scsi: zfcp: introduce sysfs interface to read the local B2B-Credit

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.

Link: https://lore.kernel.org/r/8a53aef87b53c50cfb1a3425b799bacb6f82b832.1572018132.git.bblock@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index a2fa3db5695da01a69f52679b359403d7242e8fb..376d76b9f3378b5c623d0fd153e64be7fc857c5a 100644 (file)
--- 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,
 };