[SCSI] zfcp: add queue_full sysfs attribute
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>
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 67f45fc..74d7529 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -568,6 +568,7 @@
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 {
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 49dbeb7..9e083a5 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -717,6 +717,14 @@
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 @@
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 *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 @@
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 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 @@
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 @@
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 @@
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 @@
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);
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 69d632d..cc49eaa 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -282,6 +282,7 @@
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;
}
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index 2e85c6c..7e85757 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -487,10 +487,23 @@
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
};