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linux/drivers/s390/scsi/zfcp_fsf.c
Martin Petermann f76af7d7e3 [SCSI] zfcp: Cleanup of code in zfcp_scsi.c 
Cleanup code in zfcp_scsi.c, fix coding style issues and simplify the
code.

Signed-off-by: Martin Petermann <martin@linux.vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-07-12 08:22:35 -05:00

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/*
* zfcp device driver
*
* Implementation of FSF commands.
*
* Copyright IBM Corporation 2002, 2008
*/
#include "zfcp_ext.h"
static int zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *);
static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_open_port_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_close_port_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_send_fcp_command_task_management_handler(
struct zfcp_fsf_req *);
static int zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_status_read_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *);
static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *);
static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *);
static inline int zfcp_fsf_req_sbal_check(
unsigned long *, struct zfcp_qdio_queue *, int);
static inline int zfcp_use_one_sbal(
struct scatterlist *, int, struct scatterlist *, int);
static struct zfcp_fsf_req *zfcp_fsf_req_alloc(mempool_t *, int);
static int zfcp_fsf_req_send(struct zfcp_fsf_req *);
static int zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *);
static int zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *);
static int zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *);
static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *, u8,
struct fsf_link_down_info *);
static int zfcp_fsf_req_dispatch(struct zfcp_fsf_req *);
/* association between FSF command and FSF QTCB type */
static u32 fsf_qtcb_type[] = {
[FSF_QTCB_FCP_CMND] = FSF_IO_COMMAND,
[FSF_QTCB_ABORT_FCP_CMND] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_OPEN_PORT_WITH_DID] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_OPEN_LUN] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_CLOSE_LUN] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_CLOSE_PORT] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_CLOSE_PHYSICAL_PORT] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_SEND_ELS] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_SEND_GENERIC] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
[FSF_QTCB_EXCHANGE_PORT_DATA] = FSF_PORT_COMMAND,
[FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
[FSF_QTCB_UPLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND
};
static const char zfcp_act_subtable_type[5][8] = {
"unknown", "OS", "WWPN", "DID", "LUN"
};
static void zfcp_act_eval_err(struct zfcp_adapter *adapter, u32 table)
{
u16 subtable = (table & 0xffff0000) >> 16;
u16 rule = table & 0xffff;
if (subtable > 0 &&
subtable < ARRAY_SIZE(zfcp_act_subtable_type)) {
dev_warn(&adapter->ccw_device->dev,
"Access denied in subtable %s, rule %d.\n",
zfcp_act_subtable_type[subtable], rule);
}
}
static void zfcp_fsf_access_denied_port(struct zfcp_fsf_req *req,
struct zfcp_port *port)
{
struct fsf_qtcb_header *header = &req->qtcb->header;
dev_warn(&req->adapter->ccw_device->dev,
"Access denied, cannot send command to port 0x%016Lx.\n",
port->wwpn);
zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
zfcp_erp_port_access_denied(port, 55, req);
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
static void zfcp_fsf_access_denied_unit(struct zfcp_fsf_req *req,
struct zfcp_unit *unit)
{
struct fsf_qtcb_header *header = &req->qtcb->header;
dev_warn(&req->adapter->ccw_device->dev,
"Access denied for unit 0x%016Lx on port 0x%016Lx.\n",
unit->fcp_lun, unit->port->wwpn);
zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[0]);
zfcp_act_eval_err(req->adapter, header->fsf_status_qual.halfword[1]);
zfcp_erp_unit_access_denied(unit, 59, req);
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
{
dev_err(&req->adapter->ccw_device->dev,
"Required FC class not supported by adapter, "
"shutting down adapter.\n");
zfcp_erp_adapter_shutdown(req->adapter, 0, 123, req);
req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
/****************************************************************/
/*************** FSF related Functions *************************/
/****************************************************************/
/*
* function: zfcp_fsf_req_alloc
*
* purpose: Obtains an fsf_req and potentially a qtcb (for all but
* unsolicited requests) via helper functions
* Does some initial fsf request set-up.
*
* returns: pointer to allocated fsf_req if successfull
* NULL otherwise
*
* locks: none
*
*/
static struct zfcp_fsf_req *
zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
{
size_t size;
void *ptr;
struct zfcp_fsf_req *fsf_req = NULL;
if (req_flags & ZFCP_REQ_NO_QTCB)
size = sizeof(struct zfcp_fsf_req);
else
size = sizeof(struct zfcp_fsf_req_qtcb);
if (likely(pool))
ptr = mempool_alloc(pool, GFP_ATOMIC);
else {
if (req_flags & ZFCP_REQ_NO_QTCB)
ptr = kmalloc(size, GFP_ATOMIC);
else
ptr = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
GFP_ATOMIC);
}
if (unlikely(!ptr))
goto out;
memset(ptr, 0, size);
if (req_flags & ZFCP_REQ_NO_QTCB) {
fsf_req = (struct zfcp_fsf_req *) ptr;
} else {
fsf_req = &((struct zfcp_fsf_req_qtcb *) ptr)->fsf_req;
fsf_req->qtcb = &((struct zfcp_fsf_req_qtcb *) ptr)->qtcb;
}
fsf_req->pool = pool;
out:
return fsf_req;
}
/*
* function: zfcp_fsf_req_free
*
* purpose: Frees the memory of an fsf_req (and potentially a qtcb) or
* returns it into the pool via helper functions.
*
* returns: sod all
*
* locks: none
*/
void
zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
{
if (likely(fsf_req->pool)) {
mempool_free(fsf_req, fsf_req->pool);
return;
}
if (fsf_req->qtcb) {
kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, fsf_req);
return;
}
kfree(fsf_req);
}
/*
* Never ever call this without shutting down the adapter first.
* Otherwise the adapter would continue using and corrupting s390 storage.
* Included BUG_ON() call to ensure this is done.
* ERP is supposed to be the only user of this function.
*/
void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
{
struct zfcp_fsf_req *fsf_req, *tmp;
unsigned long flags;
LIST_HEAD(remove_queue);
unsigned int i;
BUG_ON(atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status));
spin_lock_irqsave(&adapter->req_list_lock, flags);
for (i = 0; i < REQUEST_LIST_SIZE; i++)
list_splice_init(&adapter->req_list[i], &remove_queue);
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
list_for_each_entry_safe(fsf_req, tmp, &remove_queue, list) {
list_del(&fsf_req->list);
fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
zfcp_fsf_req_complete(fsf_req);
}
}
/*
* function: zfcp_fsf_req_complete
*
* purpose: Updates active counts and timers for openfcp-reqs
* May cleanup request after req_eval returns
*
* returns: 0 - success
* !0 - failure
*
* context:
*/
int
zfcp_fsf_req_complete(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
int cleanup;
if (unlikely(fsf_req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) {
/*
* Note: all cleanup handling is done in the callchain of
* the function call-chain below.
*/
zfcp_fsf_status_read_handler(fsf_req);
goto out;
} else {
del_timer(&fsf_req->timer);
zfcp_fsf_protstatus_eval(fsf_req);
}
/*
* fsf_req may be deleted due to waking up functions, so
* cleanup is saved here and used later
*/
if (likely(fsf_req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
cleanup = 1;
else
cleanup = 0;
fsf_req->status |= ZFCP_STATUS_FSFREQ_COMPLETED;
/* cleanup request if requested by initiator */
if (likely(cleanup)) {
/*
* lock must not be held here since it will be
* grabed by the called routine, too
*/
zfcp_fsf_req_free(fsf_req);
} else {
/* notify initiator waiting for the requests completion */
/*
* FIXME: Race! We must not access fsf_req here as it might have been
* cleaned up already due to the set ZFCP_STATUS_FSFREQ_COMPLETED
* flag. It's an improbable case. But, we have the same paranoia for
* the cleanup flag already.
* Might better be handled using complete()?
* (setting the flag and doing wakeup ought to be atomic
* with regard to checking the flag as long as waitqueue is
* part of the to be released structure)
*/
wake_up(&fsf_req->completion_wq);
}
out:
return retval;
}
/*
* function: zfcp_fsf_protstatus_eval
*
* purpose: evaluates the QTCB of the finished FSF request
* and initiates appropriate actions
* (usually calling FSF command specific handlers)
*
* returns:
*
* context:
*
* locks:
*/
static int
zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
struct zfcp_adapter *adapter = fsf_req->adapter;
struct fsf_qtcb *qtcb = fsf_req->qtcb;
union fsf_prot_status_qual *prot_status_qual =
&qtcb->prefix.prot_status_qual;
zfcp_hba_dbf_event_fsf_response(fsf_req);
if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
ZFCP_STATUS_FSFREQ_RETRY; /* only for SCSI cmnds. */
goto skip_protstatus;
}
/* evaluate FSF Protocol Status */
switch (qtcb->prefix.prot_status) {
case FSF_PROT_GOOD:
case FSF_PROT_FSF_STATUS_PRESENTED:
break;
case FSF_PROT_QTCB_VERSION_ERROR:
dev_err(&adapter->ccw_device->dev,
"The QTCB version requested by zfcp (0x%x) is not "
"supported by the FCP adapter (lowest supported 0x%x, "
"highest supported 0x%x).\n",
ZFCP_QTCB_VERSION, prot_status_qual->word[0],
prot_status_qual->word[1]);
zfcp_erp_adapter_shutdown(adapter, 0, 117, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_SEQ_NUMB_ERROR:
zfcp_erp_adapter_reopen(adapter, 0, 98, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_UNSUPP_QTCB_TYPE:
dev_err(&adapter->ccw_device->dev,
"Packet header type used by the device driver is "
"incompatible with that used on the adapter.\n");
zfcp_erp_adapter_shutdown(adapter, 0, 118, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_HOST_CONNECTION_INITIALIZING:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
atomic_set_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&(adapter->status));
break;
case FSF_PROT_DUPLICATE_REQUEST_ID:
dev_err(&adapter->ccw_device->dev,
"The request identifier 0x%Lx is ambiguous.\n",
(unsigned long long)qtcb->bottom.support.req_handle);
zfcp_erp_adapter_shutdown(adapter, 0, 78, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_LINK_DOWN:
zfcp_fsf_link_down_info_eval(fsf_req, 37,
&prot_status_qual->link_down_info);
/* FIXME: reopening adapter now? better wait for link up */
zfcp_erp_adapter_reopen(adapter, 0, 79, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_REEST_QUEUE:
/* All ports should be marked as ready to run again */
zfcp_erp_modify_adapter_status(adapter, 28, NULL,
ZFCP_STATUS_COMMON_RUNNING,
ZFCP_SET);
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
| ZFCP_STATUS_COMMON_ERP_FAILED,
99, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PROT_ERROR_STATE:
zfcp_erp_adapter_reopen(adapter, 0, 100, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_RETRY;
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
default:
dev_err(&adapter->ccw_device->dev,
"Transfer protocol status information"
"provided by the adapter (0x%x) "
"is not compatible with the device driver.\n",
qtcb->prefix.prot_status);
zfcp_erp_adapter_shutdown(adapter, 0, 119, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
skip_protstatus:
/*
* always call specific handlers to give them a chance to do
* something meaningful even in error cases
*/
zfcp_fsf_fsfstatus_eval(fsf_req);
return retval;
}
/*
* function: zfcp_fsf_fsfstatus_eval
*
* purpose: evaluates FSF status of completed FSF request
* and acts accordingly
*
* returns:
*/
static int
zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
goto skip_fsfstatus;
}
/* evaluate FSF Status */
switch (fsf_req->qtcb->header.fsf_status) {
case FSF_UNKNOWN_COMMAND:
dev_err(&fsf_req->adapter->ccw_device->dev,
"Command issued by the device driver (0x%x) is "
"not known by the adapter.\n",
fsf_req->qtcb->header.fsf_command);
zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 120, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
zfcp_fsf_fsfstatus_qual_eval(fsf_req);
break;
}
skip_fsfstatus:
/*
* always call specific handlers to give them a chance to do
* something meaningful even in error cases
*/
zfcp_fsf_req_dispatch(fsf_req);
return retval;
}
/*
* function: zfcp_fsf_fsfstatus_qual_eval
*
* purpose: evaluates FSF status-qualifier of completed FSF request
* and acts accordingly
*
* returns:
*/
static int
zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
case FSF_SQ_FCP_RSP_AVAILABLE:
break;
case FSF_SQ_RETRY_IF_POSSIBLE:
/* The SCSI-stack may now issue retries or escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_COMMAND_ABORTED:
/* Carry the aborted state on to upper layer */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTED;
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_NO_RECOM:
dev_err(&fsf_req->adapter->ccw_device->dev,
"No recommendation could be given for a "
"problem on the adapter.\n");
zfcp_erp_adapter_shutdown(fsf_req->adapter, 0, 121, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_PROGRAMMING_ERROR:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
case FSF_SQ_NO_RETRY_POSSIBLE:
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* dealt with in the respective functions */
break;
default:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
return retval;
}
/**
* zfcp_fsf_link_down_info_eval - evaluate link down information block
*/
static void
zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *fsf_req, u8 id,
struct fsf_link_down_info *link_down)
{
struct zfcp_adapter *adapter = fsf_req->adapter;
if (atomic_test_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
&adapter->status))
return;
atomic_set_mask(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
if (link_down == NULL)
goto out;
switch (link_down->error_code) {
case FSF_PSQ_LINK_NO_LIGHT:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"no light detected.\n");
break;
case FSF_PSQ_LINK_WRAP_PLUG:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"wrap plug detected.\n");
break;
case FSF_PSQ_LINK_NO_FCP:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"adjacent node on link does not support FCP.\n");
break;
case FSF_PSQ_LINK_FIRMWARE_UPDATE:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"firmware update in progress.\n");
break;
case FSF_PSQ_LINK_INVALID_WWPN:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"duplicate or invalid WWPN detected.\n");
break;
case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"no support for NPIV by Fabric.\n");
break;
case FSF_PSQ_LINK_NO_FCP_RESOURCES:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"out of resource in FCP daughtercard.\n");
break;
case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"out of resource in Fabric.\n");
break;
case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link is down: "
"unable to login to Fabric.\n");
break;
case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"WWPN assignment file corrupted on adapter.\n");
break;
case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"Mode table corrupted on adapter.\n");
break;
case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"No WWPN for assignment table on adapter.\n");
break;
default:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The local link to adapter is down.\n");
}
out:
zfcp_erp_adapter_failed(adapter, id, fsf_req);
}
/*
* function: zfcp_fsf_req_dispatch
*
* purpose: calls the appropriate command specific handler
*
* returns:
*/
static int
zfcp_fsf_req_dispatch(struct zfcp_fsf_req *fsf_req)
{
struct zfcp_erp_action *erp_action = fsf_req->erp_action;
int retval = 0;
switch (fsf_req->fsf_command) {
case FSF_QTCB_FCP_CMND:
zfcp_fsf_send_fcp_command_handler(fsf_req);
break;
case FSF_QTCB_ABORT_FCP_CMND:
zfcp_fsf_abort_fcp_command_handler(fsf_req);
break;
case FSF_QTCB_SEND_GENERIC:
zfcp_fsf_send_ct_handler(fsf_req);
break;
case FSF_QTCB_OPEN_PORT_WITH_DID:
zfcp_fsf_open_port_handler(fsf_req);
break;
case FSF_QTCB_OPEN_LUN:
zfcp_fsf_open_unit_handler(fsf_req);
break;
case FSF_QTCB_CLOSE_LUN:
zfcp_fsf_close_unit_handler(fsf_req);
break;
case FSF_QTCB_CLOSE_PORT:
zfcp_fsf_close_port_handler(fsf_req);
break;
case FSF_QTCB_CLOSE_PHYSICAL_PORT:
zfcp_fsf_close_physical_port_handler(fsf_req);
break;
case FSF_QTCB_EXCHANGE_CONFIG_DATA:
zfcp_fsf_exchange_config_data_handler(fsf_req);
break;
case FSF_QTCB_EXCHANGE_PORT_DATA:
zfcp_fsf_exchange_port_data_handler(fsf_req);
break;
case FSF_QTCB_SEND_ELS:
zfcp_fsf_send_els_handler(fsf_req);
break;
case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
zfcp_fsf_control_file_handler(fsf_req);
break;
case FSF_QTCB_UPLOAD_CONTROL_FILE:
zfcp_fsf_control_file_handler(fsf_req);
break;
}
if (!erp_action)
return retval;
zfcp_erp_async_handler(erp_action, 0);
return retval;
}
/*
* function: zfcp_fsf_status_read
*
* purpose: initiates a Status Read command at the specified adapter
*
* returns:
*/
int
zfcp_fsf_status_read(struct zfcp_adapter *adapter, int req_flags)
{
struct zfcp_fsf_req *fsf_req;
struct fsf_status_read_buffer *status_buffer;
unsigned long lock_flags;
volatile struct qdio_buffer_element *sbale;
int retval;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_UNSOLICITED_STATUS,
req_flags | ZFCP_REQ_NO_QTCB,
adapter->pool.fsf_req_status_read,
&lock_flags, &fsf_req);
if (retval < 0)
goto failed_req_create;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_STATUS;
sbale[2].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->sbale_curr = 2;
retval = -ENOMEM;
status_buffer =
mempool_alloc(adapter->pool.data_status_read, GFP_ATOMIC);
if (!status_buffer)
goto failed_buf;
memset(status_buffer, 0, sizeof (struct fsf_status_read_buffer));
fsf_req->data = (unsigned long) status_buffer;
/* insert pointer to respective buffer */
sbale = zfcp_qdio_sbale_curr(fsf_req);
sbale->addr = (void *) status_buffer;
sbale->length = sizeof(struct fsf_status_read_buffer);
retval = zfcp_fsf_req_send(fsf_req);
if (retval)
goto failed_req_send;
goto out;
failed_req_send:
mempool_free(status_buffer, adapter->pool.data_status_read);
failed_buf:
zfcp_fsf_req_free(fsf_req);
failed_req_create:
zfcp_hba_dbf_event_fsf_unsol("fail", adapter, NULL);
out:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return retval;
}
static int
zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
{
struct fsf_status_read_buffer *status_buffer;
struct zfcp_adapter *adapter;
struct zfcp_port *port;
unsigned long flags;
status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
adapter = fsf_req->adapter;
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &adapter->port_list_head, list)
if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
break;
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK)))
goto out;
switch (status_buffer->status_subtype) {
case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
zfcp_erp_port_reopen(port, 0, 101, fsf_req);
break;
case FSF_STATUS_READ_SUB_ERROR_PORT:
zfcp_erp_port_shutdown(port, 0, 122, fsf_req);
break;
}
out:
return 0;
}
static void zfcp_fsf_bit_error_threshold(struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = req->adapter;
struct fsf_status_read_buffer *buf =
(struct fsf_status_read_buffer *) req->data;
struct fsf_bit_error_payload *err =
(struct fsf_bit_error_payload *) buf->payload;
dev_warn(&adapter->ccw_device->dev,
"Warning: bit error threshold data "
"received for the adapter: "
"link failures = %i, loss of sync errors = %i, "
"loss of signal errors = %i, "
"primitive sequence errors = %i, "
"invalid transmission word errors = %i, "
"CRC errors = %i).\n",
err->link_failure_error_count,
err->loss_of_sync_error_count,
err->loss_of_signal_error_count,
err->primitive_sequence_error_count,
err->invalid_transmission_word_error_count,
err->crc_error_count);
dev_warn(&adapter->ccw_device->dev,
"Additional bit error threshold data of the adapter: "
"primitive sequence event time-outs = %i, "
"elastic buffer overrun errors = %i, "
"advertised receive buffer-to-buffer credit = %i, "
"current receice buffer-to-buffer credit = %i, "
"advertised transmit buffer-to-buffer credit = %i, "
"current transmit buffer-to-buffer credit = %i).\n",
err->primitive_sequence_event_timeout_count,
err->elastic_buffer_overrun_error_count,
err->advertised_receive_b2b_credit,
err->current_receive_b2b_credit,
err->advertised_transmit_b2b_credit,
err->current_transmit_b2b_credit);
}
/*
* function: zfcp_fsf_status_read_handler
*
* purpose: is called for finished Open Port command
*
* returns:
*/
static int
zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
struct zfcp_adapter *adapter = fsf_req->adapter;
struct fsf_status_read_buffer *status_buffer =
(struct fsf_status_read_buffer *) fsf_req->data;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
mempool_free(status_buffer, adapter->pool.data_status_read);
zfcp_fsf_req_free(fsf_req);
goto out;
}
zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);
switch (status_buffer->status_type) {
case FSF_STATUS_READ_PORT_CLOSED:
zfcp_fsf_status_read_port_closed(fsf_req);
break;
case FSF_STATUS_READ_INCOMING_ELS:
zfcp_fc_incoming_els(fsf_req);
break;
case FSF_STATUS_READ_SENSE_DATA_AVAIL:
break;
case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
zfcp_fsf_bit_error_threshold(fsf_req);
break;
case FSF_STATUS_READ_LINK_DOWN:
switch (status_buffer->status_subtype) {
case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
dev_warn(&adapter->ccw_device->dev,
"Physical link is down.\n");
zfcp_fsf_link_down_info_eval(fsf_req, 38,
(struct fsf_link_down_info *)
&status_buffer->payload);
break;
case FSF_STATUS_READ_SUB_FDISC_FAILED:
dev_warn(&adapter->ccw_device->dev,
"Local link is down "
"due to failed FDISC login.\n");
zfcp_fsf_link_down_info_eval(fsf_req, 39,
(struct fsf_link_down_info *)
&status_buffer->payload);
break;
case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
dev_warn(&adapter->ccw_device->dev,
"Local link is down "
"due to firmware update on adapter.\n");
zfcp_fsf_link_down_info_eval(fsf_req, 40, NULL);
break;
default:
dev_warn(&adapter->ccw_device->dev,
"Local link is down.\n");
zfcp_fsf_link_down_info_eval(fsf_req, 41, NULL);
};
break;
case FSF_STATUS_READ_LINK_UP:
dev_info(&adapter->ccw_device->dev,
"Local link was replugged.\n");
/* All ports should be marked as ready to run again */
zfcp_erp_modify_adapter_status(adapter, 30, NULL,
ZFCP_STATUS_COMMON_RUNNING,
ZFCP_SET);
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
| ZFCP_STATUS_COMMON_ERP_FAILED,
102, fsf_req);
break;
case FSF_STATUS_READ_NOTIFICATION_LOST:
if (status_buffer->status_subtype &
FSF_STATUS_READ_SUB_ACT_UPDATED)
zfcp_erp_adapter_access_changed(adapter, 135, fsf_req);
if (status_buffer->status_subtype &
FSF_STATUS_READ_SUB_INCOMING_ELS)
schedule_work(&adapter->scan_work);
break;
case FSF_STATUS_READ_CFDC_UPDATED:
zfcp_erp_adapter_access_changed(adapter, 136, fsf_req);
break;
case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
adapter->adapter_features = *(u32*) status_buffer->payload;
break;
}
mempool_free(status_buffer, adapter->pool.data_status_read);
zfcp_fsf_req_free(fsf_req);
/*
* recycle buffer and start new request repeat until outbound
* queue is empty or adapter shutdown is requested
*/
/*
* FIXME(qdio):
* we may wait in the req_create for 5s during shutdown, so
* qdio_cleanup will have to wait at least that long before returning
* with failure to allow us a proper cleanup under all circumstances
*/
/*
* FIXME:
* allocation failure possible? (Is this code needed?)
*/
atomic_inc(&adapter->stat_miss);
schedule_work(&adapter->stat_work);
out:
return retval;
}
/*
* function: zfcp_fsf_abort_fcp_command
*
* purpose: tells FSF to abort a running SCSI command
*
* returns: address of initiated FSF request
* NULL - request could not be initiated
*
* FIXME(design): should be watched by a timeout !!!
* FIXME(design) shouldn't this be modified to return an int
* also...don't know how though
*/
struct zfcp_fsf_req *
zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
struct zfcp_adapter *adapter,
struct zfcp_unit *unit, int req_flags)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req = NULL;
unsigned long lock_flags;
int retval = 0;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
req_flags, adapter->pool.fsf_req_abort,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&unit->status)))
goto unit_blocked;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->data = (unsigned long) unit;
/* set handles of unit and its parent port in QTCB */
fsf_req->qtcb->header.lun_handle = unit->handle;
fsf_req->qtcb->header.port_handle = unit->port->handle;
/* set handle of request which should be aborted */
fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;
zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
if (!retval)
goto out;
unit_blocked:
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
out:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return fsf_req;
}
/*
* function: zfcp_fsf_abort_fcp_command_handler
*
* purpose: is called for finished Abort FCP Command request
*
* returns:
*/
static int
zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
{
int retval = -EINVAL;
struct zfcp_unit *unit;
union fsf_status_qual *fsf_stat_qual =
&new_fsf_req->qtcb->header.fsf_status_qual;
if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
/* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
goto skip_fsfstatus;
}
unit = (struct zfcp_unit *) new_fsf_req->data;
/* evaluate FSF status in QTCB */
switch (new_fsf_req->qtcb->header.fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
/*
* In this case a command that was sent prior to a port
* reopen was aborted (handles are different). This is
* fine.
*/
} else {
/* Let's hope this sorts out the mess */
zfcp_erp_adapter_reopen(unit->port->adapter, 0, 104,
new_fsf_req);
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
break;
case FSF_LUN_HANDLE_NOT_VALID:
if (fsf_stat_qual->word[0] != fsf_stat_qual->word[1]) {
/*
* In this case a command that was sent prior to a unit
* reopen was aborted (handles are different).
* This is fine.
*/
} else {
/* Let's hope this sorts out the mess */
zfcp_erp_port_reopen(unit->port, 0, 105, new_fsf_req);
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
break;
case FSF_FCP_COMMAND_DOES_NOT_EXIST:
retval = 0;
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
break;
case FSF_PORT_BOXED:
zfcp_erp_port_boxed(unit->port, 47, new_fsf_req);
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
| ZFCP_STATUS_FSFREQ_RETRY;
break;
case FSF_LUN_BOXED:
zfcp_erp_unit_boxed(unit, 48, new_fsf_req);
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
| ZFCP_STATUS_FSFREQ_RETRY;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (new_fsf_req->qtcb->header.fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
zfcp_test_link(unit->port);
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* SCSI stack will escalate */
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
retval = 0;
new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
break;
}
skip_fsfstatus:
return retval;
}
/**
* zfcp_use_one_sbal - checks whether req buffer and resp bother each fit into
* one SBALE
* Two scatter-gather lists are passed, one for the reqeust and one for the
* response.
*/
static inline int
zfcp_use_one_sbal(struct scatterlist *req, int req_count,
struct scatterlist *resp, int resp_count)
{
return ((req_count == 1) &&
(resp_count == 1) &&
(((unsigned long) zfcp_sg_to_address(&req[0]) &
PAGE_MASK) ==
((unsigned long) (zfcp_sg_to_address(&req[0]) +
req[0].length - 1) & PAGE_MASK)) &&
(((unsigned long) zfcp_sg_to_address(&resp[0]) &
PAGE_MASK) ==
((unsigned long) (zfcp_sg_to_address(&resp[0]) +
resp[0].length - 1) & PAGE_MASK)));
}
/**
* zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
* @ct: pointer to struct zfcp_send_ct which conatins all needed data for
* the request
* @pool: pointer to memory pool, if non-null this pool is used to allocate
* a struct zfcp_fsf_req
* @erp_action: pointer to erp_action, if non-null the Generic Service request
* is sent within error recovery
*/
int
zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_port *port;
struct zfcp_adapter *adapter;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int bytes;
int ret = 0;
port = ct->port;
adapter = port->adapter;
ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_GENERIC,
ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
pool, &lock_flags, &fsf_req);
if (ret < 0)
goto failed_req;
sbale = zfcp_qdio_sbale_req(fsf_req);
if (zfcp_use_one_sbal(ct->req, ct->req_count,
ct->resp, ct->resp_count)){
/* both request buffer and response buffer
fit into one sbale each */
sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
sbale[2].addr = zfcp_sg_to_address(&ct->req[0]);
sbale[2].length = ct->req[0].length;
sbale[3].addr = zfcp_sg_to_address(&ct->resp[0]);
sbale[3].length = ct->resp[0].length;
sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
} else if (adapter->adapter_features &
FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
/* try to use chained SBALs */
bytes = zfcp_qdio_sbals_from_sg(fsf_req,
SBAL_FLAGS0_TYPE_WRITE_READ,
ct->req,
ZFCP_MAX_SBALS_PER_CT_REQ);
if (bytes <= 0) {
if (bytes == 0)
ret = -ENOMEM;
else
ret = bytes;
goto failed_send;
}
fsf_req->qtcb->bottom.support.req_buf_length = bytes;
fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
bytes = zfcp_qdio_sbals_from_sg(fsf_req,
SBAL_FLAGS0_TYPE_WRITE_READ,
ct->resp,
ZFCP_MAX_SBALS_PER_CT_REQ);
if (bytes <= 0) {
if (bytes == 0)
ret = -ENOMEM;
else
ret = bytes;
goto failed_send;
}
fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
} else {
/* reject send generic request */
ret = -EOPNOTSUPP;
goto failed_send;
}
/* settings in QTCB */
fsf_req->qtcb->header.port_handle = port->handle;
fsf_req->qtcb->bottom.support.service_class =
ZFCP_FC_SERVICE_CLASS_DEFAULT;
fsf_req->qtcb->bottom.support.timeout = ct->timeout;
fsf_req->data = (unsigned long) ct;
zfcp_san_dbf_event_ct_request(fsf_req);
if (erp_action) {
erp_action->fsf_req = fsf_req;
fsf_req->erp_action = erp_action;
zfcp_erp_start_timer(fsf_req);
} else
zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
ret = zfcp_fsf_req_send(fsf_req);
if (ret)
goto failed_send;
goto out;
failed_send:
zfcp_fsf_req_free(fsf_req);
if (erp_action != NULL) {
erp_action->fsf_req = NULL;
}
failed_req:
out:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return ret;
}
/**
* zfcp_fsf_send_ct_handler - handler for Generic Service requests
* @fsf_req: pointer to struct zfcp_fsf_req
*
* Data specific for the Generic Service request is passed using
* fsf_req->data. There we find the pointer to struct zfcp_send_ct.
* Usually a specific handler for the CT request is called which is
* found in this structure.
*/
static int
zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *fsf_req)
{
struct zfcp_port *port;
struct zfcp_adapter *adapter;
struct zfcp_send_ct *send_ct;
struct fsf_qtcb_header *header;
struct fsf_qtcb_bottom_support *bottom;
int retval = -EINVAL;
adapter = fsf_req->adapter;
send_ct = (struct zfcp_send_ct *) fsf_req->data;
port = send_ct->port;
header = &fsf_req->qtcb->header;
bottom = &fsf_req->qtcb->bottom.support;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
goto skip_fsfstatus;
/* evaluate FSF status in QTCB */
switch (header->fsf_status) {
case FSF_GOOD:
zfcp_san_dbf_event_ct_response(fsf_req);
retval = 0;
break;
case FSF_SERVICE_CLASS_NOT_SUPPORTED:
zfcp_fsf_class_not_supp(fsf_req);
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]){
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* reopening link to port */
zfcp_test_link(port);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* ERP strategy will escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_ACCESS_DENIED:
zfcp_fsf_access_denied_port(fsf_req, port);
break;
case FSF_GENERIC_COMMAND_REJECTED:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(adapter, 0, 106, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_BOXED:
zfcp_erp_port_boxed(port, 49, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
| ZFCP_STATUS_FSFREQ_RETRY;
break;
/* following states should never occure, all cases avoided
in zfcp_fsf_send_ct - but who knows ... */
case FSF_PAYLOAD_SIZE_MISMATCH:
case FSF_REQUEST_SIZE_TOO_LARGE:
case FSF_RESPONSE_SIZE_TOO_LARGE:
case FSF_SBAL_MISMATCH:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
default:
break;
}
skip_fsfstatus:
send_ct->status = retval;
if (send_ct->handler != NULL)
send_ct->handler(send_ct->handler_data);
return retval;
}
/**
* zfcp_fsf_send_els - initiate an ELS command (FC-FS)
* @els: pointer to struct zfcp_send_els which contains all needed data for
* the command.
*/
int
zfcp_fsf_send_els(struct zfcp_send_els *els)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
u32 d_id;
struct zfcp_adapter *adapter;
unsigned long lock_flags;
int bytes;
int ret = 0;
d_id = els->d_id;
adapter = els->adapter;
ret = zfcp_fsf_req_create(adapter, FSF_QTCB_SEND_ELS,
ZFCP_REQ_AUTO_CLEANUP,
NULL, &lock_flags, &fsf_req);
if (ret < 0)
goto failed_req;
if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&els->port->status))) {
ret = -EBUSY;
goto port_blocked;
}
sbale = zfcp_qdio_sbale_req(fsf_req);
if (zfcp_use_one_sbal(els->req, els->req_count,
els->resp, els->resp_count)){
/* both request buffer and response buffer
fit into one sbale each */
sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
sbale[2].addr = zfcp_sg_to_address(&els->req[0]);
sbale[2].length = els->req[0].length;
sbale[3].addr = zfcp_sg_to_address(&els->resp[0]);
sbale[3].length = els->resp[0].length;
sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
} else if (adapter->adapter_features &
FSF_FEATURE_ELS_CT_CHAINED_SBALS) {
/* try to use chained SBALs */
bytes = zfcp_qdio_sbals_from_sg(fsf_req,
SBAL_FLAGS0_TYPE_WRITE_READ,
els->req,
ZFCP_MAX_SBALS_PER_ELS_REQ);
if (bytes <= 0) {
if (bytes == 0) {
ret = -ENOMEM;
} else {
ret = bytes;
}
goto failed_send;
}
fsf_req->qtcb->bottom.support.req_buf_length = bytes;
fsf_req->sbale_curr = ZFCP_LAST_SBALE_PER_SBAL;
bytes = zfcp_qdio_sbals_from_sg(fsf_req,
SBAL_FLAGS0_TYPE_WRITE_READ,
els->resp,
ZFCP_MAX_SBALS_PER_ELS_REQ);
if (bytes <= 0) {
if (bytes == 0) {
ret = -ENOMEM;
} else {
ret = bytes;
}
goto failed_send;
}
fsf_req->qtcb->bottom.support.resp_buf_length = bytes;
} else {
/* reject request */
ret = -EOPNOTSUPP;
goto failed_send;
}
/* settings in QTCB */
fsf_req->qtcb->bottom.support.d_id = d_id;
fsf_req->qtcb->bottom.support.service_class =
ZFCP_FC_SERVICE_CLASS_DEFAULT;
fsf_req->qtcb->bottom.support.timeout = ZFCP_ELS_TIMEOUT;
fsf_req->data = (unsigned long) els;
sbale = zfcp_qdio_sbale_req(fsf_req);
zfcp_san_dbf_event_els_request(fsf_req);
zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
ret = zfcp_fsf_req_send(fsf_req);
if (ret)
goto failed_send;
goto out;
port_blocked:
failed_send:
zfcp_fsf_req_free(fsf_req);
failed_req:
out:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return ret;
}
/**
* zfcp_fsf_send_els_handler - handler for ELS commands
* @fsf_req: pointer to struct zfcp_fsf_req
*
* Data specific for the ELS command is passed using
* fsf_req->data. There we find the pointer to struct zfcp_send_els.
* Usually a specific handler for the ELS command is called which is
* found in this structure.
*/
static int zfcp_fsf_send_els_handler(struct zfcp_fsf_req *fsf_req)
{
struct zfcp_adapter *adapter;
struct zfcp_port *port;
u32 d_id;
struct fsf_qtcb_header *header;
struct fsf_qtcb_bottom_support *bottom;
struct zfcp_send_els *send_els;
int retval = -EINVAL;
send_els = (struct zfcp_send_els *) fsf_req->data;
adapter = send_els->adapter;
port = send_els->port;
d_id = send_els->d_id;
header = &fsf_req->qtcb->header;
bottom = &fsf_req->qtcb->bottom.support;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
goto skip_fsfstatus;
switch (header->fsf_status) {
case FSF_GOOD:
zfcp_san_dbf_event_els_response(fsf_req);
retval = 0;
break;
case FSF_SERVICE_CLASS_NOT_SUPPORTED:
zfcp_fsf_class_not_supp(fsf_req);
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]){
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
if (port && (send_els->ls_code != ZFCP_LS_ADISC))
zfcp_test_link(port);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_RETRY_IF_POSSIBLE:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_ELS_COMMAND_REJECTED:
case FSF_PAYLOAD_SIZE_MISMATCH:
case FSF_REQUEST_SIZE_TOO_LARGE:
case FSF_RESPONSE_SIZE_TOO_LARGE:
break;
case FSF_SBAL_MISMATCH:
/* should never occure, avoided in zfcp_fsf_send_els */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ACCESS_DENIED:
zfcp_fsf_access_denied_port(fsf_req, port);
break;
default:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
skip_fsfstatus:
send_els->status = retval;
if (send_els->handler)
send_els->handler(send_els->handler_data);
return retval;
}
int
zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
struct zfcp_adapter *adapter = erp_action->adapter;
unsigned long lock_flags;
int retval;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter,
FSF_QTCB_EXCHANGE_CONFIG_DATA,
ZFCP_REQ_AUTO_CLEANUP,
adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval) {
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return retval;
}
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->qtcb->bottom.config.feature_selection =
FSF_FEATURE_CFDC |
FSF_FEATURE_LUN_SHARING |
FSF_FEATURE_NOTIFICATION_LOST |
FSF_FEATURE_UPDATE_ALERT;
fsf_req->erp_action = erp_action;
erp_action->fsf_req = fsf_req;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(fsf_req);
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
}
return retval;
}
int
zfcp_fsf_exchange_config_data_sync(struct zfcp_adapter *adapter,
struct fsf_qtcb_bottom_config *data)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_CONFIG_DATA,
ZFCP_WAIT_FOR_SBAL, NULL, &lock_flags,
&fsf_req);
if (retval) {
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return retval;
}
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->qtcb->bottom.config.feature_selection =
FSF_FEATURE_CFDC |
FSF_FEATURE_LUN_SHARING |
FSF_FEATURE_NOTIFICATION_LOST |
FSF_FEATURE_UPDATE_ALERT;
if (data)
fsf_req->data = (unsigned long) data;
zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
if (!retval)
wait_event(fsf_req->completion_wq,
fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
zfcp_fsf_req_free(fsf_req);
return retval;
}
/**
* zfcp_fsf_exchange_config_evaluate
* @fsf_req: fsf_req which belongs to xchg config data request
* @xchg_ok: specifies if xchg config data was incomplete or complete (0/1)
*
* returns: -EIO on error, 0 otherwise
*/
static int
zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
{
struct fsf_qtcb_bottom_config *bottom;
struct zfcp_adapter *adapter = fsf_req->adapter;
struct Scsi_Host *shost = adapter->scsi_host;
bottom = &fsf_req->qtcb->bottom.config;
adapter->fsf_lic_version = bottom->lic_version;
adapter->adapter_features = bottom->adapter_features;
adapter->connection_features = bottom->connection_features;
adapter->peer_wwpn = 0;
adapter->peer_wwnn = 0;
adapter->peer_d_id = 0;
if (xchg_ok) {
if (fsf_req->data)
memcpy((struct fsf_qtcb_bottom_config *) fsf_req->data,
bottom, sizeof (struct fsf_qtcb_bottom_config));
fc_host_node_name(shost) = bottom->nport_serv_param.wwnn;
fc_host_port_name(shost) = bottom->nport_serv_param.wwpn;
fc_host_port_id(shost) = bottom->s_id & ZFCP_DID_MASK;
fc_host_speed(shost) = bottom->fc_link_speed;
fc_host_supported_classes(shost) =
FC_COS_CLASS2 | FC_COS_CLASS3;
adapter->hydra_version = bottom->adapter_type;
adapter->timer_ticks = bottom->timer_interval;
if (fc_host_permanent_port_name(shost) == -1)
fc_host_permanent_port_name(shost) =
fc_host_port_name(shost);
if (bottom->fc_topology == FSF_TOPO_P2P) {
adapter->peer_d_id = bottom->peer_d_id & ZFCP_DID_MASK;
adapter->peer_wwpn = bottom->plogi_payload.wwpn;
adapter->peer_wwnn = bottom->plogi_payload.wwnn;
fc_host_port_type(shost) = FC_PORTTYPE_PTP;
} else if (bottom->fc_topology == FSF_TOPO_FABRIC)
fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
else if (bottom->fc_topology == FSF_TOPO_AL)
fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
else
fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
} else {
fc_host_node_name(shost) = 0;
fc_host_port_name(shost) = 0;
fc_host_port_id(shost) = 0;
fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
adapter->hydra_version = 0;
}
if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
adapter->hardware_version = bottom->hardware_version;
memcpy(fc_host_serial_number(shost), bottom->serial_number,
min(FC_SERIAL_NUMBER_SIZE, 17));
EBCASC(fc_host_serial_number(shost),
min(FC_SERIAL_NUMBER_SIZE, 17));
}
if (ZFCP_QTCB_VERSION < bottom->low_qtcb_version) {
dev_err(&adapter->ccw_device->dev,
"The adapter only supports newer control block "
"versions, try updated device driver.\n");
zfcp_erp_adapter_shutdown(adapter, 0, 125, fsf_req);
return -EIO;
}
if (ZFCP_QTCB_VERSION > bottom->high_qtcb_version) {
dev_err(&adapter->ccw_device->dev,
"The adapter only supports older control block "
"versions, consider a microcode upgrade.\n");
zfcp_erp_adapter_shutdown(adapter, 0, 126, fsf_req);
return -EIO;
}
return 0;
}
/**
* function: zfcp_fsf_exchange_config_data_handler
*
* purpose: is called for finished Exchange Configuration Data command
*
* returns:
*/
static int
zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *fsf_req)
{
struct fsf_qtcb_bottom_config *bottom;
struct zfcp_adapter *adapter = fsf_req->adapter;
struct fsf_qtcb *qtcb = fsf_req->qtcb;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
return -EIO;
switch (qtcb->header.fsf_status) {
case FSF_GOOD:
if (zfcp_fsf_exchange_config_evaluate(fsf_req, 1))
return -EIO;
switch (fc_host_port_type(adapter->scsi_host)) {
case FC_PORTTYPE_PTP:
if (fsf_req->erp_action)
dev_info(&adapter->ccw_device->dev,
"Point-to-Point fibrechannel "
"configuration detected.\n");
break;
case FC_PORTTYPE_NLPORT:
dev_err(&adapter->ccw_device->dev,
"Unsupported arbitrated loop fibrechannel "
"topology detected, shutting down adapter\n");
zfcp_erp_adapter_shutdown(adapter, 0, 127, fsf_req);
return -EIO;
case FC_PORTTYPE_NPORT:
if (fsf_req->erp_action)
dev_info(&adapter->ccw_device->dev,
"Switched fabric fibrechannel "
"network detected.\n");
break;
default:
dev_err(&adapter->ccw_device->dev,
"The fibrechannel topology reported by the "
"adapter is not known by the zfcp driver, "
"shutting down adapter.\n");
zfcp_erp_adapter_shutdown(adapter, 0, 128, fsf_req);
return -EIO;
}
bottom = &qtcb->bottom.config;
if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
dev_err(&adapter->ccw_device->dev,
"Maximum QTCB size (%d bytes) allowed by "
"the adapter is lower than the minimum "
"required by the driver (%ld bytes).\n",
bottom->max_qtcb_size, sizeof(struct fsf_qtcb));
zfcp_erp_adapter_shutdown(adapter, 0, 129, fsf_req);
return -EIO;
}
atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
&adapter->status);
break;
case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
if (zfcp_fsf_exchange_config_evaluate(fsf_req, 0))
return -EIO;
atomic_set_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
&adapter->status);
zfcp_fsf_link_down_info_eval(fsf_req, 42,
&qtcb->header.fsf_status_qual.link_down_info);
break;
default:
zfcp_erp_adapter_shutdown(adapter, 0, 130, fsf_req);
return -EIO;
}
return 0;
}
/**
* zfcp_fsf_exchange_port_data - request information about local port
* @erp_action: ERP action for the adapter for which port data is requested
*/
int
zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
struct zfcp_adapter *adapter = erp_action->adapter;
unsigned long lock_flags;
int retval;
if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
return -EOPNOTSUPP;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
ZFCP_REQ_AUTO_CLEANUP,
adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval) {
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return retval;
}
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
erp_action->fsf_req = fsf_req;
fsf_req->erp_action = erp_action;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(fsf_req);
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
}
return retval;
}
/**
* zfcp_fsf_exchange_port_data_sync - request information about local port
* and wait until information is ready
*/
int
zfcp_fsf_exchange_port_data_sync(struct zfcp_adapter *adapter,
struct fsf_qtcb_bottom_port *data)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval;
if (!(adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
return -EOPNOTSUPP;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_EXCHANGE_PORT_DATA,
0, NULL, &lock_flags, &fsf_req);
if (retval) {
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return retval;
}
if (data)
fsf_req->data = (unsigned long) data;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
if (!retval)
wait_event(fsf_req->completion_wq,
fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
zfcp_fsf_req_free(fsf_req);
return retval;
}
/**
* zfcp_fsf_exchange_port_evaluate
* @fsf_req: fsf_req which belongs to xchg port data request
* @xchg_ok: specifies if xchg port data was incomplete or complete (0/1)
*/
static void
zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *fsf_req, int xchg_ok)
{
struct zfcp_adapter *adapter;
struct fsf_qtcb_bottom_port *bottom;
struct Scsi_Host *shost;
adapter = fsf_req->adapter;
bottom = &fsf_req->qtcb->bottom.port;
shost = adapter->scsi_host;
if (fsf_req->data)
memcpy((struct fsf_qtcb_bottom_port*) fsf_req->data, bottom,
sizeof(struct fsf_qtcb_bottom_port));
if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
fc_host_permanent_port_name(shost) = bottom->wwpn;
else
fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
fc_host_supported_speeds(shost) = bottom->supported_speed;
}
/**
* zfcp_fsf_exchange_port_data_handler - handler for exchange_port_data request
* @fsf_req: pointer to struct zfcp_fsf_req
*/
static void
zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *fsf_req)
{
struct zfcp_adapter *adapter;
struct fsf_qtcb *qtcb;
adapter = fsf_req->adapter;
qtcb = fsf_req->qtcb;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
return;
switch (qtcb->header.fsf_status) {
case FSF_GOOD:
zfcp_fsf_exchange_port_evaluate(fsf_req, 1);
atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
break;
case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
zfcp_fsf_exchange_port_evaluate(fsf_req, 0);
atomic_set_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
zfcp_fsf_link_down_info_eval(fsf_req, 43,
&qtcb->header.fsf_status_qual.link_down_info);
break;
}
}
/*
* function: zfcp_fsf_open_port
*
* purpose:
*
* returns: address of initiated FSF request
* NULL - request could not be initiated
*/
int
zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval = 0;
/* setup new FSF request */
retval = zfcp_fsf_req_create(erp_action->adapter,
FSF_QTCB_OPEN_PORT_WITH_DID,
ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
erp_action->adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->qtcb->bottom.support.d_id = erp_action->port->d_id;
atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->port->status);
fsf_req->data = (unsigned long) erp_action->port;
fsf_req->erp_action = erp_action;
erp_action->fsf_req = fsf_req;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(fsf_req);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
goto out;
}
out:
write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
return retval;
}
/*
* function: zfcp_fsf_open_port_handler
*
* purpose: is called for finished Open Port command
*
* returns:
*/
static int
zfcp_fsf_open_port_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = -EINVAL;
struct zfcp_port *port;
struct fsf_plogi *plogi;
struct fsf_qtcb_header *header;
port = (struct zfcp_port *) fsf_req->data;
header = &fsf_req->qtcb->header;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
/* don't change port status in our bookkeeping */
goto skip_fsfstatus;
}
/* evaluate FSF status in QTCB */
switch (header->fsf_status) {
case FSF_PORT_ALREADY_OPEN:
/*
* This is a bug, however operation should continue normally
* if it is simply ignored
*/
break;
case FSF_ACCESS_DENIED:
zfcp_fsf_access_denied_port(fsf_req, port);
break;
case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The adapter is out of resources. The remote port "
"0x%016Lx could not be opened, disabling it.\n",
port->wwpn);
zfcp_erp_port_failed(port, 31, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* ERP strategy will escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* ERP strategy will escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_NO_RETRY_POSSIBLE:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The remote port 0x%016Lx could not be "
"opened. Disabling it.\n", port->wwpn);
zfcp_erp_port_failed(port, 32, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
default:
break;
}
break;
case FSF_GOOD:
/* save port handle assigned by FSF */
port->handle = header->port_handle;
/* mark port as open */
atomic_set_mask(ZFCP_STATUS_COMMON_OPEN |
ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
ZFCP_STATUS_COMMON_ACCESS_BOXED,
&port->status);
retval = 0;
/* check whether D_ID has changed during open */
/*
* FIXME: This check is not airtight, as the FCP channel does
* not monitor closures of target port connections caused on
* the remote side. Thus, they might miss out on invalidating
* locally cached WWPNs (and other N_Port parameters) of gone
* target ports. So, our heroic attempt to make things safe
* could be undermined by 'open port' response data tagged with
* obsolete WWPNs. Another reason to monitor potential
* connection closures ourself at least (by interpreting
* incoming ELS' and unsolicited status). It just crosses my
* mind that one should be able to cross-check by means of
* another GID_PN straight after a port has been opened.
* Alternately, an ADISC/PDISC ELS should suffice, as well.
*/
plogi = (struct fsf_plogi *) fsf_req->qtcb->bottom.support.els;
if (!atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN, &port->status))
{
if (fsf_req->qtcb->bottom.support.els1_length <
sizeof (struct fsf_plogi)) {
/* skip sanity check and assume wwpn is ok */
} else {
if (plogi->serv_param.wwpn != port->wwpn) {
atomic_clear_mask(
ZFCP_STATUS_PORT_DID_DID,
&port->status);
} else {
port->wwnn = plogi->serv_param.wwnn;
zfcp_fc_plogi_evaluate(port, plogi);
}
}
}
break;
case FSF_UNKNOWN_OP_SUBTYPE:
/* should never occure, subtype not set in zfcp_fsf_open_port */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
default:
break;
}
skip_fsfstatus:
atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &port->status);
return retval;
}
/*
* function: zfcp_fsf_close_port
*
* purpose: submit FSF command "close port"
*
* returns: address of initiated FSF request
* NULL - request could not be initiated
*/
int
zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval = 0;
/* setup new FSF request */
retval = zfcp_fsf_req_create(erp_action->adapter,
FSF_QTCB_CLOSE_PORT,
ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
erp_action->adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->port->status);
fsf_req->data = (unsigned long) erp_action->port;
fsf_req->erp_action = erp_action;
fsf_req->qtcb->header.port_handle = erp_action->port->handle;
fsf_req->erp_action = erp_action;
erp_action->fsf_req = fsf_req;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(fsf_req);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
goto out;
}
out:
write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
return retval;
}
/*
* function: zfcp_fsf_close_port_handler
*
* purpose: is called for finished Close Port FSF command
*
* returns:
*/
static int
zfcp_fsf_close_port_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = -EINVAL;
struct zfcp_port *port;
port = (struct zfcp_port *) fsf_req->data;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
/* don't change port status in our bookkeeping */
goto skip_fsfstatus;
}
/* evaluate FSF status in QTCB */
switch (fsf_req->qtcb->header.fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(port->adapter, 0, 107, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
/* Note: FSF has actually closed the port in this case.
* The status code is just daft. Fingers crossed for a change
*/
retval = 0;
break;
case FSF_GOOD:
zfcp_erp_modify_port_status(port, 33, fsf_req,
ZFCP_STATUS_COMMON_OPEN,
ZFCP_CLEAR);
retval = 0;
break;
}
skip_fsfstatus:
atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &port->status);
return retval;
}
/*
* function: zfcp_fsf_close_physical_port
*
* purpose: submit FSF command "close physical port"
*
* returns: address of initiated FSF request
* NULL - request could not be initiated
*/
int
zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval = 0;
/* setup new FSF request */
retval = zfcp_fsf_req_create(erp_action->adapter,
FSF_QTCB_CLOSE_PHYSICAL_PORT,
ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
erp_action->adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
/* mark port as being closed */
atomic_set_mask(ZFCP_STATUS_PORT_PHYS_CLOSING,
&erp_action->port->status);
/* save a pointer to this port */
fsf_req->data = (unsigned long) erp_action->port;
fsf_req->qtcb->header.port_handle = erp_action->port->handle;
fsf_req->erp_action = erp_action;
erp_action->fsf_req = fsf_req;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(fsf_req);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
goto out;
}
out:
write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
return retval;
}
/*
* function: zfcp_fsf_close_physical_port_handler
*
* purpose: is called for finished Close Physical Port FSF command
*
* returns:
*/
static int
zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = -EINVAL;
struct zfcp_port *port;
struct zfcp_unit *unit;
struct fsf_qtcb_header *header;
port = (struct zfcp_port *) fsf_req->data;
header = &fsf_req->qtcb->header;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
/* don't change port status in our bookkeeping */
goto skip_fsfstatus;
}
/* evaluate FSF status in QTCB */
switch (header->fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(port->adapter, 0, 108, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ACCESS_DENIED:
zfcp_fsf_access_denied_port(fsf_req, port);
break;
case FSF_PORT_BOXED:
zfcp_erp_port_boxed(port, 50, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
ZFCP_STATUS_FSFREQ_RETRY;
/* can't use generic zfcp_erp_modify_port_status because
* ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
list_for_each_entry(unit, &port->unit_list_head, list)
atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
&unit->status);
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* This will now be escalated by ERP */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* ERP strategy will escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_GOOD:
/* can't use generic zfcp_erp_modify_port_status because
* ZFCP_STATUS_COMMON_OPEN must not be reset for the port
*/
atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
list_for_each_entry(unit, &port->unit_list_head, list)
atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
retval = 0;
break;
}
skip_fsfstatus:
atomic_clear_mask(ZFCP_STATUS_PORT_PHYS_CLOSING, &port->status);
return retval;
}
/*
* function: zfcp_fsf_open_unit
*
* purpose:
*
* returns:
*
* assumptions: This routine does not check whether the associated
* remote port has already been opened. This should be
* done by calling routines. Otherwise some status
* may be presented by FSF
*/
int
zfcp_fsf_open_unit(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval = 0;
/* setup new FSF request */
retval = zfcp_fsf_req_create(erp_action->adapter,
FSF_QTCB_OPEN_LUN,
ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
erp_action->adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->qtcb->header.port_handle = erp_action->port->handle;
fsf_req->qtcb->bottom.support.fcp_lun = erp_action->unit->fcp_lun;
if (!(erp_action->adapter->connection_features & FSF_FEATURE_NPIV_MODE))
fsf_req->qtcb->bottom.support.option =
FSF_OPEN_LUN_SUPPRESS_BOXING;
atomic_set_mask(ZFCP_STATUS_COMMON_OPENING, &erp_action->unit->status);
fsf_req->data = (unsigned long) erp_action->unit;
fsf_req->erp_action = erp_action;
erp_action->fsf_req = fsf_req;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(erp_action->fsf_req);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
goto out;
}
out:
write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
return retval;
}
/*
* function: zfcp_fsf_open_unit_handler
*
* purpose: is called for finished Open LUN command
*
* returns:
*/
static int
zfcp_fsf_open_unit_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = -EINVAL;
struct zfcp_adapter *adapter;
struct zfcp_unit *unit;
struct fsf_qtcb_header *header;
struct fsf_qtcb_bottom_support *bottom;
struct fsf_queue_designator *queue_designator;
int exclusive, readwrite;
unit = (struct zfcp_unit *) fsf_req->data;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
/* don't change unit status in our bookkeeping */
goto skip_fsfstatus;
}
adapter = fsf_req->adapter;
header = &fsf_req->qtcb->header;
bottom = &fsf_req->qtcb->bottom.support;
queue_designator = &header->fsf_status_qual.fsf_queue_designator;
atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
ZFCP_STATUS_COMMON_ACCESS_BOXED |
ZFCP_STATUS_UNIT_SHARED |
ZFCP_STATUS_UNIT_READONLY,
&unit->status);
/* evaluate FSF status in QTCB */
switch (header->fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(unit->port->adapter, 0, 109, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_ALREADY_OPEN:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ACCESS_DENIED:
zfcp_fsf_access_denied_unit(fsf_req, unit);
atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
break;
case FSF_PORT_BOXED:
zfcp_erp_port_boxed(unit->port, 51, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
ZFCP_STATUS_FSFREQ_RETRY;
break;
case FSF_LUN_SHARING_VIOLATION:
if (header->fsf_status_qual.word[0] != 0) {
dev_warn(&adapter->ccw_device->dev,
"FCP-LUN 0x%Lx at the remote port "
"with WWPN 0x%Lx "
"connected to the adapter "
"is already in use in LPAR%d, CSS%d.\n",
unit->fcp_lun,
unit->port->wwpn,
queue_designator->hla,
queue_designator->cssid);
} else
zfcp_act_eval_err(adapter,
header->fsf_status_qual.word[2]);
zfcp_erp_unit_access_denied(unit, 60, fsf_req);
atomic_clear_mask(ZFCP_STATUS_UNIT_SHARED, &unit->status);
atomic_clear_mask(ZFCP_STATUS_UNIT_READONLY, &unit->status);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
dev_warn(&fsf_req->adapter->ccw_device->dev,
"The adapter ran out of resources. There is no "
"handle available for unit 0x%016Lx on port 0x%016Lx.",
unit->fcp_lun, unit->port->wwpn);
zfcp_erp_unit_failed(unit, 34, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* Re-establish link to port */
zfcp_test_link(unit->port);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* ERP strategy will escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
}
break;
case FSF_INVALID_COMMAND_OPTION:
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
retval = -EINVAL;
break;
case FSF_GOOD:
/* save LUN handle assigned by FSF */
unit->handle = header->lun_handle;
/* mark unit as open */
atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE) &&
(adapter->adapter_features & FSF_FEATURE_LUN_SHARING) &&
(adapter->ccw_device->id.dev_model != ZFCP_DEVICE_MODEL_PRIV)) {
exclusive = (bottom->lun_access_info &
FSF_UNIT_ACCESS_EXCLUSIVE);
readwrite = (bottom->lun_access_info &
FSF_UNIT_ACCESS_OUTBOUND_TRANSFER);
if (!exclusive)
atomic_set_mask(ZFCP_STATUS_UNIT_SHARED,
&unit->status);
if (!readwrite) {
atomic_set_mask(ZFCP_STATUS_UNIT_READONLY,
&unit->status);
dev_info(&fsf_req->adapter->ccw_device->dev,
"Read-only access for unit 0x%016Lx "
"on port 0x%016Lx.\n",
unit->fcp_lun, unit->port->wwpn);
}
if (exclusive && !readwrite) {
dev_err(&fsf_req->adapter->ccw_device->dev,
"Exclusive access of read-only unit "
"0x%016Lx on port 0x%016Lx not "
"supported, disabling unit.\n",
unit->fcp_lun, unit->port->wwpn);
zfcp_erp_unit_failed(unit, 35, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
zfcp_erp_unit_shutdown(unit, 0, 80, fsf_req);
} else if (!exclusive && readwrite) {
dev_err(&fsf_req->adapter->ccw_device->dev,
"Shared access of read-write unit "
"0x%016Lx on port 0x%016Lx not "
"supported, disabling unit.\n",
unit->fcp_lun, unit->port->wwpn);
zfcp_erp_unit_failed(unit, 36, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
zfcp_erp_unit_shutdown(unit, 0, 81, fsf_req);
}
}
retval = 0;
break;
}
skip_fsfstatus:
atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING, &unit->status);
return retval;
}
/*
* function: zfcp_fsf_close_unit
*
* purpose:
*
* returns: address of fsf_req - request successfully initiated
* NULL -
*
* assumptions: This routine does not check whether the associated
* remote port/lun has already been opened. This should be
* done by calling routines. Otherwise some status
* may be presented by FSF
*/
int
zfcp_fsf_close_unit(struct zfcp_erp_action *erp_action)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req;
unsigned long lock_flags;
int retval = 0;
/* setup new FSF request */
retval = zfcp_fsf_req_create(erp_action->adapter,
FSF_QTCB_CLOSE_LUN,
ZFCP_WAIT_FOR_SBAL | ZFCP_REQ_AUTO_CLEANUP,
erp_action->adapter->pool.fsf_req_erp,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
fsf_req->qtcb->header.port_handle = erp_action->port->handle;
fsf_req->qtcb->header.lun_handle = erp_action->unit->handle;
atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING, &erp_action->unit->status);
fsf_req->data = (unsigned long) erp_action->unit;
fsf_req->erp_action = erp_action;
erp_action->fsf_req = fsf_req;
zfcp_erp_start_timer(fsf_req);
retval = zfcp_fsf_req_send(erp_action->fsf_req);
if (retval) {
zfcp_fsf_req_free(fsf_req);
erp_action->fsf_req = NULL;
goto out;
}
out:
write_unlock_irqrestore(&erp_action->adapter->req_q.lock, lock_flags);
return retval;
}
/*
* function: zfcp_fsf_close_unit_handler
*
* purpose: is called for finished Close LUN FSF command
*
* returns:
*/
static int
zfcp_fsf_close_unit_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = -EINVAL;
struct zfcp_unit *unit;
unit = (struct zfcp_unit *) fsf_req->data;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
/* don't change unit status in our bookkeeping */
goto skip_fsfstatus;
}
/* evaluate FSF status in QTCB */
switch (fsf_req->qtcb->header.fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(unit->port->adapter, 0, 110, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_HANDLE_NOT_VALID:
zfcp_erp_port_reopen(unit->port, 0, 111, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_BOXED:
zfcp_erp_port_boxed(unit->port, 52, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
ZFCP_STATUS_FSFREQ_RETRY;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (fsf_req->qtcb->header.fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* re-establish link to port */
zfcp_test_link(unit->port);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* ERP strategy will escalate */
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
default:
break;
}
break;
case FSF_GOOD:
/* mark unit as closed */
atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status);
retval = 0;
break;
}
skip_fsfstatus:
atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING, &unit->status);
return retval;
}
/**
* zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
* @adapter: adapter where scsi command is issued
* @unit: unit where command is sent to
* @scsi_cmnd: scsi command to be sent
* @timer: timer to be started when request is initiated
* @req_flags: flags for fsf_request
*/
int
zfcp_fsf_send_fcp_command_task(struct zfcp_adapter *adapter,
struct zfcp_unit *unit,
struct scsi_cmnd * scsi_cmnd,
int use_timer, int req_flags)
{
struct zfcp_fsf_req *fsf_req = NULL;
struct fcp_cmnd_iu *fcp_cmnd_iu;
unsigned int sbtype;
unsigned long lock_flags;
int real_bytes = 0;
int retval = 0;
int mask;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
adapter->pool.fsf_req_scsi,
&lock_flags, &fsf_req);
if (unlikely(retval < 0))
goto failed_req_create;
if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&unit->status))) {
retval = -EBUSY;
goto unit_blocked;
}
zfcp_unit_get(unit);
fsf_req->unit = unit;
/* associate FSF request with SCSI request (for look up on abort) */
scsi_cmnd->host_scribble = (unsigned char *) fsf_req->req_id;
/* associate SCSI command with FSF request */
fsf_req->data = (unsigned long) scsi_cmnd;
/* set handles of unit and its parent port in QTCB */
fsf_req->qtcb->header.lun_handle = unit->handle;
fsf_req->qtcb->header.port_handle = unit->port->handle;
/* FSF does not define the structure of the FCP_CMND IU */
fcp_cmnd_iu = (struct fcp_cmnd_iu *)
&(fsf_req->qtcb->bottom.io.fcp_cmnd);
/*
* set depending on data direction:
* data direction bits in SBALE (SB Type)
* data direction bits in QTCB
* data direction bits in FCP_CMND IU
*/
switch (scsi_cmnd->sc_data_direction) {
case DMA_NONE:
fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
/*
* FIXME(qdio):
* what is the correct type for commands
* without 'real' data buffers?
*/
sbtype = SBAL_FLAGS0_TYPE_READ;
break;
case DMA_FROM_DEVICE:
fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
sbtype = SBAL_FLAGS0_TYPE_READ;
fcp_cmnd_iu->rddata = 1;
break;
case DMA_TO_DEVICE:
fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
sbtype = SBAL_FLAGS0_TYPE_WRITE;
fcp_cmnd_iu->wddata = 1;
break;
case DMA_BIDIRECTIONAL:
default:
/*
* dummy, catch this condition earlier
* in zfcp_scsi_queuecommand
*/
goto failed_scsi_cmnd;
}
/* set FC service class in QTCB (3 per default) */
fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
/* set FCP_LUN in FCP_CMND IU in QTCB */
fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
mask = ZFCP_STATUS_UNIT_READONLY | ZFCP_STATUS_UNIT_SHARED;
/* set task attributes in FCP_CMND IU in QTCB */
if (likely((scsi_cmnd->device->simple_tags) ||
(atomic_test_mask(mask, &unit->status))))
fcp_cmnd_iu->task_attribute = SIMPLE_Q;
else
fcp_cmnd_iu->task_attribute = UNTAGGED;
/* set additional length of FCP_CDB in FCP_CMND IU in QTCB, if needed */
if (unlikely(scsi_cmnd->cmd_len > FCP_CDB_LENGTH))
fcp_cmnd_iu->add_fcp_cdb_length
= (scsi_cmnd->cmd_len - FCP_CDB_LENGTH) >> 2;
/*
* copy SCSI CDB (including additional length, if any) to
* FCP_CDB in FCP_CMND IU in QTCB
*/
memcpy(fcp_cmnd_iu->fcp_cdb, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
/* FCP CMND IU length in QTCB */
fsf_req->qtcb->bottom.io.fcp_cmnd_length =
sizeof (struct fcp_cmnd_iu) +
fcp_cmnd_iu->add_fcp_cdb_length + sizeof (fcp_dl_t);
/* generate SBALEs from data buffer */
real_bytes = zfcp_qdio_sbals_from_sg(fsf_req, sbtype,
scsi_sglist(scsi_cmnd),
ZFCP_MAX_SBALS_PER_REQ);
if (unlikely(real_bytes < 0)) {
if (fsf_req->sbal_number < ZFCP_MAX_SBALS_PER_REQ)
retval = -EIO;
else {
dev_err(&adapter->ccw_device->dev,
"SCSI request too large. "
"Shutting down unit 0x%016Lx on port "
"0x%016Lx.\n", unit->fcp_lun,
unit->port->wwpn);
zfcp_erp_unit_shutdown(unit, 0, 131, fsf_req);
retval = -EINVAL;
}
goto no_fit;
}
/* set length of FCP data length in FCP_CMND IU in QTCB */
zfcp_set_fcp_dl(fcp_cmnd_iu, real_bytes);
if (use_timer)
zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
if (unlikely(retval < 0))
goto send_failed;
goto success;
send_failed:
no_fit:
failed_scsi_cmnd:
zfcp_unit_put(unit);
unit_blocked:
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
scsi_cmnd->host_scribble = NULL;
success:
failed_req_create:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return retval;
}
struct zfcp_fsf_req *
zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
struct zfcp_unit *unit,
u8 tm_flags, int req_flags)
{
struct zfcp_fsf_req *fsf_req = NULL;
int retval = 0;
struct fcp_cmnd_iu *fcp_cmnd_iu;
unsigned long lock_flags;
volatile struct qdio_buffer_element *sbale;
/* setup new FSF request */
retval = zfcp_fsf_req_create(adapter, FSF_QTCB_FCP_CMND, req_flags,
adapter->pool.fsf_req_scsi,
&lock_flags, &fsf_req);
if (retval < 0)
goto out;
if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&unit->status)))
goto unit_blocked;
/*
* Used to decide on proper handler in the return path,
* could be either zfcp_fsf_send_fcp_command_task_handler or
* zfcp_fsf_send_fcp_command_task_management_handler */
fsf_req->status |= ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT;
/*
* hold a pointer to the unit being target of this
* task management request
*/
fsf_req->data = (unsigned long) unit;
/* set FSF related fields in QTCB */
fsf_req->qtcb->header.lun_handle = unit->handle;
fsf_req->qtcb->header.port_handle = unit->port->handle;
fsf_req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
fsf_req->qtcb->bottom.io.service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
fsf_req->qtcb->bottom.io.fcp_cmnd_length =
sizeof (struct fcp_cmnd_iu) + sizeof (fcp_dl_t);
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
/* set FCP related fields in FCP_CMND IU in QTCB */
fcp_cmnd_iu = (struct fcp_cmnd_iu *)
&(fsf_req->qtcb->bottom.io.fcp_cmnd);
fcp_cmnd_iu->fcp_lun = unit->fcp_lun;
fcp_cmnd_iu->task_management_flags = tm_flags;
zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
if (!retval)
goto out;
unit_blocked:
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
out:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return fsf_req;
}
static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat)
{
lat_rec->sum += lat;
if (lat_rec->min > lat)
lat_rec->min = lat;
if (lat_rec->max < lat)
lat_rec->max = lat;
}
static void zfcp_fsf_req_latency(struct zfcp_fsf_req *fsf_req)
{
struct fsf_qual_latency_info *lat_inf;
struct latency_cont *lat;
struct zfcp_unit *unit;
unsigned long flags;
lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
unit = fsf_req->unit;
switch (fsf_req->qtcb->bottom.io.data_direction) {
case FSF_DATADIR_READ:
lat = &unit->latencies.read;
break;
case FSF_DATADIR_WRITE:
lat = &unit->latencies.write;
break;
case FSF_DATADIR_CMND:
lat = &unit->latencies.cmd;
break;
default:
return;
}
spin_lock_irqsave(&unit->latencies.lock, flags);
zfcp_fsf_update_lat(&lat->channel, lat_inf->channel_lat);
zfcp_fsf_update_lat(&lat->fabric, lat_inf->fabric_lat);
lat->counter++;
spin_unlock_irqrestore(&unit->latencies.lock, flags);
}
/*
* function: zfcp_fsf_send_fcp_command_handler
*
* purpose: is called for finished Send FCP Command
*
* returns:
*/
static int
zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = -EINVAL;
struct zfcp_unit *unit;
struct fsf_qtcb_header *header;
header = &fsf_req->qtcb->header;
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT))
unit = (struct zfcp_unit *) fsf_req->data;
else
unit = fsf_req->unit;
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
/* go directly to calls of special handlers */
goto skip_fsfstatus;
}
/* evaluate FSF status in QTCB */
switch (header->fsf_status) {
case FSF_PORT_HANDLE_NOT_VALID:
zfcp_erp_adapter_reopen(unit->port->adapter, 0, 112, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_LUN_HANDLE_NOT_VALID:
zfcp_erp_port_reopen(unit->port, 0, 113, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_HANDLE_MISMATCH:
zfcp_erp_adapter_reopen(unit->port->adapter, 0, 114, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_SERVICE_CLASS_NOT_SUPPORTED:
zfcp_fsf_class_not_supp(fsf_req);
break;
case FSF_FCPLUN_NOT_VALID:
zfcp_erp_port_reopen(unit->port, 0, 115, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_ACCESS_DENIED:
zfcp_fsf_access_denied_unit(fsf_req, unit);
break;
case FSF_DIRECTION_INDICATOR_NOT_VALID:
dev_err(&fsf_req->adapter->ccw_device->dev,
"Invalid data direction (%d) given for unit 0x%016Lx "
"on port 0x%016Lx, shutting down adapter.\n",
fsf_req->qtcb->bottom.io.data_direction,
unit->fcp_lun, unit->port->wwpn);
zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 133, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_CMND_LENGTH_NOT_VALID:
dev_err(&fsf_req->adapter->ccw_device->dev,
"An invalid control-data-block length field (%d) "
"was found in a command for unit 0x%016Lx on port "
"0x%016Lx. Shutting down adapter.\n",
fsf_req->qtcb->bottom.io.fcp_cmnd_length,
unit->fcp_lun, unit->port->wwpn);
zfcp_erp_adapter_shutdown(unit->port->adapter, 0, 134, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_PORT_BOXED:
zfcp_erp_port_boxed(unit->port, 53, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR |
ZFCP_STATUS_FSFREQ_RETRY;
break;
case FSF_LUN_BOXED:
zfcp_erp_unit_boxed(unit, 54, fsf_req);
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
| ZFCP_STATUS_FSFREQ_RETRY;
break;
case FSF_ADAPTER_STATUS_AVAILABLE:
switch (header->fsf_status_qual.word[0]) {
case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
/* re-establish link to port */
zfcp_test_link(unit->port);
break;
case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
/* FIXME(hw) need proper specs for proper action */
/* let scsi stack deal with retries and escalation */
break;
}
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
break;
case FSF_GOOD:
break;
case FSF_FCP_RSP_AVAILABLE:
break;
}
skip_fsfstatus:
if (fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT) {
retval =
zfcp_fsf_send_fcp_command_task_management_handler(fsf_req);
} else {
retval = zfcp_fsf_send_fcp_command_task_handler(fsf_req);
fsf_req->unit = NULL;
zfcp_unit_put(unit);
}
return retval;
}
/*
* function: zfcp_fsf_send_fcp_command_task_handler
*
* purpose: evaluates FCP_RSP IU
*
* returns:
*/
static int
zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
struct scsi_cmnd *scpnt;
struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
&(fsf_req->qtcb->bottom.io.fcp_rsp);
u32 sns_len;
char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
unsigned long flags;
read_lock_irqsave(&fsf_req->adapter->abort_lock, flags);
scpnt = (struct scsi_cmnd *) fsf_req->data;
if (unlikely(!scpnt))
goto out;
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTED)) {
/* FIXME: (design) mid-layer should handle DID_ABORT like
* DID_SOFT_ERROR by retrying the request for devices
* that allow retries.
*/
set_host_byte(scpnt, DID_SOFT_ERROR);
set_driver_byte(scpnt, SUGGEST_RETRY);
goto skip_fsfstatus;
}
if (unlikely(fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
}
/* set message byte of result in SCSI command */
set_msg_byte(scpnt, COMMAND_COMPLETE);
/*
* copy SCSI status code of FCP_STATUS of FCP_RSP IU to status byte
* of result in SCSI command
*/
scpnt->result |= fcp_rsp_iu->scsi_status;
if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
zfcp_fsf_req_latency(fsf_req);
/* check FCP_RSP_INFO */
if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
switch (fcp_rsp_info[3]) {
case RSP_CODE_GOOD:
/* ok, continue */
set_host_byte(scpnt, DID_OK);
break;
case RSP_CODE_LENGTH_MISMATCH:
/* hardware bug */
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
case RSP_CODE_FIELD_INVALID:
/* driver or hardware bug */
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
case RSP_CODE_RO_MISMATCH:
/* hardware bug */
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
default:
/* invalid FCP response code */
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
}
}
/* check for sense data */
if (unlikely(fcp_rsp_iu->validity.bits.fcp_sns_len_valid)) {
sns_len = FSF_FCP_RSP_SIZE -
sizeof (struct fcp_rsp_iu) + fcp_rsp_iu->fcp_rsp_len;
sns_len = min(sns_len, (u32) SCSI_SENSE_BUFFERSIZE);
sns_len = min(sns_len, fcp_rsp_iu->fcp_sns_len);
memcpy(scpnt->sense_buffer,
zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu), sns_len);
}
/* check for underrun */
if (unlikely(fcp_rsp_iu->validity.bits.fcp_resid_under)) {
scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
scpnt->underflow)
set_host_byte(scpnt, DID_ERROR);
}
skip_fsfstatus:
if (scpnt->result != 0)
zfcp_scsi_dbf_event_result("erro", 3, fsf_req->adapter, scpnt, fsf_req);
else if (scpnt->retries > 0)
zfcp_scsi_dbf_event_result("retr", 4, fsf_req->adapter, scpnt, fsf_req);
else
zfcp_scsi_dbf_event_result("norm", 6, fsf_req->adapter, scpnt, fsf_req);
/* cleanup pointer (need this especially for abort) */
scpnt->host_scribble = NULL;
/* always call back */
(scpnt->scsi_done) (scpnt);
/*
* We must hold this lock until scsi_done has been called.
* Otherwise we may call scsi_done after abort regarding this
* command has completed.
* Note: scsi_done must not block!
*/
out:
read_unlock_irqrestore(&fsf_req->adapter->abort_lock, flags);
return retval;
}
/*
* function: zfcp_fsf_send_fcp_command_task_management_handler
*
* purpose: evaluates FCP_RSP IU
*
* returns:
*/
static int
zfcp_fsf_send_fcp_command_task_management_handler(struct zfcp_fsf_req *fsf_req)
{
int retval = 0;
struct fcp_rsp_iu *fcp_rsp_iu = (struct fcp_rsp_iu *)
&(fsf_req->qtcb->bottom.io.fcp_rsp);
char *fcp_rsp_info = (unsigned char *) &fcp_rsp_iu[1];
if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
goto skip_fsfstatus;
}
/* check FCP_RSP_INFO */
switch (fcp_rsp_info[3]) {
case RSP_CODE_GOOD:
/* ok, continue */
break;
case RSP_CODE_TASKMAN_UNSUPP:
fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP;
break;
case RSP_CODE_TASKMAN_FAILED:
fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
break;
default:
/* invalid FCP response code */
fsf_req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
}
skip_fsfstatus:
return retval;
}
/*
* function: zfcp_fsf_control_file
*
* purpose: Initiator of the control file upload/download FSF requests
*
* returns: 0 - FSF request is successfuly created and queued
* -EOPNOTSUPP - The FCP adapter does not have Control File support
* -EINVAL - Invalid direction specified
* -ENOMEM - Insufficient memory
* -EPERM - Cannot create FSF request or place it in QDIO queue
*/
struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
struct zfcp_fsf_cfdc *fsf_cfdc)
{
struct zfcp_fsf_req *fsf_req;
struct fsf_qtcb_bottom_support *bottom;
volatile struct qdio_buffer_element *sbale;
unsigned long lock_flags;
int direction;
int retval;
int bytes;
if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
return ERR_PTR(-EOPNOTSUPP);
switch (fsf_cfdc->command) {
case FSF_QTCB_DOWNLOAD_CONTROL_FILE:
direction = SBAL_FLAGS0_TYPE_WRITE;
break;
case FSF_QTCB_UPLOAD_CONTROL_FILE:
direction = SBAL_FLAGS0_TYPE_READ;
break;
default:
return ERR_PTR(-EINVAL);
}
retval = zfcp_fsf_req_create(adapter, fsf_cfdc->command,
ZFCP_WAIT_FOR_SBAL,
NULL, &lock_flags, &fsf_req);
if (retval < 0) {
retval = -EPERM;
goto unlock_queue_lock;
}
sbale = zfcp_qdio_sbale_req(fsf_req);
sbale[0].flags |= direction;
bottom = &fsf_req->qtcb->bottom.support;
bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
bottom->option = fsf_cfdc->option;
bytes = zfcp_qdio_sbals_from_sg(fsf_req, direction,
fsf_cfdc->sg,
ZFCP_MAX_SBALS_PER_REQ);
if (bytes != ZFCP_CFDC_MAX_SIZE) {
retval = -ENOMEM;
goto free_fsf_req;
}
zfcp_fsf_start_timer(fsf_req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
if (retval < 0) {
retval = -EPERM;
goto free_fsf_req;
}
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
wait_event(fsf_req->completion_wq,
fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
return fsf_req;
free_fsf_req:
zfcp_fsf_req_free(fsf_req);
unlock_queue_lock:
write_unlock_irqrestore(&adapter->req_q.lock, lock_flags);
return ERR_PTR(retval);
}
static void zfcp_fsf_control_file_handler(struct zfcp_fsf_req *fsf_req)
{
if (fsf_req->qtcb->header.fsf_status != FSF_GOOD)
fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
}
static inline int
zfcp_fsf_req_sbal_check(unsigned long *flags,
struct zfcp_qdio_queue *queue, int needed)
{
write_lock_irqsave(&queue->lock, *flags);
if (likely(atomic_read(&queue->count) >= needed))
return 1;
write_unlock_irqrestore(&queue->lock, *flags);
return 0;
}
/*
* set qtcb pointer in fsf_req and initialize QTCB
*/
static void
zfcp_fsf_req_qtcb_init(struct zfcp_fsf_req *fsf_req)
{
if (likely(fsf_req->qtcb != NULL)) {
fsf_req->qtcb->prefix.req_seq_no =
fsf_req->adapter->fsf_req_seq_no;
fsf_req->qtcb->prefix.req_id = fsf_req->req_id;
fsf_req->qtcb->prefix.ulp_info = ZFCP_ULP_INFO_VERSION;
fsf_req->qtcb->prefix.qtcb_type =
fsf_qtcb_type[fsf_req->fsf_command];
fsf_req->qtcb->prefix.qtcb_version = ZFCP_QTCB_VERSION;
fsf_req->qtcb->header.req_handle = fsf_req->req_id;
fsf_req->qtcb->header.fsf_command = fsf_req->fsf_command;
}
}
/**
* zfcp_fsf_req_sbal_get - try to get one SBAL in the request queue
* @adapter: adapter for which request queue is examined
* @req_flags: flags indicating whether to wait for needed SBAL or not
* @lock_flags: lock_flags if queue_lock is taken
* Return: 0 on success, otherwise -EIO, or -ERESTARTSYS
* Locks: lock adapter->req_q->lock on success
*/
static int
zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter, int req_flags,
unsigned long *lock_flags)
{
long ret;
struct zfcp_qdio_queue *req_q = &adapter->req_q;
if (unlikely(req_flags & ZFCP_WAIT_FOR_SBAL)) {
ret = wait_event_interruptible_timeout(adapter->request_wq,
zfcp_fsf_req_sbal_check(lock_flags, req_q, 1),
ZFCP_SBAL_TIMEOUT);
if (ret < 0)
return ret;
if (!ret)
return -EIO;
} else if (!zfcp_fsf_req_sbal_check(lock_flags, req_q, 1))
return -EIO;
return 0;
}
/*
* function: zfcp_fsf_req_create
*
* purpose: create an FSF request at the specified adapter and
* setup common fields
*
* returns: -ENOMEM if there was insufficient memory for a request
* -EIO if no qdio buffers could be allocate to the request
* -EINVAL/-EPERM on bug conditions in req_dequeue
* 0 in success
*
* note: The created request is returned by reference.
*
* locks: lock of concerned request queue must not be held,
* but is held on completion (write, irqsave)
*/
int
zfcp_fsf_req_create(struct zfcp_adapter *adapter, u32 fsf_cmd, int req_flags,
mempool_t *pool, unsigned long *lock_flags,
struct zfcp_fsf_req **fsf_req_p)
{
volatile struct qdio_buffer_element *sbale;
struct zfcp_fsf_req *fsf_req = NULL;
int ret = 0;
struct zfcp_qdio_queue *req_q = &adapter->req_q;
/* allocate new FSF request */
fsf_req = zfcp_fsf_req_alloc(pool, req_flags);
if (unlikely(!fsf_req)) {
ret = -ENOMEM;
goto failed_fsf_req;
}
fsf_req->adapter = adapter;
fsf_req->fsf_command = fsf_cmd;
INIT_LIST_HEAD(&fsf_req->list);
init_timer(&fsf_req->timer);
/* initialize waitqueue which may be used to wait on
this request completion */
init_waitqueue_head(&fsf_req->completion_wq);
ret = zfcp_fsf_req_sbal_get(adapter, req_flags, lock_flags);
if (ret < 0)
goto failed_sbals;
/* this is serialized (we are holding req_queue-lock of adapter) */
if (adapter->req_no == 0)
adapter->req_no++;
fsf_req->req_id = adapter->req_no++;
zfcp_fsf_req_qtcb_init(fsf_req);
/*
* We hold queue_lock here. Check if QDIOUP is set and let request fail
* if it is not set (see also *_open_qdio and *_close_qdio).
*/
if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
write_unlock_irqrestore(&req_q->lock, *lock_flags);
ret = -EIO;
goto failed_sbals;
}
if (fsf_req->qtcb) {
fsf_req->seq_no = adapter->fsf_req_seq_no;
fsf_req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
}
fsf_req->sbal_number = 1;
fsf_req->sbal_first = req_q->first;
fsf_req->sbal_last = req_q->first;
fsf_req->sbale_curr = 1;
if (likely(req_flags & ZFCP_REQ_AUTO_CLEANUP)) {
fsf_req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
}
sbale = zfcp_qdio_sbale_req(fsf_req);
/* setup common SBALE fields */
sbale[0].addr = (void *) fsf_req->req_id;
sbale[0].flags |= SBAL_FLAGS0_COMMAND;
if (likely(fsf_req->qtcb != NULL)) {
sbale[1].addr = (void *) fsf_req->qtcb;
sbale[1].length = sizeof(struct fsf_qtcb);
}
goto success;
failed_sbals:
/* dequeue new FSF request previously enqueued */
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
failed_fsf_req:
write_lock_irqsave(&req_q->lock, *lock_flags);
success:
*fsf_req_p = fsf_req;
return ret;
}
/*
* function: zfcp_fsf_req_send
*
* purpose: start transfer of FSF request via QDIO
*
* returns: 0 - request transfer succesfully started
* !0 - start of request transfer failed
*/
static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
{
struct zfcp_adapter *adapter;
struct zfcp_qdio_queue *req_q;
volatile struct qdio_buffer_element *sbale;
int inc_seq_no;
int retval = 0;
adapter = fsf_req->adapter;
req_q = &adapter->req_q;
sbale = zfcp_qdio_sbale_req(fsf_req);
/* put allocated FSF request into hash table */
spin_lock(&adapter->req_list_lock);
zfcp_reqlist_add(adapter, fsf_req);
spin_unlock(&adapter->req_list_lock);
inc_seq_no = (fsf_req->qtcb != NULL);
fsf_req->issued = get_clock();
retval = zfcp_qdio_send(fsf_req);
if (unlikely(retval)) {
/* Queues are down..... */
del_timer(&fsf_req->timer);
spin_lock(&adapter->req_list_lock);
zfcp_reqlist_remove(adapter, fsf_req);
spin_unlock(&adapter->req_list_lock);
/* undo changes in request queue made for this request */
atomic_add(fsf_req->sbal_number, &req_q->count);
req_q->first -= fsf_req->sbal_number;
req_q->first += QDIO_MAX_BUFFERS_PER_Q;
req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
zfcp_erp_adapter_reopen(adapter, 0, 116, fsf_req);
retval = -EIO;
} else {
/*
* increase FSF sequence counter -
* this must only be done for request successfully enqueued to
* QDIO this rejected requests may be cleaned up by calling
* routines resulting in missing sequence counter values
* otherwise,
*/
/* Don't increase for unsolicited status */
if (inc_seq_no)
adapter->fsf_req_seq_no++;
}
return retval;
}
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