Merge branch 'wip-2.6.34' into old-private-masterarchived-private-master

1 files changed, 161 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_npiv.c b/drivers/scsi/libfc/fc_npiv.c
new file mode 100644
index 000000000000..c68f6c7341c2
--- /dev/null
+++ b/drivers/scsi/libfc/fc_npiv.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright(c) 2009 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * NPIV VN_Port helper functions for libfc
+ */
+
+#include <scsi/libfc.h>
+
+/**
+ * fc_vport_create() - Create a new NPIV vport instance
+ * @vport: fc_vport structure from scsi_transport_fc
+ * @privsize: driver private data size to allocate along with the Scsi_Host
+ */
+
+struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
+{
+        struct Scsi_Host *shost = vport_to_shost(vport);
+        struct fc_lport *n_port = shost_priv(shost);
+        struct fc_lport *vn_port;
+
+        vn_port = libfc_host_alloc(shost->hostt, privsize);
+        if (!vn_port)
+                goto err_out;
+        if (fc_exch_mgr_list_clone(n_port, vn_port))
+                goto err_put;
+
+        vn_port->vport = vport;
+        vport->dd_data = vn_port;
+
+        mutex_lock(&n_port->lp_mutex);
+        list_add_tail(&vn_port->list, &n_port->vports);
+        mutex_unlock(&n_port->lp_mutex);
+
+        return vn_port;
+
+err_put:
+        scsi_host_put(vn_port->host);
+err_out:
+        return NULL;
+}
+EXPORT_SYMBOL(libfc_vport_create);
+
+/**
+ * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
+ * @n_port: Top level N_Port which may have multiple NPIV VN_Ports
+ * @port_id: Fabric ID to find a match for
+ *
+ * Returns: matching lport pointer or NULL if there is no match
+ */
+struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
+{
+        struct fc_lport *lport = NULL;
+        struct fc_lport *vn_port;
+
+        if (fc_host_port_id(n_port->host) == port_id)
+                return n_port;
+
+        mutex_lock(&n_port->lp_mutex);
+        list_for_each_entry(vn_port, &n_port->vports, list) {
+                if (fc_host_port_id(vn_port->host) == port_id) {
+                        lport = vn_port;
+                        break;
+                }
+        }
+        mutex_unlock(&n_port->lp_mutex);
+
+        return lport;
+}
+
+/*
+ * When setting the link state of vports during an lport state change, it's
+ * necessary to hold the lp_mutex of both the N_Port and the VN_Port.
+ * This tells the lockdep engine to treat the nested locking of the VN_Port
+ * as a different lock class.
+ */
+enum libfc_lport_mutex_class {
+        LPORT_MUTEX_NORMAL = 0,
+        LPORT_MUTEX_VN_PORT = 1,
+};
+
+/**
+ * __fc_vport_setlink() - update link and status on a VN_Port
+ * @n_port: parent N_Port
+ * @vn_port: VN_Port to update
+ *
+ * Locking: must be called with both the N_Port and VN_Port lp_mutex held
+ */
+static void __fc_vport_setlink(struct fc_lport *n_port,
+                               struct fc_lport *vn_port)
+{
+        struct fc_vport *vport = vn_port->vport;
+
+        if (vn_port->state == LPORT_ST_DISABLED)
+                return;
+
+        if (n_port->state == LPORT_ST_READY) {
+                if (n_port->npiv_enabled) {
+                        fc_vport_set_state(vport, FC_VPORT_INITIALIZING);
+                        __fc_linkup(vn_port);
+                } else {
+                        fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
+                        __fc_linkdown(vn_port);
+                }
+        } else {
+                fc_vport_set_state(vport, FC_VPORT_LINKDOWN);
+                __fc_linkdown(vn_port);
+        }
+}
+
+/**
+ * fc_vport_setlink() - update link and status on a VN_Port
+ * @vn_port: virtual port to update
+ */
+void fc_vport_setlink(struct fc_lport *vn_port)
+{
+        struct fc_vport *vport = vn_port->vport;
+        struct Scsi_Host *shost = vport_to_shost(vport);
+        struct fc_lport *n_port = shost_priv(shost);
+
+        mutex_lock(&n_port->lp_mutex);
+        mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
+        __fc_vport_setlink(n_port, vn_port);
+        mutex_unlock(&vn_port->lp_mutex);
+        mutex_unlock(&n_port->lp_mutex);
+}
+EXPORT_SYMBOL(fc_vport_setlink);
+
+/**
+ * fc_vports_linkchange() - change the link state of all vports
+ * @n_port: Parent N_Port that has changed state
+ *
+ * Locking: called with the n_port lp_mutex held
+ */
+void fc_vports_linkchange(struct fc_lport *n_port)
+{
+        struct fc_lport *vn_port;
+
+        list_for_each_entry(vn_port, &n_port->vports, list) {
+                mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
+                __fc_vport_setlink(n_port, vn_port);
+                mutex_unlock(&vn_port->lp_mutex);
+        }
+}
+