In addition to the diagnostic data from the local SFP transceiver this
patch adds an interface to read the advertised buffer-to-buffer credit
from the local FC_Port.
With this patch the userspace-interface will only read data stored in
the corresponding "diagnostic buffer" (that was stored during completion
of a previous Exchange Config Data command). Implicit updating will
follow later in this series.
Reviewed-by: Steffen Maier <maier@xxxxxxxxxxxxx>
Signed-off-by: Benjamin Block <bblock@xxxxxxxxxxxxx>
---
drivers/s390/scsi/zfcp_sysfs.c | 40 ++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index a2fa3db5695d..376d76b9f337 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -666,6 +666,45 @@ struct device_attribute *zfcp_sysfs_shost_attrs[] = {
NULL
};
+static ssize_t zfcp_sysfs_adapter_diag_b2b_credit_show(
+ struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(to_ccwdev(dev));
+ struct zfcp_diag_header *diag_hdr;
+ struct fc_els_flogi *nsp;
+ ssize_t rc = -ENOLINK;
+ unsigned long flags;
+ unsigned int status;
+
+ if (!adapter)
+ return -ENODEV;
+
+ status = atomic_read(&adapter->status);
+ if (0 == (status & ZFCP_STATUS_COMMON_OPEN) ||
+ 0 == (status & ZFCP_STATUS_COMMON_UNBLOCKED) ||
+ 0 != (status & ZFCP_STATUS_COMMON_ERP_FAILED))
+ goto out;
+
+ diag_hdr = &adapter->diagnostics->config_data.header;
+
+ spin_lock_irqsave(&diag_hdr->access_lock, flags);
+ /* nport_serv_param doesn't contain the ELS_Command code */
+ nsp = (struct fc_els_flogi *)((unsigned long)
+ adapter->diagnostics->config_data
+ .data.nport_serv_param -
+ sizeof(u32));
+
+ rc = scnprintf(buf, 5 + 2, "%hu\n",
+ be16_to_cpu(nsp->fl_csp.sp_bb_cred));
+ spin_unlock_irqrestore(&diag_hdr->access_lock, flags);
+
+out:
+ zfcp_ccw_adapter_put(adapter);
+ return rc;
+}
+static ZFCP_DEV_ATTR(adapter_diag, b2b_credit, 0400,
+ zfcp_sysfs_adapter_diag_b2b_credit_show, NULL);
+
#define ZFCP_DEFINE_DIAG_SFP_ATTR(_name, _qtcb_member, _prtsize, _prtfmt) \
static ssize_t zfcp_sysfs_adapter_diag_sfp_##_name##_show( \
struct device *dev, struct device_attribute *attr, char *buf) \
@@ -733,6 +772,7 @@ static struct attribute *zfcp_sysfs_diag_attrs[] = {
&dev_attr_adapter_diag_sfp_sfp_invalid.attr,
&dev_attr_adapter_diag_sfp_connector_type.attr,
&dev_attr_adapter_diag_sfp_fec_active.attr,
+ &dev_attr_adapter_diag_b2b_credit.attr,
NULL,
};
--
2.21.0
