Commit 43f60cbd authored by Steffen Maier's avatar Steffen Maier Committed by James Bottomley
Browse files

[SCSI] zfcp: No automatic port_rescan on events 



In FC fabrics with large zones, the automatic port_rescan on incoming ELS
and any adapter recovery can cause quite some traffic at the very same
time, especially if lots of Linux images share an HBA, which is common on
s390. This can cause trouble and failures. Fix this by making such port
rescans dependent on a user configurable module parameter.

The following unconditional automatic port rescans remain as is:
On setting an adapter online and
on manual user-triggered writes to the sysfs attribute port_rescan.

Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent d99b601b

drivers/s390/scsi/zfcp_ccw.c

+6 −1
Original line number Diff line number Diff line
@@ -57,7 +57,7 @@ static int zfcp_ccw_activate(struct ccw_device *cdev, int clear, char *tag) 
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,

				tag);

	zfcp_erp_wait(adapter);

	flush_work(&adapter->scan_work);

	flush_work(&adapter->scan_work); /* ok to call even if nothing queued */



	zfcp_ccw_adapter_put(adapter);
@@ -171,6 +171,11 @@ static int zfcp_ccw_set_online(struct ccw_device *cdev) 
	adapter->req_no = 0;



	zfcp_ccw_activate(cdev, 0, "ccsonl1");

	/* scan for remote ports

	   either at the end of any successful adapter recovery

	   or only after the adapter recovery for setting a device online */

	zfcp_fc_inverse_conditional_port_scan(adapter);

	flush_work(&adapter->scan_work); /* ok to call even if nothing queued */

	zfcp_ccw_adapter_put(adapter);

	return 0;

}

drivers/s390/scsi/zfcp_erp.c

+1 −1
Original line number Diff line number Diff line
@@ -1230,7 +1230,7 @@ static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result) 
	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:

		if (result == ZFCP_ERP_SUCCEEDED) {

			register_service_level(&adapter->service_level);

			queue_work(adapter->work_queue, &adapter->scan_work);

			zfcp_fc_conditional_port_scan(adapter);

			queue_work(adapter->work_queue, &adapter->ns_up_work);

		} else

			unregister_service_level(&adapter->service_level);

drivers/s390/scsi/zfcp_ext.h

+2 −0
Original line number Diff line number Diff line
@@ -99,6 +99,8 @@ extern void zfcp_fc_gs_destroy(struct zfcp_adapter *); 
extern int zfcp_fc_exec_bsg_job(struct fc_bsg_job *);

extern int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *);

extern void zfcp_fc_sym_name_update(struct work_struct *);

extern void zfcp_fc_conditional_port_scan(struct zfcp_adapter *);

extern void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *);



/* zfcp_fsf.c */

extern struct kmem_cache *zfcp_fsf_qtcb_cache;

drivers/s390/scsi/zfcp_fc.c

+22 −1
Original line number Diff line number Diff line
@@ -26,6 +26,27 @@ static u32 zfcp_fc_rscn_range_mask[] = { 
	[ELS_ADDR_FMT_FAB]		= 0x000000,

};



static bool no_auto_port_rescan;

module_param_named(no_auto_port_rescan, no_auto_port_rescan, bool, 0600);

MODULE_PARM_DESC(no_auto_port_rescan,

		 "no automatic port_rescan (default off)");



void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)

{

	if (no_auto_port_rescan)

		return;



	queue_work(adapter->work_queue, &adapter->scan_work);

}



void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)

{

	if (!no_auto_port_rescan)

		return;



	queue_work(adapter->work_queue, &adapter->scan_work);

}



/**

 * zfcp_fc_post_event - post event to userspace via fc_transport

 * @work: work struct with enqueued events
@@ -206,7 +227,7 @@ static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) 
		zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,

				      *(u32 *)page);

	}

	queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);

	zfcp_fc_conditional_port_scan(fsf_req->adapter);

}



static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)

drivers/s390/scsi/zfcp_fsf.c

+1 −1
Original line number Diff line number Diff line
@@ -257,7 +257,7 @@ static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req) 
		if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_ACT_UPDATED)

			zfcp_cfdc_adapter_access_changed(adapter);

		if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)

			queue_work(adapter->work_queue, &adapter->scan_work);

			zfcp_fc_conditional_port_scan(adapter);

		break;

	case FSF_STATUS_READ_CFDC_UPDATED:

		zfcp_cfdc_adapter_access_changed(adapter);

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