| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * zfcp device driver |
| * |
| * Fibre Channel related functions for the zfcp device driver. |
| * |
| * Copyright IBM Corp. 2008, 2017 |
| */ |
| |
| #define KMSG_COMPONENT "zfcp" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/utsname.h> |
| #include <linux/random.h> |
| #include <linux/bsg-lib.h> |
| #include <scsi/fc/fc_els.h> |
| #include <scsi/libfc.h> |
| #include "zfcp_ext.h" |
| #include "zfcp_fc.h" |
| |
| struct kmem_cache *zfcp_fc_req_cache; |
| |
| static u32 zfcp_fc_rscn_range_mask[] = { |
| [ELS_ADDR_FMT_PORT] = 0xFFFFFF, |
| [ELS_ADDR_FMT_AREA] = 0xFFFF00, |
| [ELS_ADDR_FMT_DOM] = 0xFF0000, |
| [ELS_ADDR_FMT_FAB] = 0x000000, |
| }; |
| |
| static bool no_auto_port_rescan; |
| module_param(no_auto_port_rescan, bool, 0600); |
| MODULE_PARM_DESC(no_auto_port_rescan, |
| "no automatic port_rescan (default off)"); |
| |
| static unsigned int port_scan_backoff = 500; |
| module_param(port_scan_backoff, uint, 0600); |
| MODULE_PARM_DESC(port_scan_backoff, |
| "upper limit of port scan random backoff in msecs (default 500)"); |
| |
| static unsigned int port_scan_ratelimit = 60000; |
| module_param(port_scan_ratelimit, uint, 0600); |
| MODULE_PARM_DESC(port_scan_ratelimit, |
| "minimum interval between port scans in msecs (default 60000)"); |
| |
| unsigned int zfcp_fc_port_scan_backoff(void) |
| { |
| if (!port_scan_backoff) |
| return 0; |
| return get_random_int() % port_scan_backoff; |
| } |
| |
| static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter) |
| { |
| unsigned long interval = msecs_to_jiffies(port_scan_ratelimit); |
| unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff()); |
| |
| adapter->next_port_scan = jiffies + interval + backoff; |
| } |
| |
| static void zfcp_fc_port_scan(struct zfcp_adapter *adapter) |
| { |
| unsigned long now = jiffies; |
| unsigned long next = adapter->next_port_scan; |
| unsigned long delay = 0, max; |
| |
| /* delay only needed within waiting period */ |
| if (time_before(now, next)) { |
| delay = next - now; |
| /* paranoia: never ever delay scans longer than specified */ |
| max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff); |
| delay = min(delay, max); |
| } |
| |
| queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay); |
| } |
| |
| void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) |
| { |
| if (no_auto_port_rescan) |
| return; |
| |
| zfcp_fc_port_scan(adapter); |
| } |
| |
| void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) |
| { |
| if (!no_auto_port_rescan) |
| return; |
| |
| zfcp_fc_port_scan(adapter); |
| } |
| |
| /** |
| * 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) |
| { |
| int ret = -EIO; |
| |
| if (mutex_lock_interruptible(&wka_port->mutex)) |
| return -ERESTARTSYS; |
| |
| if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || |
| wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { |
| wka_port->status = ZFCP_FC_WKA_PORT_OPENING; |
| if (zfcp_fsf_open_wka_port(wka_port)) { |
| /* could not even send request, nothing to wait for */ |
| wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| goto out; |
| } |
| } |
| |
| wait_event(wka_port->opened, |
| wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || |
| wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); |
| |
| if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { |
| atomic_inc(&wka_port->refcount); |
| ret = 0; |
| goto out; |
| } |
| out: |
| mutex_unlock(&wka_port->mutex); |
| return ret; |
| } |
| |
| static void zfcp_fc_wka_port_offline(struct work_struct *work) |
| { |
| struct delayed_work *dw = to_delayed_work(work); |
| struct zfcp_fc_wka_port *wka_port = |
| container_of(dw, struct zfcp_fc_wka_port, work); |
| |
| mutex_lock(&wka_port->mutex); |
| if ((atomic_read(&wka_port->refcount) != 0) || |
| (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) |
| goto out; |
| |
| wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; |
| if (zfcp_fsf_close_wka_port(wka_port)) { |
| /* could not even send request, nothing to wait for */ |
| wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| goto out; |
| } |
| wait_event(wka_port->closed, |
| wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); |
| out: |
| mutex_unlock(&wka_port->mutex); |
| } |
| |
| static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) |
| { |
| if (atomic_dec_return(&wka_port->refcount) != 0) |
| return; |
| /* wait 10 milliseconds, other reqs might pop in */ |
| queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work, |
| msecs_to_jiffies(10)); |
| } |
| |
| static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, |
| struct zfcp_adapter *adapter) |
| { |
| init_waitqueue_head(&wka_port->opened); |
| init_waitqueue_head(&wka_port->closed); |
| |
| wka_port->adapter = adapter; |
| wka_port->d_id = d_id; |
| |
| wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| atomic_set(&wka_port->refcount, 0); |
| mutex_init(&wka_port->mutex); |
| INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); |
| } |
| |
| static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) |
| { |
| cancel_delayed_work_sync(&wka->work); |
| mutex_lock(&wka->mutex); |
| wka->status = ZFCP_FC_WKA_PORT_OFFLINE; |
| mutex_unlock(&wka->mutex); |
| } |
| |
| void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) |
| { |
| if (!gs) |
| return; |
| zfcp_fc_wka_port_force_offline(&gs->ms); |
| zfcp_fc_wka_port_force_offline(&gs->ts); |
| zfcp_fc_wka_port_force_offline(&gs->ds); |
| zfcp_fc_wka_port_force_offline(&gs->as); |
| } |
| |
| static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, |
| struct fc_els_rscn_page *page) |
| { |
| unsigned long flags; |
| struct zfcp_adapter *adapter = fsf_req->adapter; |
| struct zfcp_port *port; |
| |
| read_lock_irqsave(&adapter->port_list_lock, flags); |
| list_for_each_entry(port, &adapter->port_list, list) { |
| if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) |
| zfcp_fc_test_link(port); |
| } |
| read_unlock_irqrestore(&adapter->port_list_lock, flags); |
| } |
| |
| static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) |
| { |
| struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; |
| struct zfcp_adapter *adapter = fsf_req->adapter; |
| struct fc_els_rscn *head; |
| struct fc_els_rscn_page *page; |
| u16 i; |
| u16 no_entries; |
| unsigned int afmt; |
| |
| head = (struct fc_els_rscn *) status_buffer->payload.data; |
| page = (struct fc_els_rscn_page *) head; |
| |
| /* see FC-FS */ |
| no_entries = be16_to_cpu(head->rscn_plen) / |
| sizeof(struct fc_els_rscn_page); |
| |
| if (no_entries > 1) { |
| /* handle failed ports */ |
| unsigned long flags; |
| struct zfcp_port *port; |
| |
| read_lock_irqsave(&adapter->port_list_lock, flags); |
| list_for_each_entry(port, &adapter->port_list, list) { |
| if (port->d_id) |
| continue; |
| zfcp_erp_port_reopen(port, |
| ZFCP_STATUS_COMMON_ERP_FAILED, |
| "fcrscn1"); |
| } |
| read_unlock_irqrestore(&adapter->port_list_lock, flags); |
| } |
| |
| for (i = 1; i < no_entries; i++) { |
| /* skip head and start with 1st element */ |
| page++; |
| 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); |
| } |
| zfcp_fc_conditional_port_scan(fsf_req->adapter); |
| } |
| |
| static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) |
| { |
| unsigned long flags; |
| struct zfcp_adapter *adapter = req->adapter; |
| struct zfcp_port *port; |
| |
| read_lock_irqsave(&adapter->port_list_lock, flags); |
| list_for_each_entry(port, &adapter->port_list, list) |
| if (port->wwpn == wwpn) { |
| zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); |
| break; |
| } |
| read_unlock_irqrestore(&adapter->port_list_lock, flags); |
| } |
| |
| static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) |
| { |
| struct fsf_status_read_buffer *status_buffer; |
| struct fc_els_flogi *plogi; |
| |
| status_buffer = (struct fsf_status_read_buffer *) req->data; |
| plogi = (struct fc_els_flogi *) status_buffer->payload.data; |
| zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn)); |
| } |
| |
| static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) |
| { |
| struct fsf_status_read_buffer *status_buffer = |
| (struct fsf_status_read_buffer *)req->data; |
| struct fc_els_logo *logo = |
| (struct fc_els_logo *) status_buffer->payload.data; |
| |
| zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn)); |
| } |
| |
| /** |
| * zfcp_fc_incoming_els - handle incoming ELS |
| * @fsf_req - request which contains incoming ELS |
| */ |
| void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) |
| { |
| struct fsf_status_read_buffer *status_buffer = |
| (struct fsf_status_read_buffer *) fsf_req->data; |
| unsigned int els_type = status_buffer->payload.data[0]; |
| |
| zfcp_dbf_san_in_els("fciels1", fsf_req); |
| if (els_type == ELS_PLOGI) |
| zfcp_fc_incoming_plogi(fsf_req); |
| else if (els_type == ELS_LOGO) |
| zfcp_fc_incoming_logo(fsf_req); |
| else if (els_type == ELS_RSCN) |
| zfcp_fc_incoming_rscn(fsf_req); |
| } |
| |
| static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) |
| { |
| struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; |
| |
| if (ct_els->status) |
| return; |
| if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC)) |
| return; |
| |
| /* looks like a valid d_id */ |
| ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); |
| } |
| |
| static void zfcp_fc_complete(void *data) |
| { |
| complete(data); |
| } |
| |
| static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) |
| { |
| ct_hdr->ct_rev = FC_CT_REV; |
| ct_hdr->ct_fs_type = FC_FST_DIR; |
| ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; |
| ct_hdr->ct_cmd = cpu_to_be16(cmd); |
| ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4); |
| } |
| |
| static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, |
| struct zfcp_fc_req *fc_req) |
| { |
| struct zfcp_adapter *adapter = port->adapter; |
| DECLARE_COMPLETION_ONSTACK(completion); |
| struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; |
| struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; |
| int ret; |
| |
| /* setup parameters for send generic command */ |
| fc_req->ct_els.port = port; |
| fc_req->ct_els.handler = zfcp_fc_complete; |
| fc_req->ct_els.handler_data = &completion; |
| fc_req->ct_els.req = &fc_req->sg_req; |
| fc_req->ct_els.resp = &fc_req->sg_rsp; |
| sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); |
| sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); |
| |
| zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, |
| FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); |
| gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn); |
| |
| ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, |
| adapter->pool.gid_pn_req, |
| ZFCP_FC_CTELS_TMO); |
| if (!ret) { |
| wait_for_completion(&completion); |
| zfcp_fc_ns_gid_pn_eval(fc_req); |
| } |
| return ret; |
| } |
| |
| /** |
| * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request |
| * @port: port where GID_PN request is needed |
| * return: -ENOMEM on error, 0 otherwise |
| */ |
| static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) |
| { |
| int ret; |
| struct zfcp_fc_req *fc_req; |
| struct zfcp_adapter *adapter = port->adapter; |
| |
| fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); |
| if (!fc_req) |
| return -ENOMEM; |
| |
| memset(fc_req, 0, sizeof(*fc_req)); |
| |
| ret = zfcp_fc_wka_port_get(&adapter->gs->ds); |
| if (ret) |
| goto out; |
| |
| ret = zfcp_fc_ns_gid_pn_request(port, fc_req); |
| |
| zfcp_fc_wka_port_put(&adapter->gs->ds); |
| out: |
| mempool_free(fc_req, adapter->pool.gid_pn); |
| 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); |
| |
| set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ |
| 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"); |
| goto out; |
| } |
| |
| if (!port->d_id) { |
| zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); |
| goto out; |
| } |
| |
| zfcp_erp_port_reopen(port, 0, "fcgpn_3"); |
| out: |
| put_device(&port->dev); |
| } |
| |
| /** |
| * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request |
| * @port: The zfcp_port to lookup the d_id for. |
| */ |
| void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) |
| { |
| get_device(&port->dev); |
| if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) |
| put_device(&port->dev); |
| } |
| |
| /** |
| * zfcp_fc_plogi_evaluate - evaluate PLOGI playload |
| * @port: zfcp_port structure |
| * @plogi: plogi payload |
| * |
| * Evaluate PLOGI playload and copy important fields into zfcp_port structure |
| */ |
| void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) |
| { |
| if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) { |
| port->d_id = 0; |
| dev_warn(&port->adapter->ccw_device->dev, |
| "A port opened with WWPN 0x%016Lx returned data that " |
| "identifies it as WWPN 0x%016Lx\n", |
| (unsigned long long) port->wwpn, |
| (unsigned long long) be64_to_cpu(plogi->fl_wwpn)); |
| return; |
| } |
| |
| port->wwnn = be64_to_cpu(plogi->fl_wwnn); |
| port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data); |
| |
| if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID)) |
| port->supported_classes |= FC_COS_CLASS1; |
| if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID)) |
| port->supported_classes |= FC_COS_CLASS2; |
| if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID)) |
| port->supported_classes |= FC_COS_CLASS3; |
| if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID)) |
| port->supported_classes |= FC_COS_CLASS4; |
| } |
| |
| static void zfcp_fc_adisc_handler(void *data) |
| { |
| struct zfcp_fc_req *fc_req = data; |
| struct zfcp_port *port = fc_req->ct_els.port; |
| struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; |
| |
| if (fc_req->ct_els.status) { |
| /* request rejected or timed out */ |
| zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, |
| "fcadh_1"); |
| goto out; |
| } |
| |
| if (!port->wwnn) |
| port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn); |
| |
| if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) || |
| !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { |
| zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, |
| "fcadh_2"); |
| goto out; |
| } |
| |
| /* re-init to undo drop from zfcp_fc_adisc() */ |
| port->d_id = ntoh24(adisc_resp->adisc_port_id); |
| /* port is good, unblock rport without going through erp */ |
| zfcp_scsi_schedule_rport_register(port); |
| out: |
| atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); |
| put_device(&port->dev); |
| kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| } |
| |
| static int zfcp_fc_adisc(struct zfcp_port *port) |
| { |
| struct zfcp_fc_req *fc_req; |
| struct zfcp_adapter *adapter = port->adapter; |
| struct Scsi_Host *shost = adapter->scsi_host; |
| u32 d_id; |
| int ret; |
| |
| fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); |
| if (!fc_req) |
| return -ENOMEM; |
| |
| fc_req->ct_els.port = port; |
| fc_req->ct_els.req = &fc_req->sg_req; |
| fc_req->ct_els.resp = &fc_req->sg_rsp; |
| sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, |
| sizeof(struct fc_els_adisc)); |
| sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, |
| sizeof(struct fc_els_adisc)); |
| |
| fc_req->ct_els.handler = zfcp_fc_adisc_handler; |
| fc_req->ct_els.handler_data = fc_req; |
| |
| /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports |
| without FC-AL-2 capability, so we don't set it */ |
| fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost)); |
| fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost)); |
| fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; |
| hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); |
| |
| d_id = port->d_id; /* remember as destination for send els below */ |
| /* |
| * Force fresh GID_PN lookup on next port recovery. |
| * Must happen after request setup and before sending request, |
| * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler(). |
| */ |
| port->d_id = 0; |
| |
| ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els, |
| ZFCP_FC_CTELS_TMO); |
| if (ret) |
| kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| |
| return ret; |
| } |
| |
| void zfcp_fc_link_test_work(struct work_struct *work) |
| { |
| struct zfcp_port *port = |
| container_of(work, struct zfcp_port, test_link_work); |
| int retval; |
| |
| set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ |
| get_device(&port->dev); |
| port->rport_task = RPORT_DEL; |
| zfcp_scsi_rport_work(&port->rport_work); |
| |
| /* only issue one test command at one time per port */ |
| if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) |
| goto out; |
| |
| atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); |
| |
| retval = zfcp_fc_adisc(port); |
| if (retval == 0) |
| return; |
| |
| /* send of ADISC was not possible */ |
| atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); |
| zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); |
| |
| out: |
| put_device(&port->dev); |
| } |
| |
| /** |
| * zfcp_fc_test_link - lightweight link test procedure |
| * @port: port to be tested |
| * |
| * Test status of a link to a remote port using the ELS command ADISC. |
| * If there is a problem with the remote port, error recovery steps |
| * will be triggered. |
| */ |
| void zfcp_fc_test_link(struct zfcp_port *port) |
| { |
| get_device(&port->dev); |
| if (!queue_work(port->adapter->work_queue, &port->test_link_work)) |
| put_device(&port->dev); |
| } |
| |
| static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num) |
| { |
| struct zfcp_fc_req *fc_req; |
| |
| fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); |
| if (!fc_req) |
| return NULL; |
| |
| if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { |
| kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| return NULL; |
| } |
| |
| sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, |
| sizeof(struct zfcp_fc_gpn_ft_req)); |
| |
| return fc_req; |
| } |
| |
| static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, |
| struct zfcp_adapter *adapter, int max_bytes) |
| { |
| struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; |
| DECLARE_COMPLETION_ONSTACK(completion); |
| int ret; |
| |
| zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); |
| req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; |
| |
| ct_els->handler = zfcp_fc_complete; |
| ct_els->handler_data = &completion; |
| ct_els->req = &fc_req->sg_req; |
| ct_els->resp = &fc_req->sg_rsp; |
| |
| ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, |
| ZFCP_FC_CTELS_TMO); |
| if (!ret) |
| wait_for_completion(&completion); |
| return ret; |
| } |
| |
| static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) |
| { |
| if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) |
| return; |
| |
| atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); |
| |
| if ((port->supported_classes != 0) || |
| !list_empty(&port->unit_list)) |
| return; |
| |
| list_move_tail(&port->list, lh); |
| } |
| |
| static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, |
| struct zfcp_adapter *adapter, int max_entries) |
| { |
| struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| struct scatterlist *sg = &fc_req->sg_rsp; |
| struct fc_ct_hdr *hdr = sg_virt(sg); |
| struct fc_gpn_ft_resp *acc = sg_virt(sg); |
| struct zfcp_port *port, *tmp; |
| unsigned long flags; |
| LIST_HEAD(remove_lh); |
| u32 d_id; |
| int ret = 0, x, last = 0; |
| |
| if (ct_els->status) |
| return -EIO; |
| |
| if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) { |
| if (hdr->ct_reason == FC_FS_RJT_UNABL) |
| return -EAGAIN; /* might be a temporary condition */ |
| return -EIO; |
| } |
| |
| if (hdr->ct_mr_size) { |
| dev_warn(&adapter->ccw_device->dev, |
| "The name server reported %d words residual data\n", |
| hdr->ct_mr_size); |
| return -E2BIG; |
| } |
| |
| /* first entry is the header */ |
| for (x = 1; x < max_entries && !last; x++) { |
| if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) |
| acc++; |
| else |
| acc = sg_virt(++sg); |
| |
| last = acc->fp_flags & FC_NS_FID_LAST; |
| d_id = ntoh24(acc->fp_fid); |
| |
| /* don't attach ports with a well known address */ |
| if (d_id >= FC_FID_WELL_KNOWN_BASE) |
| continue; |
| /* skip the adapter's port and known remote ports */ |
| if (be64_to_cpu(acc->fp_wwpn) == |
| fc_host_port_name(adapter->scsi_host)) |
| continue; |
| |
| port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn), |
| ZFCP_STATUS_COMMON_NOESC, d_id); |
| if (!IS_ERR(port)) |
| zfcp_erp_port_reopen(port, 0, "fcegpf1"); |
| else if (PTR_ERR(port) != -EEXIST) |
| ret = PTR_ERR(port); |
| } |
| |
| zfcp_erp_wait(adapter); |
| write_lock_irqsave(&adapter->port_list_lock, flags); |
| list_for_each_entry_safe(port, tmp, &adapter->port_list, list) |
| zfcp_fc_validate_port(port, &remove_lh); |
| write_unlock_irqrestore(&adapter->port_list_lock, flags); |
| |
| list_for_each_entry_safe(port, tmp, &remove_lh, list) { |
| zfcp_erp_port_shutdown(port, 0, "fcegpf2"); |
| device_unregister(&port->dev); |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * zfcp_fc_scan_ports - scan remote ports and attach new ports |
| * @work: reference to scheduled work |
| */ |
| void zfcp_fc_scan_ports(struct work_struct *work) |
| { |
| struct delayed_work *dw = to_delayed_work(work); |
| struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, |
| scan_work); |
| int ret, i; |
| struct zfcp_fc_req *fc_req; |
| int chain, max_entries, buf_num, max_bytes; |
| |
| zfcp_fc_port_scan_time(adapter); |
| |
| chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; |
| buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; |
| max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; |
| max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; |
| |
| if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && |
| fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) |
| return; |
| |
| if (zfcp_fc_wka_port_get(&adapter->gs->ds)) |
| return; |
| |
| fc_req = zfcp_fc_alloc_sg_env(buf_num); |
| if (!fc_req) |
| goto out; |
| |
| for (i = 0; i < 3; i++) { |
| ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); |
| if (!ret) { |
| ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); |
| if (ret == -EAGAIN) |
| ssleep(1); |
| else |
| break; |
| } |
| } |
| zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); |
| kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| out: |
| zfcp_fc_wka_port_put(&adapter->gs->ds); |
| } |
| |
| static int zfcp_fc_gspn(struct zfcp_adapter *adapter, |
| struct zfcp_fc_req *fc_req) |
| { |
| DECLARE_COMPLETION_ONSTACK(completion); |
| char devno[] = "DEVNO:"; |
| struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; |
| struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; |
| int ret; |
| |
| zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, |
| FC_SYMBOLIC_NAME_SIZE); |
| hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); |
| |
| sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); |
| sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); |
| |
| ct_els->handler = zfcp_fc_complete; |
| ct_els->handler_data = &completion; |
| ct_els->req = &fc_req->sg_req; |
| ct_els->resp = &fc_req->sg_rsp; |
| |
| ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, |
| ZFCP_FC_CTELS_TMO); |
| if (ret) |
| return ret; |
| |
| wait_for_completion(&completion); |
| if (ct_els->status) |
| return ct_els->status; |
| |
| if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && |
| !(strstr(gspn_rsp->gspn.fp_name, devno))) |
| snprintf(fc_host_symbolic_name(adapter->scsi_host), |
| FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", |
| gspn_rsp->gspn.fp_name, devno, |
| dev_name(&adapter->ccw_device->dev), |
| init_utsname()->nodename); |
| else |
| strlcpy(fc_host_symbolic_name(adapter->scsi_host), |
| gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); |
| |
| return 0; |
| } |
| |
| static void zfcp_fc_rspn(struct zfcp_adapter *adapter, |
| struct zfcp_fc_req *fc_req) |
| { |
| DECLARE_COMPLETION_ONSTACK(completion); |
| struct Scsi_Host *shost = adapter->scsi_host; |
| struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; |
| struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; |
| struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; |
| int ret, len; |
| |
| zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, |
| FC_SYMBOLIC_NAME_SIZE); |
| hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); |
| len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), |
| FC_SYMBOLIC_NAME_SIZE); |
| rspn_req->rspn.fr_name_len = len; |
| |
| sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); |
| sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); |
| |
| ct_els->handler = zfcp_fc_complete; |
| ct_els->handler_data = &completion; |
| ct_els->req = &fc_req->sg_req; |
| ct_els->resp = &fc_req->sg_rsp; |
| |
| ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, |
| ZFCP_FC_CTELS_TMO); |
| if (!ret) |
| wait_for_completion(&completion); |
| } |
| |
| /** |
| * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name |
| * @work: ns_up_work of the adapter where to update the symbolic port name |
| * |
| * Retrieve the current symbolic port name that may have been set by |
| * the hardware using the GSPN request and update the fc_host |
| * symbolic_name sysfs attribute. When running in NPIV mode (and hence |
| * the port name is unique for this system), update the symbolic port |
| * name to add Linux specific information and update the FC nameserver |
| * using the RSPN request. |
| */ |
| void zfcp_fc_sym_name_update(struct work_struct *work) |
| { |
| struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, |
| ns_up_work); |
| int ret; |
| struct zfcp_fc_req *fc_req; |
| |
| if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && |
| fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) |
| return; |
| |
| fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); |
| if (!fc_req) |
| return; |
| |
| ret = zfcp_fc_wka_port_get(&adapter->gs->ds); |
| if (ret) |
| goto out_free; |
| |
| ret = zfcp_fc_gspn(adapter, fc_req); |
| if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) |
| goto out_ds_put; |
| |
| memset(fc_req, 0, sizeof(*fc_req)); |
| zfcp_fc_rspn(adapter, fc_req); |
| |
| out_ds_put: |
| zfcp_fc_wka_port_put(&adapter->gs->ds); |
| out_free: |
| kmem_cache_free(zfcp_fc_req_cache, fc_req); |
| } |
| |
| static void zfcp_fc_ct_els_job_handler(void *data) |
| { |
| struct bsg_job *job = data; |
| struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; |
| struct fc_bsg_reply *jr = job->reply; |
| |
| jr->reply_payload_rcv_len = job->reply_payload.payload_len; |
| jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; |
| jr->result = zfcp_ct_els->status ? -EIO : 0; |
| bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); |
| } |
| |
| static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) |
| { |
| u32 preamble_word1; |
| u8 gs_type; |
| struct zfcp_adapter *adapter; |
| struct fc_bsg_request *bsg_request = job->request; |
| struct fc_rport *rport = fc_bsg_to_rport(job); |
| struct Scsi_Host *shost; |
| |
| preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; |
| gs_type = (preamble_word1 & 0xff000000) >> 24; |
| |
| shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); |
| adapter = (struct zfcp_adapter *) shost->hostdata[0]; |
| |
| switch (gs_type) { |
| case FC_FST_ALIAS: |
| return &adapter->gs->as; |
| case FC_FST_MGMT: |
| return &adapter->gs->ms; |
| case FC_FST_TIME: |
| return &adapter->gs->ts; |
| break; |
| case FC_FST_DIR: |
| return &adapter->gs->ds; |
| break; |
| default: |
| return NULL; |
| } |
| } |
| |
| static void zfcp_fc_ct_job_handler(void *data) |
| { |
| struct bsg_job *job = data; |
| struct zfcp_fc_wka_port *wka_port; |
| |
| wka_port = zfcp_fc_job_wka_port(job); |
| zfcp_fc_wka_port_put(wka_port); |
| |
| zfcp_fc_ct_els_job_handler(data); |
| } |
| |
| static int zfcp_fc_exec_els_job(struct bsg_job *job, |
| struct zfcp_adapter *adapter) |
| { |
| struct zfcp_fsf_ct_els *els = job->dd_data; |
| struct fc_rport *rport = fc_bsg_to_rport(job); |
| struct fc_bsg_request *bsg_request = job->request; |
| struct zfcp_port *port; |
| u32 d_id; |
| |
| if (rport) { |
| port = zfcp_get_port_by_wwpn(adapter, rport->port_name); |
| if (!port) |
| return -EINVAL; |
| |
| d_id = port->d_id; |
| put_device(&port->dev); |
| } else |
| d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); |
| |
| els->handler = zfcp_fc_ct_els_job_handler; |
| return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ); |
| } |
| |
| static int zfcp_fc_exec_ct_job(struct bsg_job *job, |
| struct zfcp_adapter *adapter) |
| { |
| int ret; |
| struct zfcp_fsf_ct_els *ct = job->dd_data; |
| struct zfcp_fc_wka_port *wka_port; |
| |
| wka_port = zfcp_fc_job_wka_port(job); |
| if (!wka_port) |
| return -EINVAL; |
| |
| ret = zfcp_fc_wka_port_get(wka_port); |
| if (ret) |
| return ret; |
| |
| ct->handler = zfcp_fc_ct_job_handler; |
| ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ); |
| if (ret) |
| zfcp_fc_wka_port_put(wka_port); |
| |
| return ret; |
| } |
| |
| int zfcp_fc_exec_bsg_job(struct bsg_job *job) |
| { |
| struct Scsi_Host *shost; |
| struct zfcp_adapter *adapter; |
| struct zfcp_fsf_ct_els *ct_els = job->dd_data; |
| struct fc_bsg_request *bsg_request = job->request; |
| struct fc_rport *rport = fc_bsg_to_rport(job); |
| |
| shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); |
| adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| |
| if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) |
| return -EINVAL; |
| |
| ct_els->req = job->request_payload.sg_list; |
| ct_els->resp = job->reply_payload.sg_list; |
| ct_els->handler_data = job; |
| |
| switch (bsg_request->msgcode) { |
| case FC_BSG_RPT_ELS: |
| case FC_BSG_HST_ELS_NOLOGIN: |
| return zfcp_fc_exec_els_job(job, adapter); |
| case FC_BSG_RPT_CT: |
| case FC_BSG_HST_CT: |
| return zfcp_fc_exec_ct_job(job, adapter); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| int zfcp_fc_timeout_bsg_job(struct bsg_job *job) |
| { |
| /* hardware tracks timeout, reset bsg timeout to not interfere */ |
| return -EAGAIN; |
| } |
| |
| int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) |
| { |
| struct zfcp_fc_wka_ports *wka_ports; |
| |
| wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); |
| if (!wka_ports) |
| return -ENOMEM; |
| |
| adapter->gs = wka_ports; |
| zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); |
| zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); |
| zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); |
| zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); |
| |
| return 0; |
| } |
| |
| void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) |
| { |
| kfree(adapter->gs); |
| adapter->gs = NULL; |
| } |
| |