Commit 735b830c authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Martin K. Petersen
Browse files

scsi: core: Add scsi_msg_to_host_byte() 

Add helper to convert message byte into a host byte code.

Link: https://lore.kernel.org/r/20210427083046.31620-18-hare@suse.de


Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent f6b5a697

include/scsi/scsi_cmnd.h

+26 −0
Original line number Diff line number Diff line
@@ -335,6 +335,32 @@ static inline u8 get_host_byte(struct scsi_cmnd *cmd) 
	return (cmd->result >> 16) & 0xff;

}



/**

 * scsi_msg_to_host_byte() - translate message byte

 *

 * Translate the SCSI parallel message byte to a matching

 * host byte setting. A message of COMMAND_COMPLETE indicates

 * a successful command execution, any other message indicate

 * an error. As the messages themselves only have a meaning

 * for the SCSI parallel protocol this function translates

 * them into a matching host byte value for SCSI EH.

 */

static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)

{

	switch (msg) {

	case COMMAND_COMPLETE:

		break;

	case ABORT_TASK_SET:

		set_host_byte(cmd, DID_ABORT);

		break;

	case TARGET_RESET:

		set_host_byte(cmd, DID_RESET);

		break;

	default:

		set_host_byte(cmd, DID_ERROR);

		break;

	}

}



static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)

{