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[SCSI] zfcp: Cleanup of code in zfcp_scsi.c 

Cleanup code in zfcp_scsi.c, fix coding style issues and simplify the
code.

Signed-off-by: Martin Petermann <martin@linux.vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin Petermann 2008-07-02 10:56:36 +02:00 committed by James Bottomley
parent feac6a07c4
commit f76af7d7e3
5 changed files with 184 additions and 389 deletions
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3
drivers/s390/scsi/zfcp_dbf.c
View File

@ -1065,8 +1065,7 @@ static void zfcp_scsi_dbf_event(const char *tag, const char *tag2, int level,
if (fsf_req != NULL) {
fcp_rsp = (struct fcp_rsp_iu *)
&(fsf_req->qtcb->bottom.io.fcp_rsp);
fcp_rsp_info =
zfcp_get_fcp_rsp_info_ptr(fcp_rsp);
fcp_rsp_info = (unsigned char *) &fcp_rsp[1];
fcp_sns_info =
zfcp_get_fcp_sns_info_ptr(fcp_rsp);

6
drivers/s390/scsi/zfcp_def.h
View File

@ -126,12 +126,6 @@ typedef unsigned int fcp_dl_t;
/* timeout for name-server lookup (in seconds) */
#define ZFCP_NS_GID_PN_TIMEOUT 10
/* largest SCSI command we can process */
/* FCP-2 (FCP_CMND IU) allows up to (255-3+16) */
#define ZFCP_MAX_SCSI_CMND_LENGTH 255
/* maximum number of commands in LUN queue (tagged queueing) */
#define ZFCP_CMND_PER_LUN 32
/* task attribute values in FCP-2 FCP_CMND IU */
#define SIMPLE_Q 0
#define HEAD_OF_Q 1

5
drivers/s390/scsi/zfcp_ext.h
View File

@ -102,13 +102,8 @@ extern void zfcp_test_link(struct zfcp_port *);
extern int zfcp_adapter_scsi_register(struct zfcp_adapter *);
extern void zfcp_adapter_scsi_unregister(struct zfcp_adapter *);
extern void zfcp_set_fcp_dl(struct fcp_cmnd_iu *, fcp_dl_t);
extern char *zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *);
extern char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *);
extern fcp_dl_t zfcp_get_fcp_dl(struct fcp_cmnd_iu *);
extern int zfcp_scsi_command_async(struct zfcp_adapter *,struct zfcp_unit *,
struct scsi_cmnd *, int);
extern int zfcp_scsi_command_sync(struct zfcp_unit *, struct scsi_cmnd *, int);
extern struct fc_function_template zfcp_transport_functions;
/******************************** ERP ****************************************/

4
drivers/s390/scsi/zfcp_fsf.c
View File

@ -3027,7 +3027,7 @@ zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
&(fsf_req->qtcb->bottom.io.fcp_rsp);
u32 sns_len;
char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
unsigned long flags;
read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
@ -3145,7 +3145,7 @@ zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
int retval = 0;
struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
&(fsf_req->qtcb->bottom.io.fcp_rsp);
char *fcp_rsp_info = zfcp_get_fcp_rsp_info_ptr(fcp_rsp_iu);
char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;

555
drivers/s390/scsi/zfcp_scsi.c
View File

@ -9,137 +9,32 @@
#include "zfcp_ext.h"
#include <asm/atomic.h>
static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
void (*done) (struct scsi_cmnd *));
static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *);
static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
static int zfcp_task_management_function(struct zfcp_unit *, u8,
struct scsi_cmnd *);
static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
unsigned int, unsigned int);
static struct device_attribute *zfcp_sysfs_sdev_attrs[];
static struct device_attribute *zfcp_a_stats_attrs[];
struct zfcp_data zfcp_data = {
.scsi_host_template = {
.name = "zfcp",
.module = THIS_MODULE,
.proc_name = "zfcp",
.slave_alloc = zfcp_scsi_slave_alloc,
.slave_configure = zfcp_scsi_slave_configure,
.slave_destroy = zfcp_scsi_slave_destroy,
.queuecommand = zfcp_scsi_queuecommand,
.eh_abort_handler = zfcp_scsi_eh_abort_handler,
.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
.eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
.can_queue = 4096,
.this_id = -1,
.sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
.cmd_per_lun = 1,
.use_clustering = 1,
.sdev_attrs = zfcp_sysfs_sdev_attrs,
.max_sectors = ZFCP_MAX_SECTORS,
.shost_attrs = zfcp_a_stats_attrs,
},
};
/* Find start of Response Information in FCP response unit*/
char *
zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
{
char *fcp_rsp_info_ptr;
fcp_rsp_info_ptr =
(unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
return fcp_rsp_info_ptr;
}
/* Find start of Sense Information in FCP response unit*/
char *
zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
{
char *fcp_sns_info_ptr;
fcp_sns_info_ptr =
(unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
fcp_rsp_iu->fcp_rsp_len;
fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
return fcp_sns_info_ptr;
}
static fcp_dl_t *
zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
{
int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
fcp_dl_t *fcp_dl_addr;
fcp_dl_t *fcp_dl_ptr;
fcp_dl_addr = (fcp_dl_t *)
((unsigned char *) fcp_cmd +
sizeof (struct fcp_cmnd_iu) + additional_length);
/*
* fcp_dl_addr = start address of fcp_cmnd structure +
* size of fixed part + size of dynamically sized add_dcp_cdb field
* SEE FCP-2 documentation
*/
return fcp_dl_addr;
fcp_dl_ptr = (fcp_dl_t *) ((unsigned char *) &fcp_cmd[1] +
(fcp_cmd->add_fcp_cdb_length << 2));
*fcp_dl_ptr = fcp_dl;
}
fcp_dl_t
zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
{
return *zfcp_get_fcp_dl_ptr(fcp_cmd);
}
void
zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
{
*zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
}
static int
zfcp_scsi_slave_alloc(struct scsi_device *sdp)
{
struct zfcp_adapter *adapter;
struct zfcp_unit *unit;
unsigned long flags;
int retval = -ENXIO;
adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
if (!adapter)
goto out;
read_lock_irqsave(&zfcp_data.config_lock, flags);
unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
&unit->status)) {
sdp->hostdata = unit;
unit->device = sdp;
zfcp_unit_get(unit);
retval = 0;
}
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
out:
return retval;
}
/**
* zfcp_scsi_slave_destroy - called when scsi device is removed
*
* Remove reference to associated scsi device for an zfcp_unit.
* Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
* or a scan for this device might have failed.
*/
static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
{
struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
@ -153,26 +48,16 @@ static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
}
}
/*
* called from scsi midlayer to allow finetuning of a device.
*/
static int
zfcp_scsi_slave_configure(struct scsi_device *sdp)
static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
{
if (sdp->tagged_supported)
scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
else
scsi_adjust_queue_depth(sdp, 0, 1);
return 0;
}
/**
* zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
* @scpnt: pointer to struct scsi_cmnd where result is set
* @result: result to be set in scpnt (e.g. DID_ERROR)
*/
static void
zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
{
set_host_byte(scpnt, result);
if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
@ -183,104 +68,13 @@ zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
scpnt->scsi_done(scpnt);
}
/**
* zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
* zfcp_scsi_command_sync
* @adapter: adapter where scsi command is issued
* @unit: unit to which scsi command is sent
* @scpnt: scsi command to be sent
* @timer: timer to be started if request is successfully initiated
*
* Note: In scsi_done function must be set in scpnt.
*/
int
zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
struct scsi_cmnd *scpnt, int use_timer)
{
int tmp;
int retval;
retval = 0;
BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
BUG_ON(scpnt->scsi_done == NULL);
if (unlikely(NULL == unit)) {
zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
goto out;
}
if (unlikely(
atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
!atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
zfcp_scsi_command_fail(scpnt, DID_ERROR);
goto out;
}
tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
ZFCP_REQ_AUTO_CLEANUP);
if (unlikely(tmp == -EBUSY)) {
zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
goto out;
}
if (unlikely(tmp < 0))
retval = SCSI_MLQUEUE_HOST_BUSY;
out:
return retval;
}
static void
zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
{
struct completion *wait = (struct completion *) scpnt->SCp.ptr;
complete(wait);
}
/**
* zfcp_scsi_command_sync - send a SCSI command and wait for completion
* @unit: unit where command is sent to
* @scpnt: scsi command to be sent
* @use_timer: indicates whether timer should be setup or not
* Return: 0
*
* Errors are indicated in scpnt->result
*/
int
zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
int use_timer)
{
int ret;
DECLARE_COMPLETION_ONSTACK(wait);
scpnt->SCp.ptr = (void *) &wait; /* silent re-use */
scpnt->scsi_done = zfcp_scsi_command_sync_handler;
ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
use_timer);
if (ret == 0)
wait_for_completion(&wait);
scpnt->SCp.ptr = NULL;
return 0;
}
/*
* function: zfcp_scsi_queuecommand
*
* purpose: enqueues a SCSI command to the specified target device
*
* returns: 0 - success, SCSI command enqueued
* !0 - failure
*/
static int
zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
void (*done) (struct scsi_cmnd *))
static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
void (*done) (struct scsi_cmnd *))
{
struct zfcp_unit *unit;
struct zfcp_adapter *adapter;
int status;
int ret;
/* reset the status for this request */
scpnt->result = 0;
@ -292,44 +86,76 @@ zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
* (stored there by zfcp_scsi_slave_alloc)
*/
adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
unit = (struct zfcp_unit *) scpnt->device->hostdata;
unit = scpnt->device->hostdata;
return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
BUG_ON(!adapter || (adapter != unit->port->adapter));
BUG_ON(!scpnt->scsi_done);
if (unlikely(!unit)) {
zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
return 0;
}
status = atomic_read(&unit->status);
if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
!(status & ZFCP_STATUS_COMMON_RUNNING))) {
zfcp_scsi_command_fail(scpnt, DID_ERROR);
return 0;;
}
ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
ZFCP_REQ_AUTO_CLEANUP);
if (unlikely(ret == -EBUSY))
zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
else if (unlikely(ret < 0))
return SCSI_MLQUEUE_HOST_BUSY;
return ret;
}
static struct zfcp_unit *
zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
unsigned int lun)
static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
int channel, unsigned int id,
unsigned int lun)
{
struct zfcp_port *port;
struct zfcp_unit *unit, *retval = NULL;
struct zfcp_unit *unit;
list_for_each_entry(port, &adapter->port_list_head, list) {
if (!port->rport || (id != port->rport->scsi_target_id))
continue;
list_for_each_entry(unit, &port->unit_list_head, list)
if (lun == unit->scsi_lun) {
retval = unit;
goto out;
}
if (lun == unit->scsi_lun)
return unit;
}
out:
return NULL;
}
static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
{
struct zfcp_adapter *adapter;
struct zfcp_unit *unit;
unsigned long flags;
int retval = -ENXIO;
adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
if (!adapter)
goto out;
read_lock_irqsave(&zfcp_data.config_lock, flags);
unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
if (unit &&
(atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
sdp->hostdata = unit;
unit->device = sdp;
zfcp_unit_get(unit);
retval = 0;
}
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
out:
return retval;
}
/**
* zfcp_scsi_eh_abort_handler - abort the specified SCSI command
* @scpnt: pointer to scsi_cmnd to be aborted
* Return: SUCCESS - command has been aborted and cleaned up in internal
* bookkeeping, SCSI stack won't be called for aborted command
* FAILED - otherwise
*
* We do not need to care for a SCSI command which completes normally
* but late during this abort routine runs. We are allowed to return
* late commands to the SCSI stack. It tracks the state of commands and
* will handle late commands. (Usually, the normal completion of late
* commands is ignored with respect to the running abort operation.)
*/
static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
{
struct Scsi_Host *scsi_host;
@ -337,30 +163,27 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
struct zfcp_unit *unit;
struct zfcp_fsf_req *fsf_req;
unsigned long flags;
unsigned long old_req_id;
unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
int retval = SUCCESS;
scsi_host = scpnt->device->host;
adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
unit = (struct zfcp_unit *) scpnt->device->hostdata;
unit = scpnt->device->hostdata;
/* avoid race condition between late normal completion and abort */
write_lock_irqsave(&adapter->abort_lock, flags);
/* Check whether corresponding fsf_req is still pending */
spin_lock(&adapter->req_list_lock);
fsf_req = zfcp_reqlist_find(adapter,
(unsigned long) scpnt->host_scribble);
fsf_req = zfcp_reqlist_find(adapter, old_req_id);
spin_unlock(&adapter->req_list_lock);
if (!fsf_req) {
write_unlock_irqrestore(&adapter->abort_lock, flags);
zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
retval = SUCCESS;
goto out;
return retval;
}
fsf_req->data = 0;
fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
old_req_id = fsf_req->req_id;
/* don't access old fsf_req after releasing the abort_lock */
write_unlock_irqrestore(&adapter->abort_lock, flags);
@ -370,7 +193,7 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
old_req_id);
retval = FAILED;
goto out;
return retval;
}
__wait_event(fsf_req->completion_wq,
@ -378,62 +201,30 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
retval = SUCCESS;
} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
retval = SUCCESS;
} else {
zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
retval = FAILED;
}
zfcp_fsf_req_free(fsf_req);
out:
return retval;
}
static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
{
int retval;
struct zfcp_unit *unit = scpnt->device->hostdata;
if (!unit) {
WARN_ON(1);
return SUCCESS;
}
retval = zfcp_task_management_function(unit,
FCP_LOGICAL_UNIT_RESET,
scpnt);
return retval ? FAILED : SUCCESS;
}
static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
int retval;
struct zfcp_unit *unit = scpnt->device->hostdata;
if (!unit) {
WARN_ON(1);
return SUCCESS;
}
retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
return retval ? FAILED : SUCCESS;
}
static int
zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
struct scsi_cmnd *scpnt)
static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
struct scsi_cmnd *scpnt)
{
struct zfcp_adapter *adapter = unit->port->adapter;
struct zfcp_fsf_req *fsf_req;
int retval = 0;
int retval = SUCCESS;
/* issue task management function */
fsf_req = zfcp_fsf_send_fcp_command_task_management
(adapter, unit, tm_flags, 0);
if (!fsf_req) {
zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
retval = -ENOMEM;
goto out;
return FAILED;
}
__wait_event(fsf_req->completion_wq,
@ -444,27 +235,46 @@ zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
*/
if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
retval = -EIO;
retval = FAILED;
} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
retval = -ENOTSUPP;
retval = FAILED;
} else
zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
zfcp_fsf_req_free(fsf_req);
out:
return retval;
}
/**
* zfcp_scsi_eh_host_reset_handler - handler for host reset
*/
static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
{
struct zfcp_unit *unit = scpnt->device->hostdata;
if (!unit) {
WARN_ON(1);
return SUCCESS;
}
return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
}
static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
struct zfcp_unit *unit = scpnt->device->hostdata;
if (!unit) {
WARN_ON(1);
return SUCCESS;
}
return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
}
static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
struct zfcp_unit *unit;
struct zfcp_adapter *adapter;
unit = (struct zfcp_unit*) scpnt->device->hostdata;
unit = scpnt->device->hostdata;
adapter = unit->port->adapter;
zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
zfcp_erp_wait(adapter);
@ -472,51 +282,43 @@ static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
return SUCCESS;
}
int
zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
{
int retval = 0;
static unsigned int unique_id = 0;
struct ccw_dev_id dev_id;
if (adapter->scsi_host)
goto out;
return 0;
ccw_device_get_id(adapter->ccw_device, &dev_id);
/* register adapter as SCSI host with mid layer of SCSI stack */
adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
sizeof (struct zfcp_adapter *));
if (!adapter->scsi_host) {
dev_err(&adapter->ccw_device->dev,
"registration with SCSI stack failed.");
retval = -EIO;
goto out;
return -EIO;
}
/* tell the SCSI stack some characteristics of this adapter */
adapter->scsi_host->max_id = 1;
adapter->scsi_host->max_lun = 1;
adapter->scsi_host->max_channel = 0;
adapter->scsi_host->unique_id = unique_id++; /* FIXME */
adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
adapter->scsi_host->unique_id = dev_id.devno;
adapter->scsi_host->max_cmd_len = 255;
adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
/*
* save a pointer to our own adapter data structure within
* hostdata field of SCSI host data structure
*/
adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
scsi_host_put(adapter->scsi_host);
retval = -EIO;
goto out;
return -EIO;
}
atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
out:
return retval;
return 0;
}
void
zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
{
struct Scsi_Host *shost;
struct zfcp_port *port;
@ -524,10 +326,12 @@ zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
shost = adapter->scsi_host;
if (!shost)
return;
read_lock_irq(&zfcp_data.config_lock);
list_for_each_entry(port, &adapter->port_list_head, list)
if (port->rport)
port->rport = NULL;
read_unlock_irq(&zfcp_data.config_lock);
fc_remove_host(shost);
scsi_remove_host(shost);
@ -538,9 +342,6 @@ zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
return;
}
/*
* Support functions for FC transport class
*/
static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
{
@ -556,13 +357,12 @@ zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
return adapter->fc_stats;
}
static void
zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
struct fsf_qtcb_bottom_port *data,
struct fsf_qtcb_bottom_port *old)
static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
struct fsf_qtcb_bottom_port *data,
struct fsf_qtcb_bottom_port *old)
{
fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
old->seconds_since_last_reset;
fc_stats->seconds_since_last_reset =
data->seconds_since_last_reset - old->seconds_since_last_reset;
fc_stats->tx_frames = data->tx_frames - old->tx_frames;
fc_stats->tx_words = data->tx_words - old->tx_words;
fc_stats->rx_frames = data->rx_frames - old->rx_frames;
@ -573,26 +373,25 @@ zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
fc_stats->link_failure_count = data->link_failure - old->link_failure;
fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
fc_stats->loss_of_signal_count = data->loss_of_signal -
old->loss_of_signal;
fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
old->psp_error_counts;
fc_stats->invalid_tx_word_count = data->invalid_tx_words -
old->invalid_tx_words;
fc_stats->loss_of_signal_count =
data->loss_of_signal - old->loss_of_signal;
fc_stats->prim_seq_protocol_err_count =
data->psp_error_counts - old->psp_error_counts;
fc_stats->invalid_tx_word_count =
data->invalid_tx_words - old->invalid_tx_words;
fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
fc_stats->fcp_input_requests = data->input_requests -
old->input_requests;
fc_stats->fcp_output_requests = data->output_requests -
old->output_requests;
fc_stats->fcp_control_requests = data->control_requests -
old->control_requests;
fc_stats->fcp_input_requests =
data->input_requests - old->input_requests;
fc_stats->fcp_output_requests =
data->output_requests - old->output_requests;
fc_stats->fcp_control_requests =
data->control_requests - old->control_requests;
fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
}
static void
zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
struct fsf_qtcb_bottom_port *data)
static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
struct fsf_qtcb_bottom_port *data)
{
fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
fc_stats->tx_frames = data->tx_frames;
@ -616,22 +415,14 @@ zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
fc_stats->fcp_output_megabytes = data->output_mb;
}
/**
* zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
*
* assumption: scsi_transport_fc synchronizes calls of
* get_fc_host_stats and reset_fc_host_stats
* (XXX to be checked otherwise introduce locking)
*/
static struct fc_host_statistics *
zfcp_get_fc_host_stats(struct Scsi_Host *shost)
static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
{
struct zfcp_adapter *adapter;
struct fc_host_statistics *fc_stats;
struct fsf_qtcb_bottom_port *data;
int ret;
adapter = (struct zfcp_adapter *)shost->hostdata[0];
adapter = (struct zfcp_adapter *)host->hostdata[0];
fc_stats = zfcp_init_fc_host_stats(adapter);
if (!fc_stats)
return NULL;
@ -643,26 +434,25 @@ zfcp_get_fc_host_stats(struct Scsi_Host *shost)
ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
if (ret) {
kfree(data);
return NULL; /* XXX return zeroed fc_stats? */
return NULL;
}
if (adapter->stats_reset &&
((jiffies/HZ - adapter->stats_reset) <
data->seconds_since_last_reset)) {
data->seconds_since_last_reset))
zfcp_adjust_fc_host_stats(fc_stats, data,
adapter->stats_reset_data);
} else
else
zfcp_set_fc_host_stats(fc_stats, data);
kfree(data);
return fc_stats;
}
static void
zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
{
struct zfcp_adapter *adapter;
struct fsf_qtcb_bottom_port *data, *old_data;
struct fsf_qtcb_bottom_port *data;
int ret;
adapter = (struct zfcp_adapter *)shost->hostdata[0];
@ -671,14 +461,13 @@ zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
return;
ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
if (ret) {
if (ret)
kfree(data);
} else {
else {
adapter->stats_reset = jiffies/HZ;
old_data = adapter->stats_reset_data;
kfree(adapter->stats_reset_data);
adapter->stats_reset_data = data; /* finally freed in
adater_dequeue */
kfree(old_data);
adapter_dequeue */
}
}
@ -793,14 +582,6 @@ ZFCP_DEFINE_LATENCY_ATTR(read);
ZFCP_DEFINE_LATENCY_ATTR(write);
ZFCP_DEFINE_LATENCY_ATTR(cmd);
/**
* ZFCP_DEFINE_SCSI_ATTR
* @_name: name of show attribute
* @_format: format string
* @_value: value to print
*
* Generates attribute for a unit.
*/
#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \
char *buf) \
@ -815,7 +596,8 @@ static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_
\
static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n",
unit->port->adapter->ccw_device->dev.bus_id);
ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
@ -835,8 +617,8 @@ static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
{
struct Scsi_Host *scsi_host = dev_to_shost(dev);
struct fsf_qtcb_bottom_port *qtcb_port;
int retval;
struct zfcp_adapter *adapter;
int retval;
adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
@ -857,17 +639,17 @@ static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
static int zfcp_sysfs_adapter_ex_config(struct device *dev,
struct fsf_statistics_info *stat_inf)
{
int retval;
struct fsf_qtcb_bottom_config *qtcb_config;
struct Scsi_Host *scsi_host = dev_to_shost(dev);
struct fsf_qtcb_bottom_config *qtcb_config;
struct zfcp_adapter *adapter;
int retval;
adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA))
return -EOPNOTSUPP;
qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config),
GFP_KERNEL);
GFP_KERNEL);
if (!qtcb_config)
return -ENOMEM;
@ -940,3 +722,28 @@ static struct device_attribute *zfcp_a_stats_attrs[] = {
&dev_attr_seconds_active,
NULL
};
struct zfcp_data zfcp_data = {
.scsi_host_template = {
.name = "zfcp",
.module = THIS_MODULE,
.proc_name = "zfcp",
.slave_alloc = zfcp_scsi_slave_alloc,
.slave_configure = zfcp_scsi_slave_configure,
.slave_destroy = zfcp_scsi_slave_destroy,
.queuecommand = zfcp_scsi_queuecommand,
.eh_abort_handler = zfcp_scsi_eh_abort_handler,
.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
.eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
.can_queue = 4096,
.this_id = -1,
.sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
.cmd_per_lun = 1,
.use_clustering = 1,
.sdev_attrs = zfcp_sysfs_sdev_attrs,
.max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8),
.shost_attrs = zfcp_a_stats_attrs,
},
};