diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/scsi/zfcp_fc.c | 1122 |
1 files changed, 1122 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c new file mode 100644 index 000000000..d323f9985 --- /dev/null +++ b/drivers/s390/scsi/zfcp_fc.c @@ -0,0 +1,1122 @@ +// 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 prandom_u32_max(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 still good, nothing to do */ + 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 */ + + /* 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); +} + +/** + * zfcp_fc_sg_free_table - free memory used by scatterlists + * @sg: pointer to scatterlist + * @count: number of scatterlist which are to be free'ed + * the scatterlist are expected to reference pages always + */ +static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count) +{ + int i; + + for (i = 0; i < count; i++, sg = sg_next(sg)) + if (sg) + free_page((unsigned long) sg_virt(sg)); + else + break; +} + +/** + * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers + * @sg: pointer to struct scatterlist + * @count: number of scatterlists which should be assigned with buffers + * of size page + * + * Returns: 0 on success, -ENOMEM otherwise + */ +static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count) +{ + void *addr; + int i; + + sg_init_table(sg, count); + for (i = 0; i < count; i++, sg = sg_next(sg)) { + addr = (void *) get_zeroed_page(GFP_KERNEL); + if (!addr) { + zfcp_fc_sg_free_table(sg, i); + return -ENOMEM; + } + sg_set_buf(sg, addr, PAGE_SIZE); + } + return 0; +} + +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_fc_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_fc_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; +} + |