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[SCSI] zfcp: Post events through FC transport class

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Post FC transport class netlink events for usage in the userspace,
e.g. for HBAAPI. Supported events are those required for the
polled events in HBAAPI.
- link up
- link down
- incoming RSCN
(events related to FC-AL are not supported, as zfcp has no support for FC-AL)

Signed-off-by: Sven Schuetz <sven@linux.vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Sven Schuetz 2010-07-16 15:37:39 +02:00 committed by James Bottomley
parent 706eca49a0
commit 2d1e547f75
6 changed files with 90 additions and 0 deletions
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4
drivers/s390/scsi/zfcp_aux.c
View file

@ -524,6 +524,10 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
rwlock_init(&adapter->port_list_lock);
INIT_LIST_HEAD(&adapter->port_list);
INIT_LIST_HEAD(&adapter->events.list);
INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
spin_lock_init(&adapter->events.list_lock);
init_waitqueue_head(&adapter->erp_ready_wq);
init_waitqueue_head(&adapter->erp_done_wqh);

2
drivers/s390/scsi/zfcp_def.h
View file

@ -37,6 +37,7 @@
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
#include "zfcp_fsf.h"
#include "zfcp_fc.h"
#include "zfcp_qdio.h"
struct zfcp_reqlist;
@ -190,6 +191,7 @@ struct zfcp_adapter {
struct service_level service_level;
struct workqueue_struct *work_queue;
struct device_dma_parameters dma_parms;
struct zfcp_fc_events events;
};
struct zfcp_port {

3
drivers/s390/scsi/zfcp_ext.h
View file

@ -96,6 +96,9 @@ extern void zfcp_erp_adapter_access_changed(struct zfcp_adapter *, char *,
extern void zfcp_erp_timeout_handler(unsigned long);
/* zfcp_fc.c */
extern void zfcp_fc_enqueue_event(struct zfcp_adapter *,
enum fc_host_event_code event_code, u32);
extern void zfcp_fc_post_event(struct work_struct *);
extern void zfcp_fc_scan_ports(struct work_struct *);
extern void zfcp_fc_incoming_els(struct zfcp_fsf_req *);
extern void zfcp_fc_port_did_lookup(struct work_struct *);

54
drivers/s390/scsi/zfcp_fc.c
View file

@ -23,6 +23,58 @@ static u32 zfcp_fc_rscn_range_mask[] = {
[ELS_ADDR_FMT_FAB] = 0x000000,
};
/**
* zfcp_fc_post_event - post event to userspace via fc_transport
* @work: work struct with enqueued events
*/
void zfcp_fc_post_event(struct work_struct *work)
{
struct zfcp_fc_event *event = NULL, *tmp = NULL;
LIST_HEAD(tmp_lh);
struct zfcp_fc_events *events = container_of(work,
struct zfcp_fc_events, work);
struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
events);
spin_lock_bh(&events->list_lock);
list_splice_init(&events->list, &tmp_lh);
spin_unlock_bh(&events->list_lock);
list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
event->code, event->data);
list_del(&event->list);
kfree(event);
}
}
/**
* zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
* @adapter: The adapter where to enqueue the event
* @event_code: The event code (as defined in fc_host_event_code in
* scsi_transport_fc.h)
* @event_data: The event data (e.g. n_port page in case of els)
*/
void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
enum fc_host_event_code event_code, u32 event_data)
{
struct zfcp_fc_event *event;
event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
if (!event)
return;
event->code = event_code;
event->data = event_data;
spin_lock(&adapter->events.list_lock);
list_add_tail(&event->list, &adapter->events.list);
spin_unlock(&adapter->events.list_lock);
queue_work(adapter->work_queue, &adapter->events.work);
}
static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
{
if (mutex_lock_interruptible(&wka_port->mutex))
@ -148,6 +200,8 @@ static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
_zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
page);
zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
*(u32 *)page);
}
queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);
}

24
drivers/s390/scsi/zfcp_fc.h
View file

@ -29,6 +29,30 @@
#define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000)
/**
* struct zfcp_fc_event - FC HBAAPI event for internal queueing from irq context
* @code: Event code
* @data: Event data
* @list: list_head for zfcp_fc_events list
*/
struct zfcp_fc_event {
enum fc_host_event_code code;
u32 data;
struct list_head list;
};
/**
* struct zfcp_fc_events - Infrastructure for posting FC events from irq context
* @list: List for queueing of events from irq context to workqueue
* @list_lock: Lock for event list
* @work: work_struct for forwarding events in workqueue
*/
struct zfcp_fc_events {
struct list_head list;
spinlock_t list_lock;
struct work_struct work;
};
/**
* struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request
* @ct_hdr: FC GS common transport header

3
drivers/s390/scsi/zfcp_fsf.c
View file

@ -274,6 +274,7 @@ static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
break;
case FSF_STATUS_READ_LINK_DOWN:
zfcp_fsf_status_read_link_down(req);
zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKDOWN, 0);
break;
case FSF_STATUS_READ_LINK_UP:
dev_info(&adapter->ccw_device->dev,
@ -286,6 +287,8 @@ static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
ZFCP_STATUS_COMMON_ERP_FAILED,
"fssrh_2", req);
zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKUP, 0);
break;
case FSF_STATUS_READ_NOTIFICATION_LOST:
if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)