blob: 9fbf78ed821b3ceeb36a941e5fddd3142d0300cf [file] [log] [blame]
Chris Leech174e1eb2009-11-03 11:46:14 -08001/*
2 * Copyright(c) 2009 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20/*
21 * NPIV VN_Port helper functions for libfc
22 */
23
24#include <scsi/libfc.h>
Paul Gortmaker09703662011-05-27 09:37:25 -040025#include <linux/export.h>
Chris Leech174e1eb2009-11-03 11:46:14 -080026
27/**
28 * fc_vport_create() - Create a new NPIV vport instance
29 * @vport: fc_vport structure from scsi_transport_fc
30 * @privsize: driver private data size to allocate along with the Scsi_Host
31 */
32
33struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
34{
35 struct Scsi_Host *shost = vport_to_shost(vport);
36 struct fc_lport *n_port = shost_priv(shost);
37 struct fc_lport *vn_port;
38
39 vn_port = libfc_host_alloc(shost->hostt, privsize);
40 if (!vn_port)
Vasu Dev72fa3962011-02-25 15:03:01 -080041 return vn_port;
Chris Leech174e1eb2009-11-03 11:46:14 -080042
43 vn_port->vport = vport;
44 vport->dd_data = vn_port;
45
46 mutex_lock(&n_port->lp_mutex);
47 list_add_tail(&vn_port->list, &n_port->vports);
48 mutex_unlock(&n_port->lp_mutex);
49
50 return vn_port;
Chris Leech174e1eb2009-11-03 11:46:14 -080051}
52EXPORT_SYMBOL(libfc_vport_create);
53
54/**
55 * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
56 * @n_port: Top level N_Port which may have multiple NPIV VN_Ports
57 * @port_id: Fabric ID to find a match for
58 *
59 * Returns: matching lport pointer or NULL if there is no match
60 */
61struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
62{
63 struct fc_lport *lport = NULL;
64 struct fc_lport *vn_port;
65
Robert Love7b2787e2010-05-07 15:18:41 -070066 if (n_port->port_id == port_id)
Chris Leech174e1eb2009-11-03 11:46:14 -080067 return n_port;
68
Joe Eykholtf4568b82010-03-12 16:08:07 -080069 if (port_id == FC_FID_FLOGI)
70 return n_port; /* for point-to-point */
71
Chris Leech174e1eb2009-11-03 11:46:14 -080072 mutex_lock(&n_port->lp_mutex);
73 list_for_each_entry(vn_port, &n_port->vports, list) {
Robert Love7b2787e2010-05-07 15:18:41 -070074 if (vn_port->port_id == port_id) {
Chris Leech174e1eb2009-11-03 11:46:14 -080075 lport = vn_port;
76 break;
77 }
78 }
79 mutex_unlock(&n_port->lp_mutex);
80
81 return lport;
82}
Bhanu Prakash Gollapudi75a27922011-01-28 16:05:27 -080083EXPORT_SYMBOL(fc_vport_id_lookup);
Chris Leech174e1eb2009-11-03 11:46:14 -080084
Chris Leech8faecdd2009-11-03 11:46:19 -080085/*
86 * When setting the link state of vports during an lport state change, it's
87 * necessary to hold the lp_mutex of both the N_Port and the VN_Port.
88 * This tells the lockdep engine to treat the nested locking of the VN_Port
89 * as a different lock class.
90 */
91enum libfc_lport_mutex_class {
92 LPORT_MUTEX_NORMAL = 0,
93 LPORT_MUTEX_VN_PORT = 1,
94};
95
96/**
97 * __fc_vport_setlink() - update link and status on a VN_Port
98 * @n_port: parent N_Port
99 * @vn_port: VN_Port to update
100 *
101 * Locking: must be called with both the N_Port and VN_Port lp_mutex held
102 */
103static void __fc_vport_setlink(struct fc_lport *n_port,
104 struct fc_lport *vn_port)
105{
106 struct fc_vport *vport = vn_port->vport;
107
108 if (vn_port->state == LPORT_ST_DISABLED)
109 return;
110
111 if (n_port->state == LPORT_ST_READY) {
112 if (n_port->npiv_enabled) {
113 fc_vport_set_state(vport, FC_VPORT_INITIALIZING);
114 __fc_linkup(vn_port);
115 } else {
116 fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
117 __fc_linkdown(vn_port);
118 }
119 } else {
120 fc_vport_set_state(vport, FC_VPORT_LINKDOWN);
121 __fc_linkdown(vn_port);
122 }
123}
124
125/**
126 * fc_vport_setlink() - update link and status on a VN_Port
127 * @vn_port: virtual port to update
128 */
129void fc_vport_setlink(struct fc_lport *vn_port)
130{
131 struct fc_vport *vport = vn_port->vport;
132 struct Scsi_Host *shost = vport_to_shost(vport);
133 struct fc_lport *n_port = shost_priv(shost);
134
135 mutex_lock(&n_port->lp_mutex);
136 mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
137 __fc_vport_setlink(n_port, vn_port);
138 mutex_unlock(&vn_port->lp_mutex);
139 mutex_unlock(&n_port->lp_mutex);
140}
141EXPORT_SYMBOL(fc_vport_setlink);
142
143/**
144 * fc_vports_linkchange() - change the link state of all vports
145 * @n_port: Parent N_Port that has changed state
146 *
147 * Locking: called with the n_port lp_mutex held
148 */
149void fc_vports_linkchange(struct fc_lport *n_port)
150{
151 struct fc_lport *vn_port;
152
153 list_for_each_entry(vn_port, &n_port->vports, list) {
154 mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
155 __fc_vport_setlink(n_port, vn_port);
156 mutex_unlock(&vn_port->lp_mutex);
157 }
158}
159