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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright(c) 2009 Intel Corporation. All rights reserved.
4 *
5 * Maintained at www.Open-FCoE.org
6 */
7
8/*
9 * NPIV VN_Port helper functions for libfc
10 */
11
12#include <scsi/libfc.h>
13#include <linux/export.h>
14
15/**
16 * libfc_vport_create() - Create a new NPIV vport instance
17 * @vport: fc_vport structure from scsi_transport_fc
18 * @privsize: driver private data size to allocate along with the Scsi_Host
19 */
20
21struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
22{
23 struct Scsi_Host *shost = vport_to_shost(vport);
24 struct fc_lport *n_port = shost_priv(shost);
25 struct fc_lport *vn_port;
26
27 vn_port = libfc_host_alloc(shost->hostt, privsize);
28 if (!vn_port)
29 return vn_port;
30
31 vn_port->vport = vport;
32 vport->dd_data = vn_port;
33
34 mutex_lock(&n_port->lp_mutex);
35 list_add_tail(&vn_port->list, &n_port->vports);
36 mutex_unlock(&n_port->lp_mutex);
37
38 return vn_port;
39}
40EXPORT_SYMBOL(libfc_vport_create);
41
42/**
43 * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
44 * @n_port: Top level N_Port which may have multiple NPIV VN_Ports
45 * @port_id: Fabric ID to find a match for
46 *
47 * Returns: matching lport pointer or NULL if there is no match
48 */
49struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
50{
51 struct fc_lport *lport = NULL;
52 struct fc_lport *vn_port;
53
54 if (n_port->port_id == port_id)
55 return n_port;
56
57 if (port_id == FC_FID_FLOGI)
58 return n_port; /* for point-to-point */
59
60 mutex_lock(&n_port->lp_mutex);
61 list_for_each_entry(vn_port, &n_port->vports, list) {
62 if (vn_port->port_id == port_id) {
63 lport = vn_port;
64 break;
65 }
66 }
67 mutex_unlock(&n_port->lp_mutex);
68
69 return lport;
70}
71EXPORT_SYMBOL(fc_vport_id_lookup);
72
73/*
74 * When setting the link state of vports during an lport state change, it's
75 * necessary to hold the lp_mutex of both the N_Port and the VN_Port.
76 * This tells the lockdep engine to treat the nested locking of the VN_Port
77 * as a different lock class.
78 */
79enum libfc_lport_mutex_class {
80 LPORT_MUTEX_NORMAL = 0,
81 LPORT_MUTEX_VN_PORT = 1,
82};
83
84/**
85 * __fc_vport_setlink() - update link and status on a VN_Port
86 * @n_port: parent N_Port
87 * @vn_port: VN_Port to update
88 *
89 * Locking: must be called with both the N_Port and VN_Port lp_mutex held
90 */
91static void __fc_vport_setlink(struct fc_lport *n_port,
92 struct fc_lport *vn_port)
93{
94 struct fc_vport *vport = vn_port->vport;
95
96 if (vn_port->state == LPORT_ST_DISABLED)
97 return;
98
99 if (n_port->state == LPORT_ST_READY) {
100 if (n_port->npiv_enabled) {
101 fc_vport_set_state(vport, FC_VPORT_INITIALIZING);
102 __fc_linkup(vn_port);
103 } else {
104 fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
105 __fc_linkdown(vn_port);
106 }
107 } else {
108 fc_vport_set_state(vport, FC_VPORT_LINKDOWN);
109 __fc_linkdown(vn_port);
110 }
111}
112
113/**
114 * fc_vport_setlink() - update link and status on a VN_Port
115 * @vn_port: virtual port to update
116 */
117void fc_vport_setlink(struct fc_lport *vn_port)
118{
119 struct fc_vport *vport = vn_port->vport;
120 struct Scsi_Host *shost = vport_to_shost(vport);
121 struct fc_lport *n_port = shost_priv(shost);
122
123 mutex_lock(&n_port->lp_mutex);
124 mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
125 __fc_vport_setlink(n_port, vn_port);
126 mutex_unlock(&vn_port->lp_mutex);
127 mutex_unlock(&n_port->lp_mutex);
128}
129EXPORT_SYMBOL(fc_vport_setlink);
130
131/**
132 * fc_vports_linkchange() - change the link state of all vports
133 * @n_port: Parent N_Port that has changed state
134 *
135 * Locking: called with the n_port lp_mutex held
136 */
137void fc_vports_linkchange(struct fc_lport *n_port)
138{
139 struct fc_lport *vn_port;
140
141 list_for_each_entry(vn_port, &n_port->vports, list) {
142 mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
143 __fc_vport_setlink(n_port, vn_port);
144 mutex_unlock(&vn_port->lp_mutex);
145 }
146}
147
1/*
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>
25
26/**
27 * fc_vport_create() - Create a new NPIV vport instance
28 * @vport: fc_vport structure from scsi_transport_fc
29 * @privsize: driver private data size to allocate along with the Scsi_Host
30 */
31
32struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
33{
34 struct Scsi_Host *shost = vport_to_shost(vport);
35 struct fc_lport *n_port = shost_priv(shost);
36 struct fc_lport *vn_port;
37
38 vn_port = libfc_host_alloc(shost->hostt, privsize);
39 if (!vn_port)
40 return vn_port;
41
42 vn_port->vport = vport;
43 vport->dd_data = vn_port;
44
45 mutex_lock(&n_port->lp_mutex);
46 list_add_tail(&vn_port->list, &n_port->vports);
47 mutex_unlock(&n_port->lp_mutex);
48
49 return vn_port;
50}
51EXPORT_SYMBOL(libfc_vport_create);
52
53/**
54 * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
55 * @n_port: Top level N_Port which may have multiple NPIV VN_Ports
56 * @port_id: Fabric ID to find a match for
57 *
58 * Returns: matching lport pointer or NULL if there is no match
59 */
60struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
61{
62 struct fc_lport *lport = NULL;
63 struct fc_lport *vn_port;
64
65 if (n_port->port_id == port_id)
66 return n_port;
67
68 if (port_id == FC_FID_FLOGI)
69 return n_port; /* for point-to-point */
70
71 mutex_lock(&n_port->lp_mutex);
72 list_for_each_entry(vn_port, &n_port->vports, list) {
73 if (vn_port->port_id == port_id) {
74 lport = vn_port;
75 break;
76 }
77 }
78 mutex_unlock(&n_port->lp_mutex);
79
80 return lport;
81}
82EXPORT_SYMBOL(fc_vport_id_lookup);
83
84/*
85 * When setting the link state of vports during an lport state change, it's
86 * necessary to hold the lp_mutex of both the N_Port and the VN_Port.
87 * This tells the lockdep engine to treat the nested locking of the VN_Port
88 * as a different lock class.
89 */
90enum libfc_lport_mutex_class {
91 LPORT_MUTEX_NORMAL = 0,
92 LPORT_MUTEX_VN_PORT = 1,
93};
94
95/**
96 * __fc_vport_setlink() - update link and status on a VN_Port
97 * @n_port: parent N_Port
98 * @vn_port: VN_Port to update
99 *
100 * Locking: must be called with both the N_Port and VN_Port lp_mutex held
101 */
102static void __fc_vport_setlink(struct fc_lport *n_port,
103 struct fc_lport *vn_port)
104{
105 struct fc_vport *vport = vn_port->vport;
106
107 if (vn_port->state == LPORT_ST_DISABLED)
108 return;
109
110 if (n_port->state == LPORT_ST_READY) {
111 if (n_port->npiv_enabled) {
112 fc_vport_set_state(vport, FC_VPORT_INITIALIZING);
113 __fc_linkup(vn_port);
114 } else {
115 fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
116 __fc_linkdown(vn_port);
117 }
118 } else {
119 fc_vport_set_state(vport, FC_VPORT_LINKDOWN);
120 __fc_linkdown(vn_port);
121 }
122}
123
124/**
125 * fc_vport_setlink() - update link and status on a VN_Port
126 * @vn_port: virtual port to update
127 */
128void fc_vport_setlink(struct fc_lport *vn_port)
129{
130 struct fc_vport *vport = vn_port->vport;
131 struct Scsi_Host *shost = vport_to_shost(vport);
132 struct fc_lport *n_port = shost_priv(shost);
133
134 mutex_lock(&n_port->lp_mutex);
135 mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
136 __fc_vport_setlink(n_port, vn_port);
137 mutex_unlock(&vn_port->lp_mutex);
138 mutex_unlock(&n_port->lp_mutex);
139}
140EXPORT_SYMBOL(fc_vport_setlink);
141
142/**
143 * fc_vports_linkchange() - change the link state of all vports
144 * @n_port: Parent N_Port that has changed state
145 *
146 * Locking: called with the n_port lp_mutex held
147 */
148void fc_vports_linkchange(struct fc_lport *n_port)
149{
150 struct fc_lport *vn_port;
151
152 list_for_each_entry(vn_port, &n_port->vports, list) {
153 mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
154 __fc_vport_setlink(n_port, vn_port);
155 mutex_unlock(&vn_port->lp_mutex);
156 }
157}
158