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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright(c) 2009 Intel Corporation. All rights reserved.4 *5 * Maintained at www.Open-FCoE.org6 */7 8/*9 * NPIV VN_Port helper functions for libfc10 */11 12#include <scsi/libfc.h>13#include <linux/export.h>14 15/**16 * libfc_vport_create() - Create a new NPIV vport instance17 * @vport: fc_vport structure from scsi_transport_fc18 * @privsize: driver private data size to allocate along with the Scsi_Host19 */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 ID44 * @n_port: Top level N_Port which may have multiple NPIV VN_Ports45 * @port_id: Fabric ID to find a match for46 *47 * Returns: matching lport pointer or NULL if there is no match48 */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's75 * 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_Port77 * 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_Port86 * @n_port: parent N_Port87 * @vn_port: VN_Port to update88 *89 * Locking: must be called with both the N_Port and VN_Port lp_mutex held90 */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_Port115 * @vn_port: virtual port to update116 */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 vports133 * @n_port: Parent N_Port that has changed state134 *135 * Locking: called with the n_port lp_mutex held136 */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}147 148