zfcp: add point-2-point support

From: Andreas Herrmann <aherrman@de.ibm.com>

This patch mainly introduces support for point-2-point
topology.

From: Heiko Carstens <heiko.carstens@de.ibm.com>
From: Maxim Shchetynin <maxim@de.ibm.com>
From: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index cfc0d8c588df..53ebc1cdfe2d 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -2568,6 +2568,23 @@ zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *erp_action)
         case ZFCP_ERP_STEP_UNINITIALIZED:
         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
         case ZFCP_ERP_STEP_PORT_CLOSING:
+                if (adapter->fc_topology == FSF_TOPO_P2P) {
+                        if (port->wwpn != adapter->peer_wwpn) {
+                                ZFCP_LOG_NORMAL("Failed to open port 0x%016Lx "
+                                                "on adapter %s.\nPeer WWPN "
+                                                "0x%016Lx does not match\n",
+                                                port->wwpn,
+                                                zfcp_get_busid_by_adapter(adapter),
+                                                adapter->peer_wwpn);
+                                zfcp_erp_port_failed(port);
+                                retval = ZFCP_ERP_FAILED;
+                                break;
+                        }
+                        port->d_id = adapter->peer_d_id;
+                        atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
+                        retval = zfcp_erp_port_strategy_open_port(erp_action);
+                        break;
+                }
                 if (!(adapter->nameserver_port)) {
                         retval = zfcp_nameserver_enqueue(adapter);
                         if (retval != 0) {
@@ -3516,8 +3533,9 @@ zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter)
         debug_text_event(adapter->erp_dbf, 3, "a_access_unblock");
         debug_event(adapter->erp_dbf, 3, &adapter->name, 8);
 
-        zfcp_erp_port_access_changed(adapter->nameserver_port);
         read_lock_irqsave(&zfcp_data.config_lock, flags);
+        if (adapter->nameserver_port)
+                zfcp_erp_port_access_changed(adapter->nameserver_port);
         list_for_each_entry(port, &adapter->port_list_head, list)
                 if (port != adapter->nameserver_port)
                         zfcp_erp_port_access_changed(port);