1 files changed, 248 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index bb07c3bf2258..aa2d9a668d17 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -8,6 +8,37 @@
 
 #include "zfcp_ext.h"
 
+struct ct_iu_gpn_ft_req {
+        struct ct_hdr header;
+        u8 flags;
+        u8 domain_id_scope;
+        u8 area_id_scope;
+        u8 fc4_type;
+} __attribute__ ((packed));
+
+struct gpn_ft_resp_acc {
+        u8 control;
+        u8 port_id[3];
+        u8 reserved[4];
+        u64 wwpn;
+} __attribute__ ((packed));
+
+#define ZFCP_GPN_FT_ENTRIES ((PAGE_SIZE - sizeof(struct ct_hdr)) \
+                                / sizeof(struct gpn_ft_resp_acc))
+#define ZFCP_GPN_FT_BUFFERS 4
+#define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
+
+struct ct_iu_gpn_ft_resp {
+        struct ct_hdr header;
+        struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
+} __attribute__ ((packed));
+
+struct zfcp_gpn_ft {
+        struct zfcp_send_ct ct;
+        struct scatterlist sg_req;
+        struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
+};
+
 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
                                    struct fcp_rscn_element *elem)
 {
@@ -68,6 +99,7 @@ static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
                 }
                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
         }
+        schedule_work(&fsf_req->adapter->scan_work);
 }
 
 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
@@ -303,3 +335,219 @@ void zfcp_test_link(struct zfcp_port *port)
         zfcp_port_put(port);
         zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
 }
+
+static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
+{
+        int ret;
+
+        if (!adapter->nameserver_port)
+                return -EINTR;
+
+        if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
+                               &adapter->nameserver_port->status)) {
+                ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148,
+                                           NULL);
+                if (ret)
+                        return ret;
+                zfcp_erp_wait(adapter);
+                zfcp_port_put(adapter->nameserver_port);
+        }
+        return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
+                                  &adapter->nameserver_port->status);
+}
+
+static void zfcp_gpn_ft_handler(unsigned long _done)
+{
+        complete((struct completion *)_done);
+}
+
+static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
+{
+        struct scatterlist *sg = &gpn_ft->sg_req;
+
+        kfree(sg_virt(sg)); /* free request buffer */
+        zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
+
+        kfree(gpn_ft);
+}
+
+static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
+{
+        struct zfcp_gpn_ft *gpn_ft;
+        struct ct_iu_gpn_ft_req *req;
+
+        gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
+        if (!gpn_ft)
+                return NULL;
+
+        req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
+        if (!req) {
+                kfree(gpn_ft);
+                gpn_ft = NULL;
+                goto out;
+        }
+        sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
+
+        if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
+                zfcp_free_sg_env(gpn_ft);
+                gpn_ft = NULL;
+        }
+out:
+        return gpn_ft;
+}
+
+
+static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
+                                  struct zfcp_adapter *adapter)
+{
+        struct zfcp_send_ct *ct = &gpn_ft->ct;
+        struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
+        struct completion done;
+        int ret;
+
+        /* prepare CT IU for GPN_FT */
+        req->header.revision = ZFCP_CT_REVISION;
+        req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
+        req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
+        req->header.options = ZFCP_CT_SYNCHRONOUS;
+        req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
+        req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
+                                        (ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
+        req->flags = 0;
+        req->domain_id_scope = 0;
+        req->area_id_scope = 0;
+        req->fc4_type = ZFCP_CT_SCSI_FCP;
+
+        /* prepare zfcp_send_ct */
+        ct->port = adapter->nameserver_port;
+        ct->handler = zfcp_gpn_ft_handler;
+        ct->handler_data = (unsigned long)&done;
+        ct->timeout = 10;
+        ct->req = &gpn_ft->sg_req;
+        ct->resp = gpn_ft->sg_resp;
+        ct->req_count = 1;
+        ct->resp_count = ZFCP_GPN_FT_BUFFERS;
+
+        init_completion(&done);
+        ret = zfcp_fsf_send_ct(ct, NULL, NULL);
+        if (!ret)
+                wait_for_completion(&done);
+        return ret;
+}
+
+static void zfcp_validate_port(struct zfcp_port *port)
+{
+        struct zfcp_adapter *adapter = port->adapter;
+
+        atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
+
+        if (port == adapter->nameserver_port)
+                return;
+        if ((port->supported_classes != 0) || (port->units != 0)) {
+                zfcp_port_put(port);
+                return;
+        }
+        zfcp_erp_port_shutdown(port, 0, 151, NULL);
+        zfcp_erp_wait(adapter);
+        zfcp_port_put(port);
+        zfcp_port_dequeue(port);
+}
+
+static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
+{
+        struct zfcp_send_ct *ct = &gpn_ft->ct;
+        struct scatterlist *sg = gpn_ft->sg_resp;
+        struct ct_hdr *hdr = sg_virt(sg);
+        struct gpn_ft_resp_acc *acc = sg_virt(sg);
+        struct zfcp_adapter *adapter = ct->port->adapter;
+        struct zfcp_port *port, *tmp;
+        u32 d_id;
+        int ret = 0, x;
+
+        if (ct->status)
+                return -EIO;
+
+        if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
+                if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
+                        return -EAGAIN; /* might be a temporary condition */
+                return -EIO;
+        }
+
+        if (hdr->max_res_size)
+                return -E2BIG;
+
+        down(&zfcp_data.config_sema);
+
+        /* first entry is the header */
+        for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES; x++) {
+                if (x % (ZFCP_GPN_FT_ENTRIES + 1))
+                        acc++;
+                else
+                        acc = sg_virt(++sg);
+
+                d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
+                       acc->port_id[2];
+
+                /* skip the adapter's port and known remote ports */
+                if (acc->wwpn == fc_host_port_name(adapter->scsi_host) ||
+                     zfcp_get_port_by_did(adapter, d_id))
+                        continue;
+
+                port = zfcp_port_enqueue(adapter, acc->wwpn,
+                                         ZFCP_STATUS_PORT_DID_DID |
+                                         ZFCP_STATUS_COMMON_NOESC, d_id);
+                if (port)
+                        zfcp_erp_port_reopen(port, 0, 149, NULL);
+                else
+                        ret = -ENOMEM;
+                if (acc->control & 0x80) /* last entry */
+                        break;
+        }
+
+        zfcp_erp_wait(adapter);
+        list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
+                zfcp_validate_port(port);
+        up(&zfcp_data.config_sema);
+        return ret;
+}
+
+/**
+ * zfcp_scan_ports - scan remote ports and attach new ports
+ * @adapter: pointer to struct zfcp_adapter
+ */
+int zfcp_scan_ports(struct zfcp_adapter *adapter)
+{
+        int ret, i;
+        struct zfcp_gpn_ft *gpn_ft;
+
+        if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
+                return 0;
+
+        ret = zfcp_scan_get_nameserver(adapter);
+        if (ret)
+                return ret;
+
+        gpn_ft = zfcp_alloc_sg_env();
+        if (!gpn_ft)
+                return -ENOMEM;
+
+        for (i = 0; i < 3; i++) {
+                ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
+                if (!ret) {
+                        ret = zfcp_scan_eval_gpn_ft(gpn_ft);
+                        if (ret == -EAGAIN)
+                                ssleep(1);
+                        else
+                                break;
+                }
+        }
+        zfcp_free_sg_env(gpn_ft);
+
+        return ret;
+}
+
+
+void _zfcp_scan_ports_later(struct work_struct *work)
+{
+        zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
+}