1 files changed, 567 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
new file mode 100644
index 000000000000..e984469bb98b
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -0,0 +1,567 @@
+/*
+ * zfcp device driver
+ *
+ * Fibre Channel related functions for the zfcp device driver.
+ *
+ * Copyright IBM Corporation 2008
+ */
+
+#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 struct zfcp_port *zfcp_get_port_by_did(struct zfcp_adapter *adapter,
+                                              u32 d_id)
+{
+        struct zfcp_port *port;
+
+        list_for_each_entry(port, &adapter->port_list_head, list)
+                if ((port->d_id == d_id) &&
+                    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
+                        return port;
+        return NULL;
+}
+
+static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
+                                   struct fcp_rscn_element *elem)
+{
+        unsigned long flags;
+        struct zfcp_port *port;
+
+        read_lock_irqsave(&zfcp_data.config_lock, flags);
+        list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
+                if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
+                        continue;
+                /* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
+                if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
+                        /* Try to connect to unused ports anyway. */
+                        zfcp_erp_port_reopen(port,
+                                             ZFCP_STATUS_COMMON_ERP_FAILED,
+                                             82, fsf_req);
+                else if ((port->d_id & range) == (elem->nport_did & range))
+                        /* Check connection status for connected ports */
+                        zfcp_test_link(port);
+        }
+        read_unlock_irqrestore(&zfcp_data.config_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 fcp_rscn_head *fcp_rscn_head;
+        struct fcp_rscn_element *fcp_rscn_element;
+        u16 i;
+        u16 no_entries;
+        u32 range_mask;
+
+        fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
+        fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
+
+        /* see FC-FS */
+        no_entries = fcp_rscn_head->payload_len /
+                        sizeof(struct fcp_rscn_element);
+
+        for (i = 1; i < no_entries; i++) {
+                /* skip head and start with 1st element */
+                fcp_rscn_element++;
+                switch (fcp_rscn_element->addr_format) {
+                case ZFCP_PORT_ADDRESS:
+                        range_mask = ZFCP_PORTS_RANGE_PORT;
+                        break;
+                case ZFCP_AREA_ADDRESS:
+                        range_mask = ZFCP_PORTS_RANGE_AREA;
+                        break;
+                case ZFCP_DOMAIN_ADDRESS:
+                        range_mask = ZFCP_PORTS_RANGE_DOMAIN;
+                        break;
+                case ZFCP_FABRIC_ADDRESS:
+                        range_mask = ZFCP_PORTS_RANGE_FABRIC;
+                        break;
+                default:
+                        continue;
+                }
+                _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)
+{
+        struct zfcp_adapter *adapter = req->adapter;
+        struct zfcp_port *port;
+        unsigned long flags;
+
+        read_lock_irqsave(&zfcp_data.config_lock, flags);
+        list_for_each_entry(port, &adapter->port_list_head, list)
+                if (port->wwpn == wwpn)
+                        break;
+        read_unlock_irqrestore(&zfcp_data.config_lock, flags);
+
+        if (port && (port->wwpn == wwpn))
+                zfcp_erp_port_forced_reopen(port, 0, 83, req);
+}
+
+static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
+{
+        struct fsf_status_read_buffer *status_buffer =
+                (struct fsf_status_read_buffer *)req->data;
+        struct fsf_plogi *els_plogi =
+                (struct fsf_plogi *) status_buffer->payload.data;
+
+        zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.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 fcp_logo *els_logo =
+                (struct fcp_logo *) status_buffer->payload.data;
+
+        zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
+}
+
+/**
+ * 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_san_dbf_event_incoming_els(fsf_req);
+        if (els_type == LS_PLOGI)
+                zfcp_fc_incoming_plogi(fsf_req);
+        else if (els_type == LS_LOGO)
+                zfcp_fc_incoming_logo(fsf_req);
+        else if (els_type == LS_RSCN)
+                zfcp_fc_incoming_rscn(fsf_req);
+}
+
+static void zfcp_ns_gid_pn_handler(unsigned long data)
+{
+        struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
+        struct zfcp_send_ct *ct = &gid_pn->ct;
+        struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
+        struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
+        struct zfcp_port *port = gid_pn->port;
+
+        if (ct->status)
+                goto out;
+        if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
+                atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
+                goto out;
+        }
+        /* paranoia */
+        if (ct_iu_req->wwpn != port->wwpn)
+                goto out;
+        /* looks like a valid d_id */
+        port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
+        atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
+out:
+        mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
+}
+
+/**
+ * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
+ * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
+ * return: -ENOMEM on error, 0 otherwise
+ */
+int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
+{
+        int ret;
+        struct zfcp_gid_pn_data *gid_pn;
+        struct zfcp_adapter *adapter = erp_action->adapter;
+
+        gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
+        if (!gid_pn)
+                return -ENOMEM;
+
+        memset(gid_pn, 0, sizeof(*gid_pn));
+
+        /* setup parameters for send generic command */
+        gid_pn->port = erp_action->port;
+        gid_pn->ct.port = adapter->nameserver_port;
+        gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
+        gid_pn->ct.handler_data = (unsigned long) gid_pn;
+        gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
+        gid_pn->ct.req = &gid_pn->req;
+        gid_pn->ct.resp = &gid_pn->resp;
+        gid_pn->ct.req_count = 1;
+        gid_pn->ct.resp_count = 1;
+        sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
+                    sizeof(struct ct_iu_gid_pn_req));
+        sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
+                    sizeof(struct ct_iu_gid_pn_resp));
+
+        /* setup nameserver request */
+        gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
+        gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
+        gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
+        gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
+        gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
+        gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
+        gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
+
+        ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
+                               erp_action);
+        if (ret)
+                mempool_free(gid_pn, adapter->pool.data_gid_pn);
+        return ret;
+}
+
+/**
+ * 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 fsf_plogi *plogi)
+{
+        port->maxframe_size = plogi->serv_param.common_serv_param[7] |
+                ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
+        if (plogi->serv_param.class1_serv_param[0] & 0x80)
+                port->supported_classes |= FC_COS_CLASS1;
+        if (plogi->serv_param.class2_serv_param[0] & 0x80)
+                port->supported_classes |= FC_COS_CLASS2;
+        if (plogi->serv_param.class3_serv_param[0] & 0x80)
+                port->supported_classes |= FC_COS_CLASS3;
+        if (plogi->serv_param.class4_serv_param[0] & 0x80)
+                port->supported_classes |= FC_COS_CLASS4;
+}
+
+struct zfcp_els_adisc {
+        struct zfcp_send_els els;
+        struct scatterlist req;
+        struct scatterlist resp;
+        struct zfcp_ls_adisc ls_adisc;
+        struct zfcp_ls_adisc_acc ls_adisc_acc;
+};
+
+static void zfcp_fc_adisc_handler(unsigned long data)
+{
+        struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
+        struct zfcp_port *port = adisc->els.port;
+        struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;
+
+        if (adisc->els.status) {
+                /* request rejected or timed out */
+                zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
+                goto out;
+        }
+
+        if (!port->wwnn)
+                port->wwnn = ls_adisc->wwnn;
+
+        if (port->wwpn != ls_adisc->wwpn)
+                zfcp_erp_port_reopen(port, 0, 64, NULL);
+
+ out:
+        zfcp_port_put(port);
+        kfree(adisc);
+}
+
+static int zfcp_fc_adisc(struct zfcp_port *port)
+{
+        struct zfcp_els_adisc *adisc;
+        struct zfcp_adapter *adapter = port->adapter;
+
+        adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
+        if (!adisc)
+                return -ENOMEM;
+
+        adisc->els.req = &adisc->req;
+        adisc->els.resp = &adisc->resp;
+        sg_init_one(adisc->els.req, &adisc->ls_adisc,
+                    sizeof(struct zfcp_ls_adisc));
+        sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
+                    sizeof(struct zfcp_ls_adisc_acc));
+
+        adisc->els.req_count = 1;
+        adisc->els.resp_count = 1;
+        adisc->els.adapter = adapter;
+        adisc->els.port = port;
+        adisc->els.d_id = port->d_id;
+        adisc->els.handler = zfcp_fc_adisc_handler;
+        adisc->els.handler_data = (unsigned long) adisc;
+        adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
+
+        /* 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 */
+        adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
+        adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
+        adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
+
+        return zfcp_fsf_send_els(&adisc->els);
+}
+
+/**
+ * zfcp_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_test_link(struct zfcp_port *port)
+{
+        int retval;
+
+        zfcp_port_get(port);
+        retval = zfcp_fc_adisc(port);
+        if (retval == 0 || retval == -EBUSY)
+                return;
+
+        /* send of ADISC was not possible */
+        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 (IS_ERR(port))
+                        ret = PTR_ERR(port);
+                else
+                        zfcp_erp_port_reopen(port, 0, 149, NULL);
+                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;
+
+        zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
+        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));
+}