Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 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 | |
| 32 | struct 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 | goto err_out; |
| 41 | if (fc_exch_mgr_list_clone(n_port, vn_port)) |
| 42 | goto err_put; |
| 43 | |
| 44 | vn_port->vport = vport; |
| 45 | vport->dd_data = vn_port; |
| 46 | |
| 47 | mutex_lock(&n_port->lp_mutex); |
| 48 | list_add_tail(&vn_port->list, &n_port->vports); |
| 49 | mutex_unlock(&n_port->lp_mutex); |
| 50 | |
| 51 | return vn_port; |
| 52 | |
| 53 | err_put: |
| 54 | scsi_host_put(vn_port->host); |
| 55 | err_out: |
| 56 | return NULL; |
| 57 | } |
| 58 | EXPORT_SYMBOL(libfc_vport_create); |
| 59 | |
| 60 | /** |
| 61 | * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID |
| 62 | * @n_port: Top level N_Port which may have multiple NPIV VN_Ports |
| 63 | * @port_id: Fabric ID to find a match for |
| 64 | * |
| 65 | * Returns: matching lport pointer or NULL if there is no match |
| 66 | */ |
| 67 | struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id) |
| 68 | { |
| 69 | struct fc_lport *lport = NULL; |
| 70 | struct fc_lport *vn_port; |
| 71 | |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 72 | if (n_port->port_id == port_id) |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 73 | return n_port; |
| 74 | |
Joe Eykholt | f4568b8 | 2010-03-12 16:08:07 -0800 | [diff] [blame] | 75 | if (port_id == FC_FID_FLOGI) |
| 76 | return n_port; /* for point-to-point */ |
| 77 | |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 78 | mutex_lock(&n_port->lp_mutex); |
| 79 | list_for_each_entry(vn_port, &n_port->vports, list) { |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 80 | if (vn_port->port_id == port_id) { |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 81 | lport = vn_port; |
| 82 | break; |
| 83 | } |
| 84 | } |
| 85 | mutex_unlock(&n_port->lp_mutex); |
| 86 | |
| 87 | return lport; |
| 88 | } |
| 89 | |
Chris Leech | 8faecdd | 2009-11-03 11:46:19 -0800 | [diff] [blame] | 90 | /* |
| 91 | * When setting the link state of vports during an lport state change, it's |
| 92 | * necessary to hold the lp_mutex of both the N_Port and the VN_Port. |
| 93 | * This tells the lockdep engine to treat the nested locking of the VN_Port |
| 94 | * as a different lock class. |
| 95 | */ |
| 96 | enum libfc_lport_mutex_class { |
| 97 | LPORT_MUTEX_NORMAL = 0, |
| 98 | LPORT_MUTEX_VN_PORT = 1, |
| 99 | }; |
| 100 | |
| 101 | /** |
| 102 | * __fc_vport_setlink() - update link and status on a VN_Port |
| 103 | * @n_port: parent N_Port |
| 104 | * @vn_port: VN_Port to update |
| 105 | * |
| 106 | * Locking: must be called with both the N_Port and VN_Port lp_mutex held |
| 107 | */ |
| 108 | static void __fc_vport_setlink(struct fc_lport *n_port, |
| 109 | struct fc_lport *vn_port) |
| 110 | { |
| 111 | struct fc_vport *vport = vn_port->vport; |
| 112 | |
| 113 | if (vn_port->state == LPORT_ST_DISABLED) |
| 114 | return; |
| 115 | |
| 116 | if (n_port->state == LPORT_ST_READY) { |
| 117 | if (n_port->npiv_enabled) { |
| 118 | fc_vport_set_state(vport, FC_VPORT_INITIALIZING); |
| 119 | __fc_linkup(vn_port); |
| 120 | } else { |
| 121 | fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP); |
| 122 | __fc_linkdown(vn_port); |
| 123 | } |
| 124 | } else { |
| 125 | fc_vport_set_state(vport, FC_VPORT_LINKDOWN); |
| 126 | __fc_linkdown(vn_port); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * fc_vport_setlink() - update link and status on a VN_Port |
| 132 | * @vn_port: virtual port to update |
| 133 | */ |
| 134 | void fc_vport_setlink(struct fc_lport *vn_port) |
| 135 | { |
| 136 | struct fc_vport *vport = vn_port->vport; |
| 137 | struct Scsi_Host *shost = vport_to_shost(vport); |
| 138 | struct fc_lport *n_port = shost_priv(shost); |
| 139 | |
| 140 | mutex_lock(&n_port->lp_mutex); |
| 141 | mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT); |
| 142 | __fc_vport_setlink(n_port, vn_port); |
| 143 | mutex_unlock(&vn_port->lp_mutex); |
| 144 | mutex_unlock(&n_port->lp_mutex); |
| 145 | } |
| 146 | EXPORT_SYMBOL(fc_vport_setlink); |
| 147 | |
| 148 | /** |
| 149 | * fc_vports_linkchange() - change the link state of all vports |
| 150 | * @n_port: Parent N_Port that has changed state |
| 151 | * |
| 152 | * Locking: called with the n_port lp_mutex held |
| 153 | */ |
| 154 | void fc_vports_linkchange(struct fc_lport *n_port) |
| 155 | { |
| 156 | struct fc_lport *vn_port; |
| 157 | |
| 158 | list_for_each_entry(vn_port, &n_port->vports, list) { |
| 159 | mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT); |
| 160 | __fc_vport_setlink(n_port, vn_port); |
| 161 | mutex_unlock(&vn_port->lp_mutex); |
| 162 | } |
| 163 | } |
| 164 | |