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[SCSI] zfcp: add queue_full sysfs attribute

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Adds a new sysfs attribute queue_full for adapters that records the number
of incidents where a requests could not be submitted due to insufficient
free space on the request queue.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Martin Peschke <mp3@de.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:
Stefan Raspl 2008-10-01 12:42:14 +02:00 committed by James Bottomley
parent 7ae628d9d2
commit 2450d3e7b8
4 changed files with 32 additions and 7 deletions
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1
drivers/s390/scsi/zfcp_def.h
View File

@ -568,6 +568,7 @@ struct zfcp_adapter {
struct fsf_qtcb_bottom_port *stats_reset_data;
unsigned long stats_reset;
struct work_struct scan_work;
atomic_t qdio_outb_full; /* queue full incidents */
};
struct zfcp_port {

24
drivers/s390/scsi/zfcp_fsf.c
View File

@ -717,6 +717,14 @@ static int zfcp_fsf_sbal_check(struct zfcp_qdio_queue *queue)
return 0;
}
static int zfcp_fsf_sbal_available(struct zfcp_adapter *adapter)
{
unsigned int count = atomic_read(&adapter->req_q.count);
if (!count)
atomic_inc(&adapter->qdio_outb_full);
return count > 0;
}
static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
{
long ret;
@ -727,6 +735,8 @@ static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter)
zfcp_fsf_sbal_check(req_q), 5 * HZ);
if (ret > 0)
return 0;
if (!ret)
atomic_inc(&adapter->qdio_outb_full);
spin_lock_bh(&req_q->lock);
return -EIO;
@ -984,7 +994,7 @@ struct zfcp_fsf_req *zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
struct zfcp_fsf_req *req = NULL;
spin_lock(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
req_flags, adapter->pool.fsf_req_abort);
@ -1219,7 +1229,7 @@ int zfcp_fsf_send_els(struct zfcp_send_els *els)
return -EBUSY;
spin_lock(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
ZFCP_REQ_AUTO_CLEANUP, NULL);
@ -1264,7 +1274,7 @@ int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
int retval = -EIO;
spin_lock_bh(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter,
FSF_QTCB_EXCHANGE_CONFIG_DATA,
@ -1360,7 +1370,7 @@ int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
return -EOPNOTSUPP;
spin_lock_bh(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
ZFCP_REQ_AUTO_CLEANUP,
@ -1406,7 +1416,7 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
return -EOPNOTSUPP;
spin_lock_bh(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA, 0,
@ -2224,7 +2234,7 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
return -EBUSY;
spin_lock(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
adapter->pool.fsf_req_scsi);
@ -2347,7 +2357,7 @@ struct zfcp_fsf_req *zfcp_fsf_send_fcp_ctm(struct zfcp_adapter *adapter,
return NULL;
spin_lock(&adapter->req_q.lock);
if (!atomic_read(&adapter->req_q.count))
if (!zfcp_fsf_sbal_available(adapter))
goto out;
req = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
adapter->pool.fsf_req_scsi);

1
drivers/s390/scsi/zfcp_qdio.c
View File

@ -282,6 +282,7 @@ static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
addr += length, remaining -= length) {
sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
if (!sbale) {
atomic_inc(&fsf_req->adapter->qdio_outb_full);
zfcp_qdio_undo_sbals(fsf_req);
return -EINVAL;
}

13
drivers/s390/scsi/zfcp_sysfs.c
View File

@ -487,10 +487,23 @@ ZFCP_SHOST_ATTR(megabytes, "%llu %llu\n",
ZFCP_SHOST_ATTR(seconds_active, "%llu\n",
(unsigned long long) stat_info.seconds_act);
static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct Scsi_Host *scsi_host = class_to_shost(dev);
struct zfcp_adapter *adapter =
(struct zfcp_adapter *) scsi_host->hostdata[0];
return sprintf(buf, "%d\n", atomic_read(&adapter->qdio_outb_full));
}
static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL);
struct device_attribute *zfcp_sysfs_shost_attrs[] = {
&dev_attr_utilization,
&dev_attr_requests,
&dev_attr_megabytes,
&dev_attr_seconds_active,
&dev_attr_queue_full,
NULL
};