--- /dev/null
+/*
+ * zfcp device driver
+ *
+ * Fibre Channel related functions for the zfcp device driver.
+ *
+ * Copyright IBM Corp. 2008, 2010
+ */
+
+#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 <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_named(no_auto_port_rescan, 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)
+{
+ 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))
+ wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
+ }
+
+ mutex_unlock(&wka_port->mutex);
+
+ wait_event(wka_port->completion_wq,
+ 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);
+ return 0;
+ }
+ return -EIO;
+}
+
+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)) {
+ wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
+ wake_up(&wka_port->completion_wq);
+ }
+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 */
+ schedule_delayed_work(&wka_port->work, HZ / 100);
+}
+
+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->completion_wq);
+
+ 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);
+ if (!port->d_id)
+ zfcp_erp_port_reopen(port,
+ ZFCP_STATUS_COMMON_ERP_FAILED,
+ "fcrscn1");
+ }
+ 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 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 = head->rscn_plen / sizeof(struct fc_els_rscn_page);
+
+ 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, 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, 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 != 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 = cmd;
+ ct_hdr->ct_mr_size = 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 = 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);
+
+ 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 (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) plogi->fl_wwpn);
+ return;
+ }
+
+ port->wwnn = plogi->fl_wwnn;
+ port->maxframe_size = plogi->fl_csp.sp_bb_data;
+
+ if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID)
+ port->supported_classes |= FC_COS_CLASS1;
+ if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID)
+ port->supported_classes |= FC_COS_CLASS2;
+ if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID)
+ port->supported_classes |= FC_COS_CLASS3;
+ if (plogi->fl_cssp[3].cp_class & 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 = adisc_resp->adisc_wwnn;
+
+ if ((port->wwpn != 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;
+ }
+
+ /* port is good, unblock rport without going through erp */
+ zfcp_scsi_schedule_rport_register(port);
+ out:
+ atomic_clear_mask(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;
+ 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 = fc_host_port_name(shost);
+ fc_req->u.adisc.req.adisc_wwnn = 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));
+
+ ret = zfcp_fsf_send_els(adapter, port->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;
+
+ 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_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
+
+ retval = zfcp_fc_adisc(port);
+ if (retval == 0)
+ return;
+
+ /* send of ADISC was not possible */
+ atomic_clear_mask(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_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_clear_mask(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 != FC_FS_ACC) {
+ if (hdr->ct_reason == FC_BA_RJT_UNABLE)
+ 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 (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
+ continue;
+
+ port = zfcp_port_enqueue(adapter, 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_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 fc_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;
+ job->job_done(job);
+}
+
+static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
+{
+ u32 preamble_word1;
+ u8 gs_type;
+ struct zfcp_adapter *adapter;
+
+ preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
+ gs_type = (preamble_word1 & 0xff000000) >> 24;
+
+ adapter = (struct zfcp_adapter *) job->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 fc_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 fc_bsg_job *job,
+ struct zfcp_adapter *adapter)
+{
+ struct zfcp_fsf_ct_els *els = job->dd_data;
+ struct fc_rport *rport = job->rport;
+ 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(job->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->req->timeout / HZ);
+}
+
+static int zfcp_fc_exec_ct_job(struct fc_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->req->timeout / HZ);
+ if (ret)
+ zfcp_fc_wka_port_put(wka_port);
+
+ return ret;
+}
+
+int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
+{
+ struct Scsi_Host *shost;
+ struct zfcp_adapter *adapter;
+ struct zfcp_fsf_ct_els *ct_els = job->dd_data;
+
+ shost = job->rport ? rport_to_shost(job->rport) : job->shost;
+ 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 (job->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 fc_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;
+}
+
Code Review / kvmfornfv.git / blobdiff