diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_fc.c')
-rw-r--r-- | drivers/s390/scsi/zfcp_fc.c | 215 |
1 files changed, 151 insertions, 64 deletions
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c index 44456f7..899e45b 100644 --- a/drivers/s390/scsi/zfcp_fc.c +++ b/drivers/s390/scsi/zfcp_fc.c @@ -39,6 +39,84 @@ struct zfcp_gpn_ft { struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS]; }; +struct zfcp_fc_ns_handler_data { + struct completion done; + void (*handler)(unsigned long); + unsigned long handler_data; +}; + +static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port) +{ + if (mutex_lock_interruptible(&wka_port->mutex)) + return -ERESTARTSYS; + + if (wka_port->status != ZFCP_WKA_PORT_ONLINE) { + wka_port->status = ZFCP_WKA_PORT_OPENING; + if (zfcp_fsf_open_wka_port(wka_port)) + wka_port->status = ZFCP_WKA_PORT_OFFLINE; + } + + mutex_unlock(&wka_port->mutex); + + wait_event_timeout( + wka_port->completion_wq, + wka_port->status == ZFCP_WKA_PORT_ONLINE || + wka_port->status == ZFCP_WKA_PORT_OFFLINE, + HZ >> 1); + + if (wka_port->status == ZFCP_WKA_PORT_ONLINE) { + atomic_inc(&wka_port->refcount); + return 0; + } + return -EIO; +} + +static void zfcp_wka_port_offline(struct work_struct *work) +{ + struct delayed_work *dw = container_of(work, struct delayed_work, work); + struct zfcp_wka_port *wka_port = + container_of(dw, struct zfcp_wka_port, work); + + wait_event(wka_port->completion_wq, + atomic_read(&wka_port->refcount) == 0); + + mutex_lock(&wka_port->mutex); + if ((atomic_read(&wka_port->refcount) != 0) || + (wka_port->status != ZFCP_WKA_PORT_ONLINE)) + goto out; + + wka_port->status = ZFCP_WKA_PORT_CLOSING; + if (zfcp_fsf_close_wka_port(wka_port)) { + wka_port->status = ZFCP_WKA_PORT_OFFLINE; + wake_up(&wka_port->completion_wq); + } +out: + mutex_unlock(&wka_port->mutex); +} + +static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port) +{ + if (atomic_dec_return(&wka_port->refcount) != 0) + return; + /* wait 10 miliseconds, other reqs might pop in */ + schedule_delayed_work(&wka_port->work, HZ / 100); +} + +void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter) +{ + struct zfcp_wka_port *wka_port = &adapter->nsp; + + init_waitqueue_head(&wka_port->completion_wq); + + wka_port->adapter = adapter; + wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE; + + wka_port->status = ZFCP_WKA_PORT_OFFLINE; + atomic_set(&wka_port->refcount, 0); + mutex_init(&wka_port->mutex); + INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline); +} + static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, struct fcp_rscn_element *elem) { @@ -47,9 +125,6 @@ static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, read_lock_irqsave(&zfcp_data.config_lock, flags); list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) { - if ((atomic_read(&port->status) & ZFCP_STATUS_PORT_WKA) == - ZFCP_STATUS_PORT_WKA) - continue; /* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */ if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_DID_DID)) /* Try to connect to unused ports anyway. */ @@ -158,7 +233,18 @@ void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) zfcp_fc_incoming_rscn(fsf_req); } -static void zfcp_ns_gid_pn_handler(unsigned long data) +static void zfcp_fc_ns_handler(unsigned long data) +{ + struct zfcp_fc_ns_handler_data *compl_rec = + (struct zfcp_fc_ns_handler_data *) data; + + if (compl_rec->handler) + compl_rec->handler(compl_rec->handler_data); + + complete(&compl_rec->done); +} + +static void zfcp_fc_ns_gid_pn_eval(unsigned long data) { struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data; struct zfcp_send_ct *ct = &gid_pn->ct; @@ -167,43 +253,31 @@ static void zfcp_ns_gid_pn_handler(unsigned long data) struct zfcp_port *port = gid_pn->port; if (ct->status) - goto out; + return; if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) { atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status); - goto out; + return; } /* paranoia */ if (ct_iu_req->wwpn != port->wwpn) - goto out; + return; /* looks like a valid d_id */ port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK; atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status); -out: - mempool_free(gid_pn, port->adapter->pool.data_gid_pn); } -/** - * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request - * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed - * return: -ENOMEM on error, 0 otherwise - */ -int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action) +int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action, + struct zfcp_gid_pn_data *gid_pn) { - int ret; - struct zfcp_gid_pn_data *gid_pn; struct zfcp_adapter *adapter = erp_action->adapter; - - gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC); - if (!gid_pn) - return -ENOMEM; - - memset(gid_pn, 0, sizeof(*gid_pn)); + struct zfcp_fc_ns_handler_data compl_rec; + int ret; /* setup parameters for send generic command */ gid_pn->port = erp_action->port; - gid_pn->ct.port = adapter->nameserver_port; - gid_pn->ct.handler = zfcp_ns_gid_pn_handler; - gid_pn->ct.handler_data = (unsigned long) gid_pn; + gid_pn->ct.wka_port = &adapter->nsp; + gid_pn->ct.handler = zfcp_fc_ns_handler; + gid_pn->ct.handler_data = (unsigned long) &compl_rec; gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT; gid_pn->ct.req = &gid_pn->req; gid_pn->ct.resp = &gid_pn->resp; @@ -223,10 +297,42 @@ int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action) gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE; gid_pn->ct_iu_req.wwpn = erp_action->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.fsf_req_erp, erp_action); + if (!ret) + wait_for_completion(&compl_rec.done); + return ret; +} + +/** + * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request + * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed + * return: -ENOMEM on error, 0 otherwise + */ +int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action) +{ + int ret; + struct zfcp_gid_pn_data *gid_pn; + struct zfcp_adapter *adapter = erp_action->adapter; + + gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC); + if (!gid_pn) + return -ENOMEM; + + memset(gid_pn, 0, sizeof(*gid_pn)); + + ret = zfcp_wka_port_get(&adapter->nsp); if (ret) - mempool_free(gid_pn, adapter->pool.data_gid_pn); + goto out; + + ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn); + + zfcp_wka_port_put(&adapter->nsp); +out: + mempool_free(gid_pn, adapter->pool.data_gid_pn); return ret; } @@ -339,30 +445,6 @@ void zfcp_test_link(struct zfcp_port *port) zfcp_erp_port_forced_reopen(port, 0, 65, NULL); } -static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter) -{ - int ret; - - if (!adapter->nameserver_port) - return -EINTR; - - if (!(atomic_read(&adapter->nameserver_port->status) & - ZFCP_STATUS_COMMON_UNBLOCKED)) { - ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148, - NULL); - if (ret) - return ret; - zfcp_erp_wait(adapter); - } - return !(atomic_read(&adapter->nameserver_port->status) & - ZFCP_STATUS_COMMON_UNBLOCKED); -} - -static void zfcp_gpn_ft_handler(unsigned long _done) -{ - complete((struct completion *)_done); -} - static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft) { struct scatterlist *sg = &gpn_ft->sg_req; @@ -404,7 +486,7 @@ static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft, { struct zfcp_send_ct *ct = &gpn_ft->ct; struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req); - struct completion done; + struct zfcp_fc_ns_handler_data compl_rec; int ret; /* prepare CT IU for GPN_FT */ @@ -421,19 +503,20 @@ static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft, req->fc4_type = ZFCP_CT_SCSI_FCP; /* prepare zfcp_send_ct */ - ct->port = adapter->nameserver_port; - ct->handler = zfcp_gpn_ft_handler; - ct->handler_data = (unsigned long)&done; + ct->wka_port = &adapter->nsp; + ct->handler = zfcp_fc_ns_handler; + ct->handler_data = (unsigned long)&compl_rec; ct->timeout = 10; ct->req = &gpn_ft->sg_req; ct->resp = gpn_ft->sg_resp; ct->req_count = 1; ct->resp_count = ZFCP_GPN_FT_BUFFERS; - init_completion(&done); + init_completion(&compl_rec.done); + compl_rec.handler = NULL; ret = zfcp_fsf_send_ct(ct, NULL, NULL); if (!ret) - wait_for_completion(&done); + wait_for_completion(&compl_rec.done); return ret; } @@ -443,8 +526,6 @@ static void zfcp_validate_port(struct zfcp_port *port) atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status); - if (port == adapter->nameserver_port) - return; if ((port->supported_classes != 0) || (port->units != 0)) { zfcp_port_put(port); return; @@ -461,7 +542,7 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft) struct scatterlist *sg = gpn_ft->sg_resp; struct ct_hdr *hdr = sg_virt(sg); struct gpn_ft_resp_acc *acc = sg_virt(sg); - struct zfcp_adapter *adapter = ct->port->adapter; + struct zfcp_adapter *adapter = ct->wka_port->adapter; struct zfcp_port *port, *tmp; u32 d_id; int ret = 0, x, last = 0; @@ -491,6 +572,9 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft) d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 | acc->port_id[2]; + /* don't attach ports with a well known address */ + if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA) + continue; /* skip the adapter's port and known remote ports */ if (acc->wwpn == fc_host_port_name(adapter->scsi_host)) continue; @@ -529,13 +613,15 @@ int zfcp_scan_ports(struct zfcp_adapter *adapter) if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT) return 0; - ret = zfcp_scan_get_nameserver(adapter); + ret = zfcp_wka_port_get(&adapter->nsp); if (ret) return ret; gpn_ft = zfcp_alloc_sg_env(); - if (!gpn_ft) - return -ENOMEM; + if (!gpn_ft) { + ret = -ENOMEM; + goto out; + } for (i = 0; i < 3; i++) { ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter); @@ -548,7 +634,8 @@ int zfcp_scan_ports(struct zfcp_adapter *adapter) } } zfcp_free_sg_env(gpn_ft); - +out: + zfcp_wka_port_put(&adapter->nsp); return ret; } |