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.renuku...@microsemi.com>
Signed-off-by: Dave Carroll <david.carr...@microsemi.com>
Reviewed-by: Johannes Thumshirn <jthumsh...@suse.de>
---
Changes in V2:
None
Changes in V3:
None
Changes in V4:
None
drivers/scsi/aacraid/aachba.c | 172 +++++++++++++++++-------------------------
1 file changed, 70 insertions(+), 102 deletions(-)
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index f2ec795..e7456a0 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -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
*/
@@ -2892,80 +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)
--
2.7.4
