Commit c4e2fbca authored by Raghava Aditya Renukunta's avatar Raghava Aditya Renukunta Committed by Martin K. Petersen
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scsi: aacraid: Reworked scsi command submission path 



Moved the READ and WRITE switch cases to the top. Added a  default
case to the switch case and replaced duplicate scsi result value with a
macro.

The idea is that since most of scsi commands we care about performance
wise are read or write, we need to process them first.

Internally the compiler (GCC) converts a switch case into either a jump
table or a bunch of if else conditions, so placing the often used read,
write cases at the top is an effort in optimization.

Signed-off-by: default avatarRaghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: default avatarDave Carroll <David.Carroll@microsemi.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent c83b11e3

drivers/scsi/aacraid/aachba.c

+70 −102
Original line number Diff line number Diff line
@@ -106,6 +106,8 @@ 
#define ASENCODE_LUN_FAILED_SELF_CONFIG		0x00

#define ASENCODE_OVERLAPPED_COMMAND		0x00



#define AAC_STAT_GOOD (DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD)



#define BYTE0(x) (unsigned char)(x)

#define BYTE1(x) (unsigned char)((x) >> 8)

#define BYTE2(x) (unsigned char)((x) >> 16)
@@ -2476,8 +2478,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
			if((cid >= dev->maximum_num_containers) ||

					(scsicmd->device->lun != 0)) {

				scsicmd->result = DID_NO_CONNECT << 16;

				scsicmd->scsi_done(scsicmd);

				return 0;

				goto scsi_done_ret;

			}



			/*
@@ -2512,8 +2513,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
				return aac_send_srb_fib(scsicmd);

			} else {

				scsicmd->result = DID_NO_CONNECT << 16;

				scsicmd->scsi_done(scsicmd);

				return 0;

				goto scsi_done_ret;

			}

		}

	}
@@ -2531,13 +2531,34 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
		memcpy(scsicmd->sense_buffer, &dev->fsa_dev[cid].sense_data,

		       min_t(size_t, sizeof(dev->fsa_dev[cid].sense_data),

			     SCSI_SENSE_BUFFERSIZE));

		scsicmd->scsi_done(scsicmd);

		return 0;

		goto scsi_done_ret;

	}





	/* Handle commands here that don't really require going out to the adapter */

	switch (scsicmd->cmnd[0]) {

	case READ_6:

	case READ_10:

	case READ_12:

	case READ_16:

		if (dev->in_reset)

			return -1;

		return aac_read(scsicmd);



	case WRITE_6:

	case WRITE_10:

	case WRITE_12:

	case WRITE_16:

		if (dev->in_reset)

			return -1;

		return aac_write(scsicmd);



	case SYNCHRONIZE_CACHE:

		if (((aac_cache & 6) == 6) && dev->cache_protected) {

			scsicmd->result = AAC_STAT_GOOD;

			break;

		}

		/* Issue FIB to tell Firmware to flush it's cache */

		if ((aac_cache & 6) != 2)

			return aac_synchronize(scsicmd);

	case INQUIRY:

	{

		struct inquiry_data inq_data;
@@ -2560,8 +2581,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
				arr[1] = scsicmd->cmnd[2];

				scsi_sg_copy_from_buffer(scsicmd, &inq_data,

							 sizeof(inq_data));

				scsicmd->result = DID_OK << 16 |

				  COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

				scsicmd->result = AAC_STAT_GOOD;

			} else if (scsicmd->cmnd[2] == 0x80) {

				/* unit serial number page */

				arr[3] = setinqserial(dev, &arr[4],
@@ -2572,8 +2592,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
				if (aac_wwn != 2)

					return aac_get_container_serial(

						scsicmd);

				scsicmd->result = DID_OK << 16 |

				  COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

				scsicmd->result = AAC_STAT_GOOD;

			} else if (scsicmd->cmnd[2] == 0x83) {

				/* vpd page 0x83 - Device Identification Page */

				char *sno = (char *)&inq_data;
@@ -2582,8 +2601,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
				if (aac_wwn != 2)

					return aac_get_container_serial(

						scsicmd);

				scsicmd->result = DID_OK << 16 |

				  COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

				scsicmd->result = AAC_STAT_GOOD;

			} else {

				/* vpd page not implemented */

				scsicmd->result = DID_OK << 16 |
@@ -2598,8 +2616,7 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
					sizeof(dev->fsa_dev[cid].sense_data),

					SCSI_SENSE_BUFFERSIZE));

			}

			scsicmd->scsi_done(scsicmd);

			return 0;

			break;

		}

		inq_data.inqd_ver = 2;	/* claim compliance to SCSI-2 */

		inq_data.inqd_rdf = 2;	/* A response data format value of two indicates that the data shall be in the format specified in SCSI-2 */
@@ -2615,9 +2632,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
			inq_data.inqd_pdt = INQD_PDT_PROC;	/* Processor device */

			scsi_sg_copy_from_buffer(scsicmd, &inq_data,

						 sizeof(inq_data));

			scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

			scsicmd->scsi_done(scsicmd);

			return 0;

			scsicmd->result = AAC_STAT_GOOD;

			break;

		}

		if (dev->in_reset)

			return -1;
@@ -2665,10 +2681,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
		/* Do not cache partition table for arrays */

		scsicmd->device->removable = 1;



		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);



		return 0;

		scsicmd->result = AAC_STAT_GOOD;

		break;

	}



	case READ_CAPACITY:
@@ -2693,11 +2707,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
		scsi_sg_copy_from_buffer(scsicmd, cp, sizeof(cp));

		/* Do not cache partition table for arrays */

		scsicmd->device->removable = 1;

		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 |

		  SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);



		return 0;

		scsicmd->result = AAC_STAT_GOOD;

		break;

	}



	case MODE_SENSE:
@@ -2775,10 +2786,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
		scsi_sg_copy_from_buffer(scsicmd,

					 (char *)&mpd,

					 mode_buf_length);

		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);



		return 0;

		scsicmd->result = AAC_STAT_GOOD;

		break;

	}

	case MODE_SENSE_10:

	{
@@ -2854,18 +2863,17 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
					 (char *)&mpd10,

					 mode_buf_length);



		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);



		return 0;

		scsicmd->result = AAC_STAT_GOOD;

		break;

	}

	case REQUEST_SENSE:

		dprintk((KERN_DEBUG "REQUEST SENSE command.\n"));

		memcpy(scsicmd->sense_buffer, &dev->fsa_dev[cid].sense_data, sizeof (struct sense_data));

		memset(&dev->fsa_dev[cid].sense_data, 0, sizeof (struct sense_data));

		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);

		return 0;

		memcpy(scsicmd->sense_buffer, &dev->fsa_dev[cid].sense_data,

				sizeof(struct sense_data));

		memset(&dev->fsa_dev[cid].sense_data, 0,

				sizeof(struct sense_data));

		scsicmd->result = AAC_STAT_GOOD;

		break;



	case ALLOW_MEDIUM_REMOVAL:

		dprintk((KERN_DEBUG "LOCK command.\n"));
@@ -2874,9 +2882,8 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
		else

			fsa_dev_ptr[cid].locked = 0;



		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);

		return 0;

		scsicmd->result = AAC_STAT_GOOD;

		break;

	/*

	 *	These commands are all No-Ops

	 */
@@ -2892,70 +2899,28 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
			       min_t(size_t,

				     sizeof(dev->fsa_dev[cid].sense_data),

				     SCSI_SENSE_BUFFERSIZE));

			scsicmd->scsi_done(scsicmd);

			return 0;

		break;

		}

		/* FALLTHRU */

	case RESERVE:

	case RELEASE:

	case REZERO_UNIT:

	case REASSIGN_BLOCKS:

	case SEEK_10:

		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

		scsicmd->scsi_done(scsicmd);

		return 0;

		scsicmd->result = AAC_STAT_GOOD;

		break;



	case START_STOP:

		return aac_start_stop(scsicmd);

	}



	switch (scsicmd->cmnd[0])

	{

		case READ_6:

		case READ_10:

		case READ_12:

		case READ_16:

			if (dev->in_reset)

				return -1;

			/*

			 *	Hack to keep track of ordinal number of the device that

			 *	corresponds to a container. Needed to convert

			 *	containers to /dev/sd device names

			 */



			if (scsicmd->request->rq_disk)

				strlcpy(fsa_dev_ptr[cid].devname,

				scsicmd->request->rq_disk->disk_name,

				min(sizeof(fsa_dev_ptr[cid].devname),

				sizeof(scsicmd->request->rq_disk->disk_name) + 1));



			return aac_read(scsicmd);



		case WRITE_6:

		case WRITE_10:

		case WRITE_12:

		case WRITE_16:

			if (dev->in_reset)

				return -1;

			return aac_write(scsicmd);



		case SYNCHRONIZE_CACHE:

			if (((aac_cache & 6) == 6) && dev->cache_protected) {

				scsicmd->result = DID_OK << 16 |

					COMMAND_COMPLETE << 8 | SAM_STAT_GOOD;

				scsicmd->scsi_done(scsicmd);

				return 0;

			}

			/* Issue FIB to tell Firmware to flush it's cache */

			if ((aac_cache & 6) != 2)

				return aac_synchronize(scsicmd);

	/* FALLTHRU */

	default:

	/*

	 *	Unhandled commands

	 */

			dprintk((KERN_WARNING "Unhandled SCSI Command: 0x%x.\n", scsicmd->cmnd[0]));

			scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 | SAM_STAT_CHECK_CONDITION;

		dprintk((KERN_WARNING "Unhandled SCSI Command: 0x%x.\n",

				scsicmd->cmnd[0]));

		scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 |

				SAM_STAT_CHECK_CONDITION;

		set_sense(&dev->fsa_dev[cid].sense_data,

			  ILLEGAL_REQUEST, SENCODE_INVALID_COMMAND,

			  ASENCODE_INVALID_COMMAND, 0, 0);
@@ -2963,10 +2928,13 @@ int aac_scsi_cmd(struct scsi_cmnd * scsicmd) 
				min_t(size_t,

				      sizeof(dev->fsa_dev[cid].sense_data),

				      SCSI_SENSE_BUFFERSIZE));

	}



scsi_done_ret:



	scsicmd->scsi_done(scsicmd);

	return 0;

}

}



static int query_disk(struct aac_dev *dev, void __user *arg)

{

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