Skip to content

Commit

Permalink
scsi: aacraid: Reworked scsi command submission path
Browse files Browse the repository at this point in the history 
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: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Dave Carroll <David.Carroll@microsemi.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
  • Loading branch information
Raghava Aditya Renukunta authored and Martin K. Petersen committed Feb 3, 2017
1 parent c83b11e commit c4e2fbc
Showing 1 changed file with 70 additions and 102 deletions.
172 changes: 70 additions & 102 deletions drivers/scsi/aacraid/aachba.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -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;
}

/*
Expand Down Expand Up @@ -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;
}
}
}
Expand All @@ -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;
Expand All @@ -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],
Expand All @@ -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;
Expand All @@ -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 |
Expand All @@ -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 */
Expand All @@ -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;
Expand Down Expand Up @@ -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:
Expand All @@ -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:
Expand Down Expand Up @@ -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:
{
Expand Down Expand Up @@ -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"));
Expand All @@ -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
*/
Expand All @@ -2892,80 +2899,41 @@ 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;
set_sense(&dev->fsa_dev[cid].sense_data,
/* 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;
set_sense(&dev->fsa_dev[cid].sense_data,
ILLEGAL_REQUEST, SENCODE_INVALID_COMMAND,
ASENCODE_INVALID_COMMAND, 0, 0);
memcpy(scsicmd->sense_buffer, &dev->fsa_dev[cid].sense_data,
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;
}

scsi_done_ret:

scsicmd->scsi_done(scsicmd);
return 0;
}

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

0 comments on commit c4e2fbc

Please sign in to comment.