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

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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>
This commit is contained in:
Benjamin Block 2019-10-25 18:12:49 +02:00 committed by Martin K. Petersen
parent 8155eb0785
commit 5a2876f0d1
1 changed files with 40 additions and 0 deletions
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40
drivers/s390/scsi/zfcp_sysfs.c
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@ -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,
};