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[SCSI] zfcp: Decouple gid_pn requests from erp 

Don't let the erp wait for gid_pn requests to complete. Instead, queue
the gid_pn work, exit erp and let the finished gid_pn work trigger a
new port reopen.

Reviewed-by: Swen Schillig <swen@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:
Christof Schmitt 2009-08-18 15:43:20 +02:00 committed by James Bottomley
parent 564e1c86c8
commit 799b76d09a
6 changed files with 47 additions and 56 deletions
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9
drivers/s390/scsi/zfcp_aux.c
View File

@ -362,6 +362,11 @@ static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
if (!adapter->pool.erp_req)
return -ENOMEM;
adapter->pool.gid_pn_req =
mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
if (!adapter->pool.gid_pn_req)
return -ENOMEM;
adapter->pool.scsi_req =
mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
if (!adapter->pool.scsi_req)
@ -379,7 +384,7 @@ static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
return -ENOMEM;
adapter->pool.qtcb_pool =
mempool_create_slab_pool(3, zfcp_data.qtcb_cache);
mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
if (!adapter->pool.qtcb_pool)
return -ENOMEM;
@ -652,7 +657,7 @@ struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
init_waitqueue_head(&port->remove_wq);
INIT_LIST_HEAD(&port->unit_list_head);
INIT_WORK(&port->gid_pn_work, zfcp_erp_port_strategy_open_lookup);
INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);

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

@ -265,6 +265,7 @@ struct zfcp_fsf_req;
/* holds various memory pools of an adapter */
struct zfcp_adapter_mempool {
mempool_t *erp_req;
mempool_t *gid_pn_req;
mempool_t *scsi_req;
mempool_t *scsi_abort;
mempool_t *status_read_req;

28
drivers/s390/scsi/zfcp_erp.c
View File

@ -26,7 +26,6 @@ enum zfcp_erp_steps {
ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
ZFCP_ERP_STEP_UNIT_CLOSING = 0x1000,
ZFCP_ERP_STEP_UNIT_OPENING = 0x2000,
@ -842,27 +841,6 @@ static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
return zfcp_erp_port_strategy_open_port(act);
}
void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
{
int retval;
struct zfcp_port *port = container_of(work, struct zfcp_port,
gid_pn_work);
retval = zfcp_fc_ns_gid_pn(&port->erp_action);
if (!retval) {
port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
goto out;
}
if (retval == -ENOMEM) {
zfcp_erp_notify(&port->erp_action, ZFCP_STATUS_ERP_LOWMEM);
goto out;
}
/* all other error condtions */
zfcp_erp_notify(&port->erp_action, 0);
out:
zfcp_port_put(port);
}
static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
@ -880,12 +858,8 @@ static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
if (!queue_work(adapter->work_queue,
&port->gid_pn_work))
zfcp_port_put(port);
return ZFCP_ERP_CONTINUES;
return ZFCP_ERP_EXIT;
}
/* fall through */
case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
if (!port->d_id)
return ZFCP_ERP_FAILED;
return zfcp_erp_port_strategy_open_port(act);
case ZFCP_ERP_STEP_PORT_OPENING:

6
drivers/s390/scsi/zfcp_ext.h
View File

@ -94,13 +94,12 @@ extern void zfcp_erp_unit_access_denied(struct zfcp_unit *, char *, void *);
extern void zfcp_erp_adapter_access_changed(struct zfcp_adapter *, char *,
void *);
extern void zfcp_erp_timeout_handler(unsigned long);
extern void zfcp_erp_port_strategy_open_lookup(struct work_struct *);
/* zfcp_fc.c */
extern int zfcp_scan_ports(struct zfcp_adapter *);
extern void _zfcp_scan_ports_later(struct work_struct *);
extern void zfcp_fc_incoming_els(struct zfcp_fsf_req *);
extern int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *);
extern void zfcp_fc_port_did_lookup(struct work_struct *);
extern void zfcp_fc_plogi_evaluate(struct zfcp_port *, struct fsf_plogi *);
extern void zfcp_test_link(struct zfcp_port *);
extern void zfcp_fc_link_test_work(struct work_struct *);
@ -128,8 +127,7 @@ extern struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *,
extern void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *);
extern int zfcp_fsf_status_read(struct zfcp_qdio *);
extern int zfcp_status_read_refill(struct zfcp_adapter *adapter);
extern int zfcp_fsf_send_ct(struct zfcp_send_ct *, mempool_t *,
struct zfcp_erp_action *);
extern int zfcp_fsf_send_ct(struct zfcp_send_ct *, mempool_t *);
extern int zfcp_fsf_send_els(struct zfcp_send_els *);
extern int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *,
struct scsi_cmnd *);

45
drivers/s390/scsi/zfcp_fc.c
View File

@ -282,15 +282,15 @@ static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
}
int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
struct zfcp_gid_pn_data *gid_pn)
{
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_adapter *adapter = port->adapter;
struct zfcp_fc_ns_handler_data compl_rec;
int ret;
/* setup parameters for send generic command */
gid_pn->port = erp_action->port;
gid_pn->port = port;
gid_pn->ct.wka_port = &adapter->gs->ds;
gid_pn->ct.handler = zfcp_fc_ns_handler;
gid_pn->ct.handler_data = (unsigned long) &compl_rec;
@ -309,12 +309,12 @@ int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
gid_pn->ct_iu_req.wwpn = port->wwpn;
init_completion(&compl_rec.done);
compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
compl_rec.handler_data = (unsigned long) gid_pn;
ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.erp_req, erp_action);
ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.gid_pn_req);
if (!ret)
wait_for_completion(&compl_rec.done);
return ret;
@ -322,14 +322,14 @@ int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
/**
* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
* @port: port where GID_PN request is needed
* return: -ENOMEM on error, 0 otherwise
*/
int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
{
int ret;
struct zfcp_gid_pn_data *gid_pn;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_adapter *adapter = port->adapter;
gid_pn = mempool_alloc(adapter->pool.gid_pn_data, GFP_ATOMIC);
if (!gid_pn)
@ -341,7 +341,7 @@ int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
if (ret)
goto out;
ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
ret = zfcp_fc_ns_gid_pn_request(port, gid_pn);
zfcp_wka_port_put(&adapter->gs->ds);
out:
@ -349,6 +349,29 @@ out:
return ret;
}
void zfcp_fc_port_did_lookup(struct work_struct *work)
{
int ret;
struct zfcp_port *port = container_of(work, struct zfcp_port,
gid_pn_work);
ret = zfcp_fc_ns_gid_pn(port);
if (ret) {
/* could not issue gid_pn for some reason */
zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1", NULL);
goto out;
}
if (!port->d_id) {
zfcp_erp_port_failed(port, "fcgpn_2", NULL);
goto out;
}
zfcp_erp_port_reopen(port, 0, "fcgpn_3", NULL);
out:
zfcp_port_put(port);
}
/**
* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
* @port: zfcp_port structure
@ -551,7 +574,7 @@ static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
init_completion(&compl_rec.done);
compl_rec.handler = NULL;
ret = zfcp_fsf_send_ct(ct, NULL, NULL);
ret = zfcp_fsf_send_ct(ct, NULL);
if (!ret)
wait_for_completion(&compl_rec.done);
return ret;
@ -840,7 +863,7 @@ int zfcp_fc_execute_ct_fc_job(struct fc_bsg_job *job)
ct_fc_job->ct.completion = NULL;
ct_fc_job->job = job;
ret = zfcp_fsf_send_ct(&ct_fc_job->ct, NULL, NULL);
ret = zfcp_fsf_send_ct(&ct_fc_job->ct, NULL);
if (ret) {
kfree(ct_fc_job);
zfcp_wka_port_put(ct_fc_job->ct.wka_port);

14
drivers/s390/scsi/zfcp_fsf.c
View File

@ -1069,10 +1069,8 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
* zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
* @ct: pointer to struct zfcp_send_ct with data for request
* @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
* @erp_action: if non-null the Generic Service request sent within ERP
*/
int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
struct zfcp_erp_action *erp_action)
int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool)
{
struct zfcp_wka_port *wka_port = ct->wka_port;
struct zfcp_qdio *qdio = wka_port->adapter->qdio;
@ -1103,13 +1101,7 @@ int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
req->data = ct;
zfcp_san_dbf_event_ct_request(req);
if (erp_action) {
erp_action->fsf_req = req;
req->erp_action = erp_action;
zfcp_fsf_start_erp_timer(req);
} else
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
ret = zfcp_fsf_req_send(req);
if (ret)
@ -1119,8 +1111,6 @@ int zfcp_fsf_send_ct(struct zfcp_send_ct *ct, mempool_t *pool,
failed_send:
zfcp_fsf_req_free(req);
if (erp_action)
erp_action->fsf_req = NULL;
out:
spin_unlock_bh(&qdio->req_q_lock);
return ret;