scsi: ata: libata-scsi: Handle CDL bits in ata_scsiop_maint_in()

For a scsi MAINTENANCE_IN/MI_REPORT_SUPPORTED_OPERATION_CODES operation,
add the translation of the rwcdlp and cdlp bits for the READ 16 and WRITE
16 commands. If the ATA device does not support command duration limits,
these bits are always 0. If the ATA device supports command duration
limits, the rwcdlp bit is set to 1 for READ 16 and WRITE 16 and the cdlp
bits are set to 0x1 for READ 16 and 0x2 for WRITE 16. These correspond to
the T2A mode page containing the read descriptors and to the T2B mode page
containing the write descriptors, as defined in SAT-5.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20230511011356.227789-16-nks@flawful.orgSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ata/libata-scsi.c

@@ -3235,7 +3235,7 @@ static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
 {
 	struct ata_device *dev = args->dev;
 	u8 *cdb = args->cmd->cmnd;
-	u8 supported = 0;
+	u8 supported = 0, cdlp = 0, rwcdlp = 0;
 	unsigned int err = 0;
 
 	if (cdb[2] != 1 && cdb[2] != 3) {
@@ -3262,10 +3262,8 @@ static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
 	case MAINTENANCE_IN:
 	case READ_6:
 	case READ_10:
-	case READ_16:
 	case WRITE_6:
 	case WRITE_10:
-	case WRITE_16:
 	case ATA_12:
 	case ATA_16:
 	case VERIFY:
@@ -3275,6 +3273,28 @@ static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
 	case START_STOP:
 		supported = 3;
 		break;
+	case READ_16:
+		supported = 3;
+		if (dev->flags & ATA_DFLAG_CDL) {
+			/*
+			 * CDL read descriptors map to the T2A page, that is,
+			 * rwcdlp = 0x01 and cdlp = 0x01
+			 */
+			rwcdlp = 0x01;
+			cdlp = 0x01 << 3;
+		}
+		break;
+	case WRITE_16:
+		supported = 3;
+		if (dev->flags & ATA_DFLAG_CDL) {
+			/*
+			 * CDL write descriptors map to the T2B page, that is,
+			 * rwcdlp = 0x01 and cdlp = 0x02
+			 */
+			rwcdlp = 0x01;
+			cdlp = 0x02 << 3;
+		}
+		break;
 	case ZBC_IN:
 	case ZBC_OUT:
 		if (ata_id_zoned_cap(dev->id) ||
@@ -3290,7 +3310,9 @@ static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
 		break;
 	}
 out:
-	rbuf[1] = supported; /* supported */
+	/* One command format */
+	rbuf[0] = rwcdlp;
+	rbuf[1] = cdlp | supported;
 	return err;
 }