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scsi: zfcp: implicitly refresh config-data diagnostics when reading sysfs

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Adds implicit updates of cached diagnostics via Exchange Config Data when
reading sysfs attributes interfacing them. Right now this only affects the
new B2B-Credit diagnostic attribute.

This uses the same mechanism previously also used for cached diagnostics
of Exchange Port Data.

Link: https://lore.kernel.org/r/60a94f55f2630b74b468fed5f39880208abb2679.1572018132.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 18:12:50 +02:00 committed by Martin K. Petersen
parent 5a2876f0d1
commit 8a72db70b5
3 changed files with 36 additions and 0 deletions
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30
drivers/s390/scsi/zfcp_diag.c
View File

@ -176,6 +176,36 @@ int zfcp_diag_update_port_data_buffer(struct zfcp_adapter *const adapter)
return rc;
}
/**
* zfcp_diag_update_config_data_buffer() - Implementation of
* &typedef zfcp_diag_update_buffer_func
* to collect and update Config Data.
* @adapter: Adapter to collect Config Data from.
*
* This call is SYNCHRONOUS ! It blocks till the respective command has
* finished completely, or has failed in some way.
*
* Return:
* * 0 - Successfully retrieved new Diagnostics and Updated the buffer;
* this also includes cases where data was retrieved, but
* incomplete; you'll have to check the flag ``incomplete``
* of &struct zfcp_diag_header.
* * see zfcp_fsf_exchange_config_data_sync() for possible error-codes (
* excluding -EAGAIN)
*/
int zfcp_diag_update_config_data_buffer(struct zfcp_adapter *const adapter)
{
int rc;
rc = zfcp_fsf_exchange_config_data_sync(adapter->qdio, NULL);
if (rc == -EAGAIN)
rc = 0; /* signaling incomplete via struct zfcp_diag_header */
/* buffer-data was updated in zfcp_fsf_exchange_config_data_handler() */
return rc;
}
static int __zfcp_diag_update_buffer(struct zfcp_adapter *const adapter,
struct zfcp_diag_header *const hdr,
zfcp_diag_update_buffer_func buffer_update,

1
drivers/s390/scsi/zfcp_diag.h
View File

@ -77,6 +77,7 @@ void zfcp_diag_update_xdata(struct zfcp_diag_header *const hdr,
*/
typedef int (*zfcp_diag_update_buffer_func)(struct zfcp_adapter *const adapter);
int zfcp_diag_update_config_data_buffer(struct zfcp_adapter *const adapter);
int zfcp_diag_update_port_data_buffer(struct zfcp_adapter *const adapter);
int zfcp_diag_update_buffer_limited(struct zfcp_adapter *const adapter,
struct zfcp_diag_header *const hdr,

5
drivers/s390/scsi/zfcp_sysfs.c
View File

@ -687,6 +687,11 @@ static ssize_t zfcp_sysfs_adapter_diag_b2b_credit_show(
diag_hdr = &adapter->diagnostics->config_data.header;
rc = zfcp_diag_update_buffer_limited(
adapter, diag_hdr, zfcp_diag_update_config_data_buffer);
if (rc != 0)
goto out;
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)