (conditional complexity)

void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
{
	struct ata_scsi_args args;
	const u8 *scsicmd = cmd->cmnd;
	u8 tmp8;

	args.dev = dev;
	args.id = dev->id;
	args.cmd = cmd;

	switch(scsicmd[0]) {
	case INQUIRY:
		if (scsicmd[1] & 2)		   /* is CmdDt set?  */
			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
		else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
		else switch (scsicmd[2]) {
		case 0x00:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
			break;
		case 0x80:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
			break;
		case 0x83:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
			break;
		case 0x89:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
			break;
		case 0xb0:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
			break;
		case 0xb1:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
			break;
		case 0xb2:
			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
			break;
		case 0xb6:
			if (dev->flags & ATA_DFLAG_ZAC)
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6);
			else
				ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
			break;
		case 0xb9:
			if (dev->cpr_log)
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b9);
			else
				ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
			break;
		default:
			ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
			break;
		}
		break;

	case MODE_SENSE:
	case MODE_SENSE_10:
		ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
		break;

	case READ_CAPACITY:
		ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
		break;

	case SERVICE_ACTION_IN_16:
		if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
			ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
		else
			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
		break;

	case REPORT_LUNS:
		ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
		break;

	case REQUEST_SENSE:
		ata_scsi_set_sense(dev, cmd, 0, 0, 0);
		break;

	/* if we reach this, then writeback caching is disabled,
	 * turning this into a no-op.
	 */
	case SYNCHRONIZE_CACHE:
		fallthrough;

	/* no-op's, complete with success */
	case REZERO_UNIT:
	case SEEK_6:
	case SEEK_10:
	case TEST_UNIT_READY:
		break;

	case SEND_DIAGNOSTIC:
		tmp8 = scsicmd[1] & ~(1 << 3);
		if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4])
			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
		break;

	case MAINTENANCE_IN:
		if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
			ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
		else
			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
		break;

	/* all other commands */
	default:
		ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0);
		/* "Invalid command operation code" */
		break;
	}

	scsi_done(cmd);
}