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Commit abbca103 authored by Stefan Richter's avatar Stefan Richter
Browse files

ieee1394: sbp2: better handling of transport errors 



If the target signals a transport failure via status block, complete the
request with DID_BUSY to indicate to the SCSI subsystem that the command
may succeed when retried.

Also log diagnostic information if the status block shows a transport
related problem.  It may point to hardware faults.

Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent 4fc383c0

drivers/ieee1394/sbp2.c

+11 −5
Original line number Diff line number Diff line
@@ -2213,28 +2213,34 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, 
		spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags);



		if (SCpnt) {

			if (STATUS_TEST_RS(sb->ORB_offset_hi_misc))

			u32 h = sb->ORB_offset_hi_misc;

			u32 r = STATUS_GET_RESP(h);



			if (r != RESP_STATUS_REQUEST_COMPLETE) {

				SBP2_WARN("resp 0x%x, sbp_status 0x%x",

					  r, STATUS_GET_SBP_STATUS(h));

				scsi_status =

					r == RESP_STATUS_TRANSPORT_FAILURE ?

					SBP2_SCSI_STATUS_BUSY :

					SBP2_SCSI_STATUS_COMMAND_TERMINATED;

			}

			/*

			 * See if the target stored any scsi status information.

			 */

			if (STATUS_GET_LEN(sb->ORB_offset_hi_misc) > 1) {

			if (STATUS_GET_LEN(h) > 1) {

				SBP2_DEBUG("CHECK CONDITION");

				scsi_status = sbp2_status_to_sense_data(

					(unchar *)sb, SCpnt->sense_buffer);

			}



			/*

			 * Check to see if the dead bit is set. If so, we'll

			 * have to initiate a fetch agent reset.

			 */

			if (STATUS_TEST_D(sb->ORB_offset_hi_misc)) {

			if (STATUS_TEST_DEAD(h)) {

				SBP2_DEBUG("Dead bit set - "

					   "initiating fetch agent reset");

                                sbp2_agent_reset(scsi_id, 0);

			}



			SBP2_ORB_DEBUG("completing command orb %p", &command->command_orb);

		}

drivers/ieee1394/sbp2.h

+3 −3
Original line number Diff line number Diff line
@@ -181,11 +181,11 @@ struct sbp2_unrestricted_page_table { 
#define SBP2_SCSI_STATUS_SELECTION_TIMEOUT	0xff



#define STATUS_GET_SRC(value)			(((value) >> 30) & 0x3)

#define STATUS_GET_RESP(value)			(((value) >> 28) & 0x3)

#define STATUS_GET_LEN(value)			(((value) >> 24) & 0x7)

#define STATUS_GET_SBP_STATUS(value)		(((value) >> 16) & 0xff)

#define STATUS_GET_ORB_OFFSET_HI(value)		((value) & 0x0000ffff)

#define STATUS_TEST_D(value)			((value) & 0x08000000)

/* test 'resp' | 'sbp2_status' */

#define STATUS_TEST_RS(value)			((value) & 0x30ff0000)

#define STATUS_TEST_DEAD(value)			((value) & 0x08000000)

/* test 'resp' | 'dead' | 'sbp2_status' */

#define STATUS_TEST_RDS(value)			((value) & 0x38ff0000)