[SCSI] zfcp: Add information to symbolic port name when running in NPIV mode

Query the FC symbolic port name for reporting in the fc_host sysfs and
enable the symbolic_name attribute in the fc_host sysfs. When running
in NPIV mode, extend the symbolic port name with the devno and the
hostname. This allows better identification of Linux systems for SAN
and storage administrators.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

7 files changed, 169 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 88691adc1283..645b0fcbb370 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -362,6 +362,7 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 
         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
         INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
+        INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);
 
         if (zfcp_qdio_setup(adapter))
                 goto failed;
@@ -427,6 +428,7 @@ void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
 
         cancel_work_sync(&adapter->scan_work);
         cancel_work_sync(&adapter->stat_work);
+        cancel_work_sync(&adapter->ns_up_work);
         zfcp_destroy_adapter_work_queue(adapter);
 
         zfcp_fc_wka_ports_force_offline(adapter->gs);
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 1566208997b6..527ba48eea57 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -189,6 +189,7 @@ struct zfcp_adapter {
         struct fsf_qtcb_bottom_port *stats_reset_data;
         unsigned long           stats_reset;
         struct work_struct      scan_work;
+        struct work_struct      ns_up_work;
         struct service_level    service_level;
         struct workqueue_struct *work_queue;
         struct device_dma_parameters dma_parms;
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 6c1cddf0d0a0..e1b4f800e226 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -1231,8 +1231,10 @@ static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
                 if (result == ZFCP_ERP_SUCCEEDED) {
                         register_service_level(&adapter->service_level);
                         queue_work(adapter->work_queue, &adapter->scan_work);
+                        queue_work(adapter->work_queue, &adapter->ns_up_work);
                 } else
                         unregister_service_level(&adapter->service_level);
+
                 kref_put(&adapter->ref, zfcp_adapter_release);
                 break;
         }
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 410d9ddc175a..03627cfd81cd 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -96,6 +96,7 @@ extern int zfcp_fc_gs_setup(struct zfcp_adapter *);
 extern void zfcp_fc_gs_destroy(struct zfcp_adapter *);
 extern int zfcp_fc_exec_bsg_job(struct fc_bsg_job *);
 extern int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *);
+extern void zfcp_fc_sym_name_update(struct work_struct *);
 
 /* zfcp_fsf.c */
 extern struct kmem_cache *zfcp_fsf_qtcb_cache;
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index c839a3b6879d..297e6b71ce9c 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -11,6 +11,7 @@
 
 #include <linux/types.h>
 #include <linux/slab.h>
+#include <linux/utsname.h>
 #include <scsi/fc/fc_els.h>
 #include <scsi/libfc.h>
 #include "zfcp_ext.h"
@@ -696,6 +697,125 @@ 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;
diff --git a/drivers/s390/scsi/zfcp_fc.h b/drivers/s390/scsi/zfcp_fc.h
index 5243ce44aa42..4561f3bf7300 100644
--- a/drivers/s390/scsi/zfcp_fc.h
+++ b/drivers/s390/scsi/zfcp_fc.h
@@ -84,6 +84,40 @@ struct zfcp_fc_gpn_ft_req {
 } __packed;
 
 /**
+ * struct zfcp_fc_gspn_req - container for ct header plus GSPN_ID request
+ * @ct_hdr: FC GS common transport header
+ * @gspn: GSPN_ID request
+ */
+struct zfcp_fc_gspn_req {
+        struct fc_ct_hdr        ct_hdr;
+        struct fc_gid_pn_resp   gspn;
+} __packed;
+
+/**
+ * struct zfcp_fc_gspn_rsp - container for ct header plus GSPN_ID response
+ * @ct_hdr: FC GS common transport header
+ * @gspn: GSPN_ID response
+ * @name: The name string of the GSPN_ID response
+ */
+struct zfcp_fc_gspn_rsp {
+        struct fc_ct_hdr        ct_hdr;
+        struct fc_gspn_resp     gspn;
+        char                    name[FC_SYMBOLIC_NAME_SIZE];
+} __packed;
+
+/**
+ * struct zfcp_fc_rspn_req - container for ct header plus RSPN_ID request
+ * @ct_hdr: FC GS common transport header
+ * @rspn: RSPN_ID request
+ * @name: The name string of the RSPN_ID request
+ */
+struct zfcp_fc_rspn_req {
+        struct fc_ct_hdr        ct_hdr;
+        struct fc_ns_rspn       rspn;
+        char                    name[FC_SYMBOLIC_NAME_SIZE];
+} __packed;
+
+/**
  * struct zfcp_fc_req - Container for FC ELS and CT requests sent from zfcp
  * @ct_els: data required for issuing fsf command
  * @sg_req: scatterlist entry for request data
@@ -107,6 +141,14 @@ struct zfcp_fc_req {
                         struct scatterlist sg_rsp2[ZFCP_FC_GPN_FT_NUM_BUFS - 1];
                         struct zfcp_fc_gpn_ft_req       req;
                 } gpn_ft;
+                struct {
+                        struct zfcp_fc_gspn_req         req;
+                        struct zfcp_fc_gspn_rsp         rsp;
+                } gspn;
+                struct {
+                        struct zfcp_fc_rspn_req         req;
+                        struct fc_ct_hdr                rsp;
+                } rspn;
         } u;
 };
 
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index dbba0827127f..2a4991d6d4d5 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -720,6 +720,7 @@ struct fc_function_template zfcp_transport_functions = {
         /* no functions registered for following dynamic attributes but
            directly set by LLDD */
         .show_host_port_type = 1,
+        .show_host_symbolic_name = 1,
         .show_host_speed = 1,
         .show_host_port_id = 1,
         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),