![Satish Kharat](/assets/img/avatar_default.png)
In places like fc_rport_recv_plogi_req and fcoe_ctlr_vn_add we always take the lport disc_mutex lock before the rports mutex (rp_mutex) lock. Gaurding list_del_rcu(&rdata->peers) with disc.disc_mutex in fc_rport_work is correct but the rp_mutex lock can and should to be dropped before taking that lock else results in a deadlock. Signed-off-by: Satish Kharat <satishkh@cisco.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2290 lines
61 KiB
C
2290 lines
61 KiB
C
/*
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* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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/*
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* RPORT GENERAL INFO
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*
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* This file contains all processing regarding fc_rports. It contains the
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* rport state machine and does all rport interaction with the transport class.
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* There should be no other places in libfc that interact directly with the
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* transport class in regards to adding and deleting rports.
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*
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* fc_rport's represent N_Port's within the fabric.
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*/
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/*
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* RPORT LOCKING
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*
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* The rport should never hold the rport mutex and then attempt to acquire
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* either the lport or disc mutexes. The rport's mutex is considered lesser
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* than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
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* more comments on the hierarchy.
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*
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* The locking strategy is similar to the lport's strategy. The lock protects
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* the rport's states and is held and released by the entry points to the rport
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* block. All _enter_* functions correspond to rport states and expect the rport
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* mutex to be locked before calling them. This means that rports only handle
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* one request or response at a time, since they're not critical for the I/O
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* path this potential over-use of the mutex is acceptable.
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*/
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/*
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* RPORT REFERENCE COUNTING
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*
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* A rport reference should be taken when:
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* - an rport is allocated
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* - a workqueue item is scheduled
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* - an ELS request is send
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* The reference should be dropped when:
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* - the workqueue function has finished
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* - the ELS response is handled
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* - an rport is removed
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*/
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <linux/export.h>
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#include <linux/rculist.h>
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#include <asm/unaligned.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_encode.h>
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#include "fc_libfc.h"
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static struct workqueue_struct *rport_event_queue;
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static void fc_rport_enter_flogi(struct fc_rport_priv *);
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static void fc_rport_enter_plogi(struct fc_rport_priv *);
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static void fc_rport_enter_prli(struct fc_rport_priv *);
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static void fc_rport_enter_rtv(struct fc_rport_priv *);
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static void fc_rport_enter_ready(struct fc_rport_priv *);
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static void fc_rport_enter_logo(struct fc_rport_priv *);
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static void fc_rport_enter_adisc(struct fc_rport_priv *);
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static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
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static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
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static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
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static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
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static void fc_rport_timeout(struct work_struct *);
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static void fc_rport_error(struct fc_rport_priv *, int);
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static void fc_rport_error_retry(struct fc_rport_priv *, int);
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static void fc_rport_work(struct work_struct *);
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static const char *fc_rport_state_names[] = {
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[RPORT_ST_INIT] = "Init",
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[RPORT_ST_FLOGI] = "FLOGI",
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[RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
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[RPORT_ST_PLOGI] = "PLOGI",
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[RPORT_ST_PRLI] = "PRLI",
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[RPORT_ST_RTV] = "RTV",
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[RPORT_ST_READY] = "Ready",
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[RPORT_ST_ADISC] = "ADISC",
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[RPORT_ST_DELETE] = "Delete",
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};
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/**
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* fc_rport_lookup() - Lookup a remote port by port_id
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* @lport: The local port to lookup the remote port on
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* @port_id: The remote port ID to look up
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*
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* The reference count of the fc_rport_priv structure is
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* increased by one.
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*/
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struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
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u32 port_id)
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{
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struct fc_rport_priv *rdata = NULL, *tmp_rdata;
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rcu_read_lock();
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list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers)
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if (tmp_rdata->ids.port_id == port_id &&
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kref_get_unless_zero(&tmp_rdata->kref)) {
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rdata = tmp_rdata;
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break;
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}
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rcu_read_unlock();
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return rdata;
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}
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EXPORT_SYMBOL(fc_rport_lookup);
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/**
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* fc_rport_create() - Create a new remote port
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* @lport: The local port this remote port will be associated with
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* @ids: The identifiers for the new remote port
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*
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* The remote port will start in the INIT state.
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*
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* Locking note: must be called with the disc_mutex held.
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*/
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struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
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{
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struct fc_rport_priv *rdata;
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rdata = fc_rport_lookup(lport, port_id);
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if (rdata)
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return rdata;
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rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL);
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if (!rdata)
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return NULL;
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rdata->ids.node_name = -1;
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rdata->ids.port_name = -1;
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rdata->ids.port_id = port_id;
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rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
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kref_init(&rdata->kref);
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mutex_init(&rdata->rp_mutex);
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rdata->local_port = lport;
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rdata->rp_state = RPORT_ST_INIT;
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rdata->event = RPORT_EV_NONE;
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rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
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rdata->e_d_tov = lport->e_d_tov;
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rdata->r_a_tov = lport->r_a_tov;
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rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
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INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
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INIT_WORK(&rdata->event_work, fc_rport_work);
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if (port_id != FC_FID_DIR_SERV) {
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rdata->lld_event_callback = lport->tt.rport_event_callback;
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list_add_rcu(&rdata->peers, &lport->disc.rports);
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}
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return rdata;
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}
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EXPORT_SYMBOL(fc_rport_create);
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/**
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* fc_rport_destroy() - Free a remote port after last reference is released
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* @kref: The remote port's kref
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*/
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void fc_rport_destroy(struct kref *kref)
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{
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struct fc_rport_priv *rdata;
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rdata = container_of(kref, struct fc_rport_priv, kref);
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kfree_rcu(rdata, rcu);
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}
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EXPORT_SYMBOL(fc_rport_destroy);
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/**
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* fc_rport_state() - Return a string identifying the remote port's state
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* @rdata: The remote port
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*/
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static const char *fc_rport_state(struct fc_rport_priv *rdata)
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{
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const char *cp;
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cp = fc_rport_state_names[rdata->rp_state];
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if (!cp)
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cp = "Unknown";
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return cp;
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}
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/**
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* fc_set_rport_loss_tmo() - Set the remote port loss timeout
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* @rport: The remote port that gets a new timeout value
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* @timeout: The new timeout value (in seconds)
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*/
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void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
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{
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if (timeout)
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rport->dev_loss_tmo = timeout;
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else
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rport->dev_loss_tmo = 1;
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}
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EXPORT_SYMBOL(fc_set_rport_loss_tmo);
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/**
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* fc_plogi_get_maxframe() - Get the maximum payload from the common service
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* parameters in a FLOGI frame
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* @flp: The FLOGI or PLOGI payload
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* @maxval: The maximum frame size upper limit; this may be less than what
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* is in the service parameters
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*/
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static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
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unsigned int maxval)
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{
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unsigned int mfs;
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/*
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* Get max payload from the common service parameters and the
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* class 3 receive data field size.
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*/
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mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
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if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
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maxval = mfs;
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mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
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if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
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maxval = mfs;
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return maxval;
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}
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/**
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* fc_rport_state_enter() - Change the state of a remote port
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* @rdata: The remote port whose state should change
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* @new: The new state
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*
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* Locking Note: Called with the rport lock held
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*/
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static void fc_rport_state_enter(struct fc_rport_priv *rdata,
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enum fc_rport_state new)
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{
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if (rdata->rp_state != new)
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rdata->retries = 0;
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rdata->rp_state = new;
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}
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/**
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* fc_rport_work() - Handler for remote port events in the rport_event_queue
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* @work: Handle to the remote port being dequeued
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*
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* Reference counting: drops kref on return
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*/
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static void fc_rport_work(struct work_struct *work)
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{
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u32 port_id;
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struct fc_rport_priv *rdata =
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container_of(work, struct fc_rport_priv, event_work);
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struct fc_rport_libfc_priv *rpriv;
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enum fc_rport_event event;
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struct fc_lport *lport = rdata->local_port;
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struct fc_rport_operations *rport_ops;
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struct fc_rport_identifiers ids;
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struct fc_rport *rport;
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struct fc4_prov *prov;
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u8 type;
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mutex_lock(&rdata->rp_mutex);
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event = rdata->event;
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rport_ops = rdata->ops;
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rport = rdata->rport;
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FC_RPORT_DBG(rdata, "work event %u\n", event);
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switch (event) {
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case RPORT_EV_READY:
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ids = rdata->ids;
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rdata->event = RPORT_EV_NONE;
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rdata->major_retries = 0;
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kref_get(&rdata->kref);
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mutex_unlock(&rdata->rp_mutex);
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if (!rport) {
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FC_RPORT_DBG(rdata, "No rport!\n");
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rport = fc_remote_port_add(lport->host, 0, &ids);
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}
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if (!rport) {
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FC_RPORT_DBG(rdata, "Failed to add the rport\n");
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fc_rport_logoff(rdata);
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kref_put(&rdata->kref, fc_rport_destroy);
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return;
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}
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mutex_lock(&rdata->rp_mutex);
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if (rdata->rport)
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FC_RPORT_DBG(rdata, "rport already allocated\n");
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rdata->rport = rport;
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rport->maxframe_size = rdata->maxframe_size;
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rport->supported_classes = rdata->supported_classes;
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rpriv = rport->dd_data;
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rpriv->local_port = lport;
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rpriv->rp_state = rdata->rp_state;
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rpriv->flags = rdata->flags;
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rpriv->e_d_tov = rdata->e_d_tov;
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rpriv->r_a_tov = rdata->r_a_tov;
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mutex_unlock(&rdata->rp_mutex);
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if (rport_ops && rport_ops->event_callback) {
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FC_RPORT_DBG(rdata, "callback ev %d\n", event);
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rport_ops->event_callback(lport, rdata, event);
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}
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if (rdata->lld_event_callback) {
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FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
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rdata->lld_event_callback(lport, rdata, event);
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}
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kref_put(&rdata->kref, fc_rport_destroy);
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break;
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case RPORT_EV_FAILED:
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case RPORT_EV_LOGO:
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case RPORT_EV_STOP:
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if (rdata->prli_count) {
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mutex_lock(&fc_prov_mutex);
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for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
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prov = fc_passive_prov[type];
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if (prov && prov->prlo)
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prov->prlo(rdata);
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}
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mutex_unlock(&fc_prov_mutex);
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}
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port_id = rdata->ids.port_id;
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mutex_unlock(&rdata->rp_mutex);
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if (rport_ops && rport_ops->event_callback) {
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FC_RPORT_DBG(rdata, "callback ev %d\n", event);
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rport_ops->event_callback(lport, rdata, event);
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}
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if (rdata->lld_event_callback) {
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FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
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rdata->lld_event_callback(lport, rdata, event);
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}
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if (cancel_delayed_work_sync(&rdata->retry_work))
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kref_put(&rdata->kref, fc_rport_destroy);
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/*
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* Reset any outstanding exchanges before freeing rport.
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*/
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lport->tt.exch_mgr_reset(lport, 0, port_id);
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lport->tt.exch_mgr_reset(lport, port_id, 0);
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if (rport) {
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rpriv = rport->dd_data;
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rpriv->rp_state = RPORT_ST_DELETE;
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mutex_lock(&rdata->rp_mutex);
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rdata->rport = NULL;
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mutex_unlock(&rdata->rp_mutex);
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fc_remote_port_delete(rport);
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}
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mutex_lock(&rdata->rp_mutex);
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if (rdata->rp_state == RPORT_ST_DELETE) {
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if (port_id == FC_FID_DIR_SERV) {
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rdata->event = RPORT_EV_NONE;
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mutex_unlock(&rdata->rp_mutex);
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kref_put(&rdata->kref, fc_rport_destroy);
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} else if ((rdata->flags & FC_RP_STARTED) &&
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rdata->major_retries <
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lport->max_rport_retry_count) {
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rdata->major_retries++;
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rdata->event = RPORT_EV_NONE;
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FC_RPORT_DBG(rdata, "work restart\n");
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fc_rport_enter_flogi(rdata);
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mutex_unlock(&rdata->rp_mutex);
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} else {
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mutex_unlock(&rdata->rp_mutex);
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FC_RPORT_DBG(rdata, "work delete\n");
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mutex_lock(&lport->disc.disc_mutex);
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list_del_rcu(&rdata->peers);
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mutex_unlock(&lport->disc.disc_mutex);
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kref_put(&rdata->kref, fc_rport_destroy);
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}
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} else {
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/*
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* Re-open for events. Reissue READY event if ready.
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*/
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rdata->event = RPORT_EV_NONE;
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if (rdata->rp_state == RPORT_ST_READY) {
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FC_RPORT_DBG(rdata, "work reopen\n");
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fc_rport_enter_ready(rdata);
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}
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mutex_unlock(&rdata->rp_mutex);
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}
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break;
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default:
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mutex_unlock(&rdata->rp_mutex);
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break;
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}
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kref_put(&rdata->kref, fc_rport_destroy);
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}
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/**
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* fc_rport_login() - Start the remote port login state machine
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* @rdata: The remote port to be logged in to
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*
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* Initiates the RP state machine. It is called from the LP module.
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* This function will issue the following commands to the N_Port
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* identified by the FC ID provided.
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*
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* - PLOGI
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* - PRLI
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* - RTV
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*
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* Locking Note: Called without the rport lock held. This
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* function will hold the rport lock, call an _enter_*
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* function and then unlock the rport.
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*
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* This indicates the intent to be logged into the remote port.
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* If it appears we are already logged in, ADISC is used to verify
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* the setup.
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*/
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int fc_rport_login(struct fc_rport_priv *rdata)
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{
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mutex_lock(&rdata->rp_mutex);
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if (rdata->flags & FC_RP_STARTED) {
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FC_RPORT_DBG(rdata, "port already started\n");
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mutex_unlock(&rdata->rp_mutex);
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return 0;
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}
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rdata->flags |= FC_RP_STARTED;
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switch (rdata->rp_state) {
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case RPORT_ST_READY:
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FC_RPORT_DBG(rdata, "ADISC port\n");
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fc_rport_enter_adisc(rdata);
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break;
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case RPORT_ST_DELETE:
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FC_RPORT_DBG(rdata, "Restart deleted port\n");
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break;
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case RPORT_ST_INIT:
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FC_RPORT_DBG(rdata, "Login to port\n");
|
|
fc_rport_enter_flogi(rdata);
|
|
break;
|
|
default:
|
|
FC_RPORT_DBG(rdata, "Login in progress, state %s\n",
|
|
fc_rport_state(rdata));
|
|
break;
|
|
}
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fc_rport_login);
|
|
|
|
/**
|
|
* fc_rport_enter_delete() - Schedule a remote port to be deleted
|
|
* @rdata: The remote port to be deleted
|
|
* @event: The event to report as the reason for deletion
|
|
*
|
|
* Locking Note: Called with the rport lock held.
|
|
*
|
|
* Allow state change into DELETE only once.
|
|
*
|
|
* Call queue_work only if there's no event already pending.
|
|
* Set the new event so that the old pending event will not occur.
|
|
* Since we have the mutex, even if fc_rport_work() is already started,
|
|
* it'll see the new event.
|
|
*
|
|
* Reference counting: does not modify kref
|
|
*/
|
|
static void fc_rport_enter_delete(struct fc_rport_priv *rdata,
|
|
enum fc_rport_event event)
|
|
{
|
|
if (rdata->rp_state == RPORT_ST_DELETE)
|
|
return;
|
|
|
|
FC_RPORT_DBG(rdata, "Delete port\n");
|
|
|
|
fc_rport_state_enter(rdata, RPORT_ST_DELETE);
|
|
|
|
kref_get(&rdata->kref);
|
|
if (rdata->event == RPORT_EV_NONE &&
|
|
!queue_work(rport_event_queue, &rdata->event_work))
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
|
|
rdata->event = event;
|
|
}
|
|
|
|
/**
|
|
* fc_rport_logoff() - Logoff and remove a remote port
|
|
* @rdata: The remote port to be logged off of
|
|
*
|
|
* Locking Note: Called without the rport lock held. This
|
|
* function will hold the rport lock, call an _enter_*
|
|
* function and then unlock the rport.
|
|
*/
|
|
int fc_rport_logoff(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
u32 port_id = rdata->ids.port_id;
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
FC_RPORT_DBG(rdata, "Remove port\n");
|
|
|
|
rdata->flags &= ~FC_RP_STARTED;
|
|
if (rdata->rp_state == RPORT_ST_DELETE) {
|
|
FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* FC-LS states:
|
|
* To explicitly Logout, the initiating Nx_Port shall terminate
|
|
* other open Sequences that it initiated with the destination
|
|
* Nx_Port prior to performing Logout.
|
|
*/
|
|
lport->tt.exch_mgr_reset(lport, 0, port_id);
|
|
lport->tt.exch_mgr_reset(lport, port_id, 0);
|
|
|
|
fc_rport_enter_logo(rdata);
|
|
|
|
/*
|
|
* Change the state to Delete so that we discard
|
|
* the response.
|
|
*/
|
|
fc_rport_enter_delete(rdata, RPORT_EV_STOP);
|
|
out:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fc_rport_logoff);
|
|
|
|
/**
|
|
* fc_rport_enter_ready() - Transition to the RPORT_ST_READY state
|
|
* @rdata: The remote port that is ready
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: schedules workqueue, does not modify kref
|
|
*/
|
|
static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
|
|
{
|
|
fc_rport_state_enter(rdata, RPORT_ST_READY);
|
|
|
|
FC_RPORT_DBG(rdata, "Port is Ready\n");
|
|
|
|
kref_get(&rdata->kref);
|
|
if (rdata->event == RPORT_EV_NONE &&
|
|
!queue_work(rport_event_queue, &rdata->event_work))
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
|
|
rdata->event = RPORT_EV_READY;
|
|
}
|
|
|
|
/**
|
|
* fc_rport_timeout() - Handler for the retry_work timer
|
|
* @work: Handle to the remote port that has timed out
|
|
*
|
|
* Locking Note: Called without the rport lock held. This
|
|
* function will hold the rport lock, call an _enter_*
|
|
* function and then unlock the rport.
|
|
*
|
|
* Reference counting: Drops kref on return.
|
|
*/
|
|
static void fc_rport_timeout(struct work_struct *work)
|
|
{
|
|
struct fc_rport_priv *rdata =
|
|
container_of(work, struct fc_rport_priv, retry_work.work);
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
FC_RPORT_DBG(rdata, "Port timeout, state %s\n", fc_rport_state(rdata));
|
|
|
|
switch (rdata->rp_state) {
|
|
case RPORT_ST_FLOGI:
|
|
fc_rport_enter_flogi(rdata);
|
|
break;
|
|
case RPORT_ST_PLOGI:
|
|
fc_rport_enter_plogi(rdata);
|
|
break;
|
|
case RPORT_ST_PRLI:
|
|
fc_rport_enter_prli(rdata);
|
|
break;
|
|
case RPORT_ST_RTV:
|
|
fc_rport_enter_rtv(rdata);
|
|
break;
|
|
case RPORT_ST_ADISC:
|
|
fc_rport_enter_adisc(rdata);
|
|
break;
|
|
case RPORT_ST_PLOGI_WAIT:
|
|
case RPORT_ST_READY:
|
|
case RPORT_ST_INIT:
|
|
case RPORT_ST_DELETE:
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_error() - Error handler, called once retries have been exhausted
|
|
* @rdata: The remote port the error is happened on
|
|
* @err: The error code
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before
|
|
* calling this routine
|
|
*
|
|
* Reference counting: does not modify kref
|
|
*/
|
|
static void fc_rport_error(struct fc_rport_priv *rdata, int err)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
|
|
FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n",
|
|
-err, fc_rport_state(rdata), rdata->retries);
|
|
|
|
switch (rdata->rp_state) {
|
|
case RPORT_ST_FLOGI:
|
|
rdata->flags &= ~FC_RP_STARTED;
|
|
fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
|
|
break;
|
|
case RPORT_ST_PLOGI:
|
|
if (lport->point_to_multipoint) {
|
|
rdata->flags &= ~FC_RP_STARTED;
|
|
fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
|
|
} else
|
|
fc_rport_enter_logo(rdata);
|
|
break;
|
|
case RPORT_ST_RTV:
|
|
fc_rport_enter_ready(rdata);
|
|
break;
|
|
case RPORT_ST_PRLI:
|
|
case RPORT_ST_ADISC:
|
|
fc_rport_enter_logo(rdata);
|
|
break;
|
|
case RPORT_ST_PLOGI_WAIT:
|
|
case RPORT_ST_DELETE:
|
|
case RPORT_ST_READY:
|
|
case RPORT_ST_INIT:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_rport_error_retry() - Handler for remote port state retries
|
|
* @rdata: The remote port whose state is to be retried
|
|
* @err: The error code
|
|
*
|
|
* If the error was an exchange timeout retry immediately,
|
|
* otherwise wait for E_D_TOV.
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before
|
|
* calling this routine
|
|
*
|
|
* Reference counting: increments kref when scheduling retry_work
|
|
*/
|
|
static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err)
|
|
{
|
|
unsigned long delay = msecs_to_jiffies(rdata->e_d_tov);
|
|
|
|
/* make sure this isn't an FC_EX_CLOSED error, never retry those */
|
|
if (err == -FC_EX_CLOSED)
|
|
goto out;
|
|
|
|
if (rdata->retries < rdata->local_port->max_rport_retry_count) {
|
|
FC_RPORT_DBG(rdata, "Error %d in state %s, retrying\n",
|
|
err, fc_rport_state(rdata));
|
|
rdata->retries++;
|
|
/* no additional delay on exchange timeouts */
|
|
if (err == -FC_EX_TIMEOUT)
|
|
delay = 0;
|
|
kref_get(&rdata->kref);
|
|
if (!schedule_delayed_work(&rdata->retry_work, delay))
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
return;
|
|
}
|
|
|
|
out:
|
|
fc_rport_error(rdata, err);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_login_complete() - Handle parameters and completion of p-mp login.
|
|
* @rdata: The remote port which we logged into or which logged into us.
|
|
* @fp: The FLOGI or PLOGI request or response frame
|
|
*
|
|
* Returns non-zero error if a problem is detected with the frame.
|
|
* Does not free the frame.
|
|
*
|
|
* This is only used in point-to-multipoint mode for FIP currently.
|
|
*/
|
|
static int fc_rport_login_complete(struct fc_rport_priv *rdata,
|
|
struct fc_frame *fp)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_els_flogi *flogi;
|
|
unsigned int e_d_tov;
|
|
u16 csp_flags;
|
|
|
|
flogi = fc_frame_payload_get(fp, sizeof(*flogi));
|
|
if (!flogi)
|
|
return -EINVAL;
|
|
|
|
csp_flags = ntohs(flogi->fl_csp.sp_features);
|
|
|
|
if (fc_frame_payload_op(fp) == ELS_FLOGI) {
|
|
if (csp_flags & FC_SP_FT_FPORT) {
|
|
FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
|
|
/*
|
|
* E_D_TOV is not valid on an incoming FLOGI request.
|
|
*/
|
|
e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov);
|
|
if (csp_flags & FC_SP_FT_EDTR)
|
|
e_d_tov /= 1000000;
|
|
if (e_d_tov > rdata->e_d_tov)
|
|
rdata->e_d_tov = e_d_tov;
|
|
}
|
|
rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode
|
|
* @sp: The sequence that the FLOGI was on
|
|
* @fp: The FLOGI response frame
|
|
* @rp_arg: The remote port that received the FLOGI response
|
|
*/
|
|
static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
|
|
void *rp_arg)
|
|
{
|
|
struct fc_rport_priv *rdata = rp_arg;
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_els_flogi *flogi;
|
|
unsigned int r_a_tov;
|
|
u8 opcode;
|
|
int err = 0;
|
|
|
|
FC_RPORT_DBG(rdata, "Received a FLOGI %s\n",
|
|
IS_ERR(fp) ? "error" : fc_els_resp_type(fp));
|
|
|
|
if (fp == ERR_PTR(-FC_EX_CLOSED))
|
|
goto put;
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
if (rdata->rp_state != RPORT_ST_FLOGI) {
|
|
FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state "
|
|
"%s\n", fc_rport_state(rdata));
|
|
if (IS_ERR(fp))
|
|
goto err;
|
|
goto out;
|
|
}
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_rport_error(rdata, PTR_ERR(fp));
|
|
goto err;
|
|
}
|
|
opcode = fc_frame_payload_op(fp);
|
|
if (opcode == ELS_LS_RJT) {
|
|
struct fc_els_ls_rjt *rjt;
|
|
|
|
rjt = fc_frame_payload_get(fp, sizeof(*rjt));
|
|
FC_RPORT_DBG(rdata, "FLOGI ELS rejected, reason %x expl %x\n",
|
|
rjt->er_reason, rjt->er_explan);
|
|
err = -FC_EX_ELS_RJT;
|
|
goto bad;
|
|
} else if (opcode != ELS_LS_ACC) {
|
|
FC_RPORT_DBG(rdata, "FLOGI ELS invalid opcode %x\n", opcode);
|
|
err = -FC_EX_ELS_RJT;
|
|
goto bad;
|
|
}
|
|
if (fc_rport_login_complete(rdata, fp)) {
|
|
FC_RPORT_DBG(rdata, "FLOGI failed, no login\n");
|
|
err = -FC_EX_INV_LOGIN;
|
|
goto bad;
|
|
}
|
|
|
|
flogi = fc_frame_payload_get(fp, sizeof(*flogi));
|
|
if (!flogi) {
|
|
err = -FC_EX_ALLOC_ERR;
|
|
goto bad;
|
|
}
|
|
r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov);
|
|
if (r_a_tov > rdata->r_a_tov)
|
|
rdata->r_a_tov = r_a_tov;
|
|
|
|
if (rdata->ids.port_name < lport->wwpn)
|
|
fc_rport_enter_plogi(rdata);
|
|
else
|
|
fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
|
|
out:
|
|
fc_frame_free(fp);
|
|
err:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
put:
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
return;
|
|
bad:
|
|
FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
|
|
fc_rport_error_retry(rdata, err);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp
|
|
* @rdata: The remote port to send a FLOGI to
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: increments kref when sending ELS
|
|
*/
|
|
static void fc_rport_enter_flogi(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
|
|
if (!lport->point_to_multipoint)
|
|
return fc_rport_enter_plogi(rdata);
|
|
|
|
FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fc_rport_state_enter(rdata, RPORT_ST_FLOGI);
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
|
|
if (!fp)
|
|
return fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
|
|
|
|
kref_get(&rdata->kref);
|
|
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI,
|
|
fc_rport_flogi_resp, rdata,
|
|
2 * lport->r_a_tov)) {
|
|
fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode
|
|
* @lport: The local port that received the PLOGI request
|
|
* @rx_fp: The PLOGI request frame
|
|
*
|
|
* Reference counting: drops kref on return
|
|
*/
|
|
static void fc_rport_recv_flogi_req(struct fc_lport *lport,
|
|
struct fc_frame *rx_fp)
|
|
{
|
|
struct fc_disc *disc;
|
|
struct fc_els_flogi *flp;
|
|
struct fc_rport_priv *rdata;
|
|
struct fc_frame *fp = rx_fp;
|
|
struct fc_seq_els_data rjt_data;
|
|
u32 sid;
|
|
|
|
sid = fc_frame_sid(fp);
|
|
|
|
FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n");
|
|
|
|
disc = &lport->disc;
|
|
if (!lport->point_to_multipoint) {
|
|
rjt_data.reason = ELS_RJT_UNSUP;
|
|
rjt_data.explan = ELS_EXPL_NONE;
|
|
goto reject;
|
|
}
|
|
|
|
flp = fc_frame_payload_get(fp, sizeof(*flp));
|
|
if (!flp) {
|
|
rjt_data.reason = ELS_RJT_LOGIC;
|
|
rjt_data.explan = ELS_EXPL_INV_LEN;
|
|
goto reject;
|
|
}
|
|
|
|
rdata = fc_rport_lookup(lport, sid);
|
|
if (!rdata) {
|
|
rjt_data.reason = ELS_RJT_FIP;
|
|
rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
|
|
goto reject;
|
|
}
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
switch (rdata->rp_state) {
|
|
case RPORT_ST_INIT:
|
|
/*
|
|
* If received the FLOGI request on RPORT which is INIT state
|
|
* (means not transition to FLOGI either fc_rport timeout
|
|
* function didn;t trigger or this end hasn;t received
|
|
* beacon yet from other end. In that case only, allow RPORT
|
|
* state machine to continue, otherwise fall through which
|
|
* causes the code to send reject response.
|
|
* NOTE; Not checking for FIP->state such as VNMP_UP or
|
|
* VNMP_CLAIM because if FIP state is not one of those,
|
|
* RPORT wouldn;t have created and 'rport_lookup' would have
|
|
* failed anyway in that case.
|
|
*/
|
|
break;
|
|
case RPORT_ST_DELETE:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
rjt_data.reason = ELS_RJT_FIP;
|
|
rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
|
|
goto reject_put;
|
|
case RPORT_ST_FLOGI:
|
|
case RPORT_ST_PLOGI_WAIT:
|
|
case RPORT_ST_PLOGI:
|
|
break;
|
|
case RPORT_ST_PRLI:
|
|
case RPORT_ST_RTV:
|
|
case RPORT_ST_READY:
|
|
case RPORT_ST_ADISC:
|
|
/*
|
|
* Set the remote port to be deleted and to then restart.
|
|
* This queues work to be sure exchanges are reset.
|
|
*/
|
|
fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
rjt_data.reason = ELS_RJT_BUSY;
|
|
rjt_data.explan = ELS_EXPL_NONE;
|
|
goto reject_put;
|
|
}
|
|
if (fc_rport_login_complete(rdata, fp)) {
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
rjt_data.reason = ELS_RJT_LOGIC;
|
|
rjt_data.explan = ELS_EXPL_NONE;
|
|
goto reject_put;
|
|
}
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(*flp));
|
|
if (!fp)
|
|
goto out;
|
|
|
|
fc_flogi_fill(lport, fp);
|
|
flp = fc_frame_payload_get(fp, sizeof(*flp));
|
|
flp->fl_cmd = ELS_LS_ACC;
|
|
|
|
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
|
|
/*
|
|
* Do not proceed with the state machine if our
|
|
* FLOGI has crossed with an FLOGI from the
|
|
* remote port; wait for the FLOGI response instead.
|
|
*/
|
|
if (rdata->rp_state != RPORT_ST_FLOGI) {
|
|
if (rdata->ids.port_name < lport->wwpn)
|
|
fc_rport_enter_plogi(rdata);
|
|
else
|
|
fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
|
|
}
|
|
out:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
fc_frame_free(rx_fp);
|
|
return;
|
|
|
|
reject_put:
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
reject:
|
|
fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
|
|
fc_frame_free(rx_fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_plogi_resp() - Handler for ELS PLOGI responses
|
|
* @sp: The sequence the PLOGI is on
|
|
* @fp: The PLOGI response frame
|
|
* @rdata_arg: The remote port that sent the PLOGI response
|
|
*
|
|
* Locking Note: This function will be called without the rport lock
|
|
* held, but it will lock, call an _enter_* function or fc_rport_error
|
|
* and then unlock the rport.
|
|
*/
|
|
static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
|
|
void *rdata_arg)
|
|
{
|
|
struct fc_rport_priv *rdata = rdata_arg;
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_els_flogi *plp = NULL;
|
|
u16 csp_seq;
|
|
u16 cssp_seq;
|
|
u8 op;
|
|
|
|
FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
|
|
|
|
if (fp == ERR_PTR(-FC_EX_CLOSED))
|
|
goto put;
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
if (rdata->rp_state != RPORT_ST_PLOGI) {
|
|
FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state "
|
|
"%s\n", fc_rport_state(rdata));
|
|
if (IS_ERR(fp))
|
|
goto err;
|
|
goto out;
|
|
}
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_rport_error_retry(rdata, PTR_ERR(fp));
|
|
goto err;
|
|
}
|
|
|
|
op = fc_frame_payload_op(fp);
|
|
if (op == ELS_LS_ACC &&
|
|
(plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
|
|
rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn);
|
|
rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn);
|
|
|
|
/* save plogi response sp_features for further reference */
|
|
rdata->sp_features = ntohs(plp->fl_csp.sp_features);
|
|
|
|
if (lport->point_to_multipoint)
|
|
fc_rport_login_complete(rdata, fp);
|
|
csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
|
|
cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
|
|
if (cssp_seq < csp_seq)
|
|
csp_seq = cssp_seq;
|
|
rdata->max_seq = csp_seq;
|
|
rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs);
|
|
fc_rport_enter_prli(rdata);
|
|
} else {
|
|
struct fc_els_ls_rjt *rjt;
|
|
|
|
rjt = fc_frame_payload_get(fp, sizeof(*rjt));
|
|
FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n",
|
|
rjt->er_reason, rjt->er_explan);
|
|
fc_rport_error_retry(rdata, -FC_EX_ELS_RJT);
|
|
}
|
|
out:
|
|
fc_frame_free(fp);
|
|
err:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
put:
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
static bool
|
|
fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata)
|
|
{
|
|
if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN)
|
|
return true;
|
|
if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) &&
|
|
(lport->service_params & FCP_SPPF_INIT_FCN))
|
|
return true;
|
|
if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) &&
|
|
(lport->service_params & FCP_SPPF_TARG_FCN))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* fc_rport_enter_plogi() - Send Port Login (PLOGI) request
|
|
* @rdata: The remote port to send a PLOGI to
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: increments kref when sending ELS
|
|
*/
|
|
static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
|
|
if (!fc_rport_compatible_roles(lport, rdata)) {
|
|
FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n");
|
|
fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT);
|
|
return;
|
|
}
|
|
|
|
FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fc_rport_state_enter(rdata, RPORT_ST_PLOGI);
|
|
|
|
rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
|
|
fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
|
|
if (!fp) {
|
|
FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__);
|
|
fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
|
|
return;
|
|
}
|
|
rdata->e_d_tov = lport->e_d_tov;
|
|
|
|
kref_get(&rdata->kref);
|
|
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI,
|
|
fc_rport_plogi_resp, rdata,
|
|
2 * lport->r_a_tov)) {
|
|
fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_rport_prli_resp() - Process Login (PRLI) response handler
|
|
* @sp: The sequence the PRLI response was on
|
|
* @fp: The PRLI response frame
|
|
* @rdata_arg: The remote port that sent the PRLI response
|
|
*
|
|
* Locking Note: This function will be called without the rport lock
|
|
* held, but it will lock, call an _enter_* function or fc_rport_error
|
|
* and then unlock the rport.
|
|
*/
|
|
static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
|
|
void *rdata_arg)
|
|
{
|
|
struct fc_rport_priv *rdata = rdata_arg;
|
|
struct {
|
|
struct fc_els_prli prli;
|
|
struct fc_els_spp spp;
|
|
} *pp;
|
|
struct fc_els_spp temp_spp;
|
|
struct fc_els_ls_rjt *rjt;
|
|
struct fc4_prov *prov;
|
|
u32 roles = FC_RPORT_ROLE_UNKNOWN;
|
|
u32 fcp_parm = 0;
|
|
u8 op;
|
|
enum fc_els_spp_resp resp_code;
|
|
|
|
FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
|
|
|
|
if (fp == ERR_PTR(-FC_EX_CLOSED))
|
|
goto put;
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
if (rdata->rp_state != RPORT_ST_PRLI) {
|
|
FC_RPORT_DBG(rdata, "Received a PRLI response, but in state "
|
|
"%s\n", fc_rport_state(rdata));
|
|
if (IS_ERR(fp))
|
|
goto err;
|
|
goto out;
|
|
}
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_rport_error_retry(rdata, PTR_ERR(fp));
|
|
goto err;
|
|
}
|
|
|
|
/* reinitialize remote port roles */
|
|
rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
|
|
|
|
op = fc_frame_payload_op(fp);
|
|
if (op == ELS_LS_ACC) {
|
|
pp = fc_frame_payload_get(fp, sizeof(*pp));
|
|
if (!pp)
|
|
goto out;
|
|
|
|
resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
|
|
FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n",
|
|
pp->spp.spp_flags, pp->spp.spp_type);
|
|
rdata->spp_type = pp->spp.spp_type;
|
|
if (resp_code != FC_SPP_RESP_ACK) {
|
|
if (resp_code == FC_SPP_RESP_CONF)
|
|
fc_rport_error(rdata, -FC_EX_SEQ_ERR);
|
|
else
|
|
fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
|
|
goto out;
|
|
}
|
|
if (pp->prli.prli_spp_len < sizeof(pp->spp))
|
|
goto out;
|
|
|
|
fcp_parm = ntohl(pp->spp.spp_params);
|
|
if (fcp_parm & FCP_SPPF_RETRY)
|
|
rdata->flags |= FC_RP_FLAGS_RETRY;
|
|
if (fcp_parm & FCP_SPPF_CONF_COMPL)
|
|
rdata->flags |= FC_RP_FLAGS_CONF_REQ;
|
|
|
|
/*
|
|
* Call prli provider if we should act as a target
|
|
*/
|
|
prov = fc_passive_prov[rdata->spp_type];
|
|
if (prov) {
|
|
memset(&temp_spp, 0, sizeof(temp_spp));
|
|
prov->prli(rdata, pp->prli.prli_spp_len,
|
|
&pp->spp, &temp_spp);
|
|
}
|
|
/*
|
|
* Check if the image pair could be established
|
|
*/
|
|
if (rdata->spp_type != FC_TYPE_FCP ||
|
|
!(pp->spp.spp_flags & FC_SPP_EST_IMG_PAIR)) {
|
|
/*
|
|
* Nope; we can't use this port as a target.
|
|
*/
|
|
fcp_parm &= ~FCP_SPPF_TARG_FCN;
|
|
}
|
|
rdata->supported_classes = FC_COS_CLASS3;
|
|
if (fcp_parm & FCP_SPPF_INIT_FCN)
|
|
roles |= FC_RPORT_ROLE_FCP_INITIATOR;
|
|
if (fcp_parm & FCP_SPPF_TARG_FCN)
|
|
roles |= FC_RPORT_ROLE_FCP_TARGET;
|
|
|
|
rdata->ids.roles = roles;
|
|
fc_rport_enter_rtv(rdata);
|
|
|
|
} else {
|
|
rjt = fc_frame_payload_get(fp, sizeof(*rjt));
|
|
FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n",
|
|
rjt->er_reason, rjt->er_explan);
|
|
fc_rport_error_retry(rdata, FC_EX_ELS_RJT);
|
|
}
|
|
|
|
out:
|
|
fc_frame_free(fp);
|
|
err:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
put:
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_enter_prli() - Send Process Login (PRLI) request
|
|
* @rdata: The remote port to send the PRLI request to
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: increments kref when sending ELS
|
|
*/
|
|
static void fc_rport_enter_prli(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct {
|
|
struct fc_els_prli prli;
|
|
struct fc_els_spp spp;
|
|
} *pp;
|
|
struct fc_frame *fp;
|
|
struct fc4_prov *prov;
|
|
|
|
/*
|
|
* If the rport is one of the well known addresses
|
|
* we skip PRLI and RTV and go straight to READY.
|
|
*/
|
|
if (rdata->ids.port_id >= FC_FID_DOM_MGR) {
|
|
fc_rport_enter_ready(rdata);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* And if the local port does not support the initiator function
|
|
* there's no need to send a PRLI, either.
|
|
*/
|
|
if (!(lport->service_params & FCP_SPPF_INIT_FCN)) {
|
|
fc_rport_enter_ready(rdata);
|
|
return;
|
|
}
|
|
|
|
FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fc_rport_state_enter(rdata, RPORT_ST_PRLI);
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(*pp));
|
|
if (!fp) {
|
|
fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
|
|
return;
|
|
}
|
|
|
|
fc_prli_fill(lport, fp);
|
|
|
|
prov = fc_passive_prov[FC_TYPE_FCP];
|
|
if (prov) {
|
|
pp = fc_frame_payload_get(fp, sizeof(*pp));
|
|
prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp);
|
|
}
|
|
|
|
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id,
|
|
fc_host_port_id(lport->host), FC_TYPE_ELS,
|
|
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
|
|
|
|
kref_get(&rdata->kref);
|
|
if (!fc_exch_seq_send(lport, fp, fc_rport_prli_resp,
|
|
NULL, rdata, 2 * lport->r_a_tov)) {
|
|
fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_rport_rtv_resp() - Handler for Request Timeout Value (RTV) responses
|
|
* @sp: The sequence the RTV was on
|
|
* @fp: The RTV response frame
|
|
* @rdata_arg: The remote port that sent the RTV response
|
|
*
|
|
* Many targets don't seem to support this.
|
|
*
|
|
* Locking Note: This function will be called without the rport lock
|
|
* held, but it will lock, call an _enter_* function or fc_rport_error
|
|
* and then unlock the rport.
|
|
*/
|
|
static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
|
|
void *rdata_arg)
|
|
{
|
|
struct fc_rport_priv *rdata = rdata_arg;
|
|
u8 op;
|
|
|
|
FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
|
|
|
|
if (fp == ERR_PTR(-FC_EX_CLOSED))
|
|
goto put;
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
if (rdata->rp_state != RPORT_ST_RTV) {
|
|
FC_RPORT_DBG(rdata, "Received a RTV response, but in state "
|
|
"%s\n", fc_rport_state(rdata));
|
|
if (IS_ERR(fp))
|
|
goto err;
|
|
goto out;
|
|
}
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_rport_error(rdata, PTR_ERR(fp));
|
|
goto err;
|
|
}
|
|
|
|
op = fc_frame_payload_op(fp);
|
|
if (op == ELS_LS_ACC) {
|
|
struct fc_els_rtv_acc *rtv;
|
|
u32 toq;
|
|
u32 tov;
|
|
|
|
rtv = fc_frame_payload_get(fp, sizeof(*rtv));
|
|
if (rtv) {
|
|
toq = ntohl(rtv->rtv_toq);
|
|
tov = ntohl(rtv->rtv_r_a_tov);
|
|
if (tov == 0)
|
|
tov = 1;
|
|
if (tov > rdata->r_a_tov)
|
|
rdata->r_a_tov = tov;
|
|
tov = ntohl(rtv->rtv_e_d_tov);
|
|
if (toq & FC_ELS_RTV_EDRES)
|
|
tov /= 1000000;
|
|
if (tov == 0)
|
|
tov = 1;
|
|
if (tov > rdata->e_d_tov)
|
|
rdata->e_d_tov = tov;
|
|
}
|
|
}
|
|
|
|
fc_rport_enter_ready(rdata);
|
|
|
|
out:
|
|
fc_frame_free(fp);
|
|
err:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
put:
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request
|
|
* @rdata: The remote port to send the RTV request to
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: increments kref when sending ELS
|
|
*/
|
|
static void fc_rport_enter_rtv(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_frame *fp;
|
|
struct fc_lport *lport = rdata->local_port;
|
|
|
|
FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fc_rport_state_enter(rdata, RPORT_ST_RTV);
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
|
|
if (!fp) {
|
|
fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
|
|
return;
|
|
}
|
|
|
|
kref_get(&rdata->kref);
|
|
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV,
|
|
fc_rport_rtv_resp, rdata,
|
|
2 * lport->r_a_tov)) {
|
|
fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests
|
|
* @rdata: The remote port that sent the RTV request
|
|
* @in_fp: The RTV request frame
|
|
*
|
|
* Locking Note: Called with the lport and rport locks held.
|
|
*/
|
|
static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata,
|
|
struct fc_frame *in_fp)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
struct fc_els_rtv_acc *rtv;
|
|
struct fc_seq_els_data rjt_data;
|
|
|
|
FC_RPORT_DBG(rdata, "Received RTV request\n");
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(*rtv));
|
|
if (!fp) {
|
|
rjt_data.reason = ELS_RJT_UNAB;
|
|
rjt_data.explan = ELS_EXPL_INSUF_RES;
|
|
fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
|
|
goto drop;
|
|
}
|
|
rtv = fc_frame_payload_get(fp, sizeof(*rtv));
|
|
rtv->rtv_cmd = ELS_LS_ACC;
|
|
rtv->rtv_r_a_tov = htonl(lport->r_a_tov);
|
|
rtv->rtv_e_d_tov = htonl(lport->e_d_tov);
|
|
rtv->rtv_toq = 0;
|
|
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
drop:
|
|
fc_frame_free(in_fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_logo_resp() - Handler for logout (LOGO) responses
|
|
* @sp: The sequence the LOGO was on
|
|
* @fp: The LOGO response frame
|
|
* @lport_arg: The local port
|
|
*/
|
|
static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
|
|
void *rdata_arg)
|
|
{
|
|
struct fc_rport_priv *rdata = rdata_arg;
|
|
struct fc_lport *lport = rdata->local_port;
|
|
|
|
FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
|
|
"Received a LOGO %s\n", fc_els_resp_type(fp));
|
|
if (!IS_ERR(fp))
|
|
fc_frame_free(fp);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_enter_logo() - Send a logout (LOGO) request
|
|
* @rdata: The remote port to send the LOGO request to
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: increments kref when sending ELS
|
|
*/
|
|
static void fc_rport_enter_logo(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
|
|
FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
|
|
if (!fp)
|
|
return;
|
|
kref_get(&rdata->kref);
|
|
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
|
|
fc_rport_logo_resp, rdata, 0))
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses
|
|
* @sp: The sequence the ADISC response was on
|
|
* @fp: The ADISC response frame
|
|
* @rdata_arg: The remote port that sent the ADISC response
|
|
*
|
|
* Locking Note: This function will be called without the rport lock
|
|
* held, but it will lock, call an _enter_* function or fc_rport_error
|
|
* and then unlock the rport.
|
|
*/
|
|
static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp,
|
|
void *rdata_arg)
|
|
{
|
|
struct fc_rport_priv *rdata = rdata_arg;
|
|
struct fc_els_adisc *adisc;
|
|
u8 op;
|
|
|
|
FC_RPORT_DBG(rdata, "Received a ADISC response\n");
|
|
|
|
if (fp == ERR_PTR(-FC_EX_CLOSED))
|
|
goto put;
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
if (rdata->rp_state != RPORT_ST_ADISC) {
|
|
FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n",
|
|
fc_rport_state(rdata));
|
|
if (IS_ERR(fp))
|
|
goto err;
|
|
goto out;
|
|
}
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_rport_error(rdata, PTR_ERR(fp));
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* If address verification failed. Consider us logged out of the rport.
|
|
* Since the rport is still in discovery, we want to be
|
|
* logged in, so go to PLOGI state. Otherwise, go back to READY.
|
|
*/
|
|
op = fc_frame_payload_op(fp);
|
|
adisc = fc_frame_payload_get(fp, sizeof(*adisc));
|
|
if (op != ELS_LS_ACC || !adisc ||
|
|
ntoh24(adisc->adisc_port_id) != rdata->ids.port_id ||
|
|
get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name ||
|
|
get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) {
|
|
FC_RPORT_DBG(rdata, "ADISC error or mismatch\n");
|
|
fc_rport_enter_flogi(rdata);
|
|
} else {
|
|
FC_RPORT_DBG(rdata, "ADISC OK\n");
|
|
fc_rport_enter_ready(rdata);
|
|
}
|
|
out:
|
|
fc_frame_free(fp);
|
|
err:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
put:
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_enter_adisc() - Send Address Discover (ADISC) request
|
|
* @rdata: The remote port to send the ADISC request to
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this routine.
|
|
*
|
|
* Reference counting: increments kref when sending ELS
|
|
*/
|
|
static void fc_rport_enter_adisc(struct fc_rport_priv *rdata)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
|
|
FC_RPORT_DBG(rdata, "sending ADISC from %s state\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fc_rport_state_enter(rdata, RPORT_ST_ADISC);
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc));
|
|
if (!fp) {
|
|
fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR);
|
|
return;
|
|
}
|
|
kref_get(&rdata->kref);
|
|
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC,
|
|
fc_rport_adisc_resp, rdata,
|
|
2 * lport->r_a_tov)) {
|
|
fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests
|
|
* @rdata: The remote port that sent the ADISC request
|
|
* @in_fp: The ADISC request frame
|
|
*
|
|
* Locking Note: Called with the lport and rport locks held.
|
|
*/
|
|
static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
|
|
struct fc_frame *in_fp)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
struct fc_els_adisc *adisc;
|
|
struct fc_seq_els_data rjt_data;
|
|
|
|
FC_RPORT_DBG(rdata, "Received ADISC request\n");
|
|
|
|
adisc = fc_frame_payload_get(in_fp, sizeof(*adisc));
|
|
if (!adisc) {
|
|
rjt_data.reason = ELS_RJT_PROT;
|
|
rjt_data.explan = ELS_EXPL_INV_LEN;
|
|
fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
|
|
goto drop;
|
|
}
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(*adisc));
|
|
if (!fp)
|
|
goto drop;
|
|
fc_adisc_fill(lport, fp);
|
|
adisc = fc_frame_payload_get(fp, sizeof(*adisc));
|
|
adisc->adisc_cmd = ELS_LS_ACC;
|
|
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
drop:
|
|
fc_frame_free(in_fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_rls_req() - Handle received Read Link Status request
|
|
* @rdata: The remote port that sent the RLS request
|
|
* @rx_fp: The PRLI request frame
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this function.
|
|
*/
|
|
static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
|
|
struct fc_frame *rx_fp)
|
|
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
struct fc_els_rls *rls;
|
|
struct fc_els_rls_resp *rsp;
|
|
struct fc_els_lesb *lesb;
|
|
struct fc_seq_els_data rjt_data;
|
|
struct fc_host_statistics *hst;
|
|
|
|
FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
|
|
fc_rport_state(rdata));
|
|
|
|
rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
|
|
if (!rls) {
|
|
rjt_data.reason = ELS_RJT_PROT;
|
|
rjt_data.explan = ELS_EXPL_INV_LEN;
|
|
goto out_rjt;
|
|
}
|
|
|
|
fp = fc_frame_alloc(lport, sizeof(*rsp));
|
|
if (!fp) {
|
|
rjt_data.reason = ELS_RJT_UNAB;
|
|
rjt_data.explan = ELS_EXPL_INSUF_RES;
|
|
goto out_rjt;
|
|
}
|
|
|
|
rsp = fc_frame_payload_get(fp, sizeof(*rsp));
|
|
memset(rsp, 0, sizeof(*rsp));
|
|
rsp->rls_cmd = ELS_LS_ACC;
|
|
lesb = &rsp->rls_lesb;
|
|
if (lport->tt.get_lesb) {
|
|
/* get LESB from LLD if it supports it */
|
|
lport->tt.get_lesb(lport, lesb);
|
|
} else {
|
|
fc_get_host_stats(lport->host);
|
|
hst = &lport->host_stats;
|
|
lesb->lesb_link_fail = htonl(hst->link_failure_count);
|
|
lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
|
|
lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
|
|
lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
|
|
lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
|
|
lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
|
|
}
|
|
|
|
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
goto out;
|
|
|
|
out_rjt:
|
|
fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
|
|
out:
|
|
fc_frame_free(rx_fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_els_req() - Handler for validated ELS requests
|
|
* @lport: The local port that received the ELS request
|
|
* @fp: The ELS request frame
|
|
*
|
|
* Handle incoming ELS requests that require port login.
|
|
* The ELS opcode has already been validated by the caller.
|
|
*
|
|
* Locking Note: Called with the lport lock held.
|
|
*
|
|
* Reference counting: does not modify kref
|
|
*/
|
|
static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp)
|
|
{
|
|
struct fc_rport_priv *rdata;
|
|
struct fc_seq_els_data els_data;
|
|
|
|
rdata = fc_rport_lookup(lport, fc_frame_sid(fp));
|
|
if (!rdata) {
|
|
FC_RPORT_ID_DBG(lport, fc_frame_sid(fp),
|
|
"Received ELS 0x%02x from non-logged-in port\n",
|
|
fc_frame_payload_op(fp));
|
|
goto reject;
|
|
}
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
|
|
switch (rdata->rp_state) {
|
|
case RPORT_ST_PRLI:
|
|
case RPORT_ST_RTV:
|
|
case RPORT_ST_READY:
|
|
case RPORT_ST_ADISC:
|
|
break;
|
|
case RPORT_ST_PLOGI:
|
|
if (fc_frame_payload_op(fp) == ELS_PRLI) {
|
|
FC_RPORT_DBG(rdata, "Reject ELS PRLI "
|
|
"while in state %s\n",
|
|
fc_rport_state(rdata));
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
goto busy;
|
|
}
|
|
default:
|
|
FC_RPORT_DBG(rdata,
|
|
"Reject ELS 0x%02x while in state %s\n",
|
|
fc_frame_payload_op(fp), fc_rport_state(rdata));
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
goto reject;
|
|
}
|
|
|
|
switch (fc_frame_payload_op(fp)) {
|
|
case ELS_PRLI:
|
|
fc_rport_recv_prli_req(rdata, fp);
|
|
break;
|
|
case ELS_PRLO:
|
|
fc_rport_recv_prlo_req(rdata, fp);
|
|
break;
|
|
case ELS_ADISC:
|
|
fc_rport_recv_adisc_req(rdata, fp);
|
|
break;
|
|
case ELS_RRQ:
|
|
fc_seq_els_rsp_send(fp, ELS_RRQ, NULL);
|
|
fc_frame_free(fp);
|
|
break;
|
|
case ELS_REC:
|
|
fc_seq_els_rsp_send(fp, ELS_REC, NULL);
|
|
fc_frame_free(fp);
|
|
break;
|
|
case ELS_RLS:
|
|
fc_rport_recv_rls_req(rdata, fp);
|
|
break;
|
|
case ELS_RTV:
|
|
fc_rport_recv_rtv_req(rdata, fp);
|
|
break;
|
|
default:
|
|
fc_frame_free(fp); /* can't happen */
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
return;
|
|
|
|
reject:
|
|
els_data.reason = ELS_RJT_UNAB;
|
|
els_data.explan = ELS_EXPL_PLOGI_REQD;
|
|
fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
|
|
fc_frame_free(fp);
|
|
return;
|
|
|
|
busy:
|
|
els_data.reason = ELS_RJT_BUSY;
|
|
els_data.explan = ELS_EXPL_NONE;
|
|
fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
|
|
fc_frame_free(fp);
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_req() - Handler for requests
|
|
* @lport: The local port that received the request
|
|
* @fp: The request frame
|
|
*
|
|
* Locking Note: Called with the lport lock held.
|
|
*
|
|
* Reference counting: does not modify kref
|
|
*/
|
|
void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp)
|
|
{
|
|
struct fc_seq_els_data els_data;
|
|
|
|
/*
|
|
* Handle FLOGI, PLOGI and LOGO requests separately, since they
|
|
* don't require prior login.
|
|
* Check for unsupported opcodes first and reject them.
|
|
* For some ops, it would be incorrect to reject with "PLOGI required".
|
|
*/
|
|
switch (fc_frame_payload_op(fp)) {
|
|
case ELS_FLOGI:
|
|
fc_rport_recv_flogi_req(lport, fp);
|
|
break;
|
|
case ELS_PLOGI:
|
|
fc_rport_recv_plogi_req(lport, fp);
|
|
break;
|
|
case ELS_LOGO:
|
|
fc_rport_recv_logo_req(lport, fp);
|
|
break;
|
|
case ELS_PRLI:
|
|
case ELS_PRLO:
|
|
case ELS_ADISC:
|
|
case ELS_RRQ:
|
|
case ELS_REC:
|
|
case ELS_RLS:
|
|
case ELS_RTV:
|
|
fc_rport_recv_els_req(lport, fp);
|
|
break;
|
|
default:
|
|
els_data.reason = ELS_RJT_UNSUP;
|
|
els_data.explan = ELS_EXPL_NONE;
|
|
fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
|
|
fc_frame_free(fp);
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(fc_rport_recv_req);
|
|
|
|
/**
|
|
* fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests
|
|
* @lport: The local port that received the PLOGI request
|
|
* @rx_fp: The PLOGI request frame
|
|
*
|
|
* Locking Note: The rport lock is held before calling this function.
|
|
*
|
|
* Reference counting: increments kref on return
|
|
*/
|
|
static void fc_rport_recv_plogi_req(struct fc_lport *lport,
|
|
struct fc_frame *rx_fp)
|
|
{
|
|
struct fc_disc *disc;
|
|
struct fc_rport_priv *rdata;
|
|
struct fc_frame *fp = rx_fp;
|
|
struct fc_els_flogi *pl;
|
|
struct fc_seq_els_data rjt_data;
|
|
u32 sid;
|
|
|
|
sid = fc_frame_sid(fp);
|
|
|
|
FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n");
|
|
|
|
pl = fc_frame_payload_get(fp, sizeof(*pl));
|
|
if (!pl) {
|
|
FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n");
|
|
rjt_data.reason = ELS_RJT_PROT;
|
|
rjt_data.explan = ELS_EXPL_INV_LEN;
|
|
goto reject;
|
|
}
|
|
|
|
disc = &lport->disc;
|
|
mutex_lock(&disc->disc_mutex);
|
|
rdata = fc_rport_create(lport, sid);
|
|
if (!rdata) {
|
|
mutex_unlock(&disc->disc_mutex);
|
|
rjt_data.reason = ELS_RJT_UNAB;
|
|
rjt_data.explan = ELS_EXPL_INSUF_RES;
|
|
goto reject;
|
|
}
|
|
|
|
mutex_lock(&rdata->rp_mutex);
|
|
mutex_unlock(&disc->disc_mutex);
|
|
|
|
rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn);
|
|
rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn);
|
|
|
|
/*
|
|
* If the rport was just created, possibly due to the incoming PLOGI,
|
|
* set the state appropriately and accept the PLOGI.
|
|
*
|
|
* If we had also sent a PLOGI, and if the received PLOGI is from a
|
|
* higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
|
|
* "command already in progress".
|
|
*
|
|
* XXX TBD: If the session was ready before, the PLOGI should result in
|
|
* all outstanding exchanges being reset.
|
|
*/
|
|
switch (rdata->rp_state) {
|
|
case RPORT_ST_INIT:
|
|
FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n");
|
|
break;
|
|
case RPORT_ST_PLOGI_WAIT:
|
|
FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n");
|
|
break;
|
|
case RPORT_ST_PLOGI:
|
|
FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n");
|
|
if (rdata->ids.port_name < lport->wwpn) {
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
rjt_data.reason = ELS_RJT_INPROG;
|
|
rjt_data.explan = ELS_EXPL_NONE;
|
|
goto reject;
|
|
}
|
|
break;
|
|
case RPORT_ST_PRLI:
|
|
case RPORT_ST_RTV:
|
|
case RPORT_ST_READY:
|
|
case RPORT_ST_ADISC:
|
|
FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d "
|
|
"- ignored for now\n", rdata->rp_state);
|
|
/* XXX TBD - should reset */
|
|
break;
|
|
case RPORT_ST_FLOGI:
|
|
case RPORT_ST_DELETE:
|
|
FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n",
|
|
fc_rport_state(rdata));
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
rjt_data.reason = ELS_RJT_BUSY;
|
|
rjt_data.explan = ELS_EXPL_NONE;
|
|
goto reject;
|
|
}
|
|
if (!fc_rport_compatible_roles(lport, rdata)) {
|
|
FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n");
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
rjt_data.reason = ELS_RJT_LOGIC;
|
|
rjt_data.explan = ELS_EXPL_NONE;
|
|
goto reject;
|
|
}
|
|
|
|
/*
|
|
* Get session payload size from incoming PLOGI.
|
|
*/
|
|
rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
|
|
|
|
/*
|
|
* Send LS_ACC. If this fails, the originator should retry.
|
|
*/
|
|
fp = fc_frame_alloc(lport, sizeof(*pl));
|
|
if (!fp)
|
|
goto out;
|
|
|
|
fc_plogi_fill(lport, fp, ELS_LS_ACC);
|
|
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
fc_rport_enter_prli(rdata);
|
|
out:
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
fc_frame_free(rx_fp);
|
|
return;
|
|
|
|
reject:
|
|
fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
|
|
fc_frame_free(fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_prli_req() - Handler for process login (PRLI) requests
|
|
* @rdata: The remote port that sent the PRLI request
|
|
* @rx_fp: The PRLI request frame
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this function.
|
|
*/
|
|
static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
|
|
struct fc_frame *rx_fp)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
struct {
|
|
struct fc_els_prli prli;
|
|
struct fc_els_spp spp;
|
|
} *pp;
|
|
struct fc_els_spp *rspp; /* request service param page */
|
|
struct fc_els_spp *spp; /* response spp */
|
|
unsigned int len;
|
|
unsigned int plen;
|
|
enum fc_els_spp_resp resp;
|
|
struct fc_seq_els_data rjt_data;
|
|
struct fc4_prov *prov;
|
|
|
|
FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
|
|
fc_rport_state(rdata));
|
|
|
|
len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
|
|
pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
|
|
if (!pp)
|
|
goto reject_len;
|
|
plen = ntohs(pp->prli.prli_len);
|
|
if ((plen % 4) != 0 || plen > len || plen < 16)
|
|
goto reject_len;
|
|
if (plen < len)
|
|
len = plen;
|
|
plen = pp->prli.prli_spp_len;
|
|
if ((plen % 4) != 0 || plen < sizeof(*spp) ||
|
|
plen > len || len < sizeof(*pp) || plen < 12)
|
|
goto reject_len;
|
|
rspp = &pp->spp;
|
|
|
|
fp = fc_frame_alloc(lport, len);
|
|
if (!fp) {
|
|
rjt_data.reason = ELS_RJT_UNAB;
|
|
rjt_data.explan = ELS_EXPL_INSUF_RES;
|
|
goto reject;
|
|
}
|
|
pp = fc_frame_payload_get(fp, len);
|
|
WARN_ON(!pp);
|
|
memset(pp, 0, len);
|
|
pp->prli.prli_cmd = ELS_LS_ACC;
|
|
pp->prli.prli_spp_len = plen;
|
|
pp->prli.prli_len = htons(len);
|
|
len -= sizeof(struct fc_els_prli);
|
|
|
|
/*
|
|
* Go through all the service parameter pages and build
|
|
* response. If plen indicates longer SPP than standard,
|
|
* use that. The entire response has been pre-cleared above.
|
|
*/
|
|
spp = &pp->spp;
|
|
mutex_lock(&fc_prov_mutex);
|
|
while (len >= plen) {
|
|
rdata->spp_type = rspp->spp_type;
|
|
spp->spp_type = rspp->spp_type;
|
|
spp->spp_type_ext = rspp->spp_type_ext;
|
|
resp = 0;
|
|
|
|
if (rspp->spp_type < FC_FC4_PROV_SIZE) {
|
|
enum fc_els_spp_resp active = 0, passive = 0;
|
|
|
|
prov = fc_active_prov[rspp->spp_type];
|
|
if (prov)
|
|
active = prov->prli(rdata, plen, rspp, spp);
|
|
prov = fc_passive_prov[rspp->spp_type];
|
|
if (prov)
|
|
passive = prov->prli(rdata, plen, rspp, spp);
|
|
if (!active || passive == FC_SPP_RESP_ACK)
|
|
resp = passive;
|
|
else
|
|
resp = active;
|
|
FC_RPORT_DBG(rdata, "PRLI rspp type %x "
|
|
"active %x passive %x\n",
|
|
rspp->spp_type, active, passive);
|
|
}
|
|
if (!resp) {
|
|
if (spp->spp_flags & FC_SPP_EST_IMG_PAIR)
|
|
resp |= FC_SPP_RESP_CONF;
|
|
else
|
|
resp |= FC_SPP_RESP_INVL;
|
|
}
|
|
spp->spp_flags |= resp;
|
|
len -= plen;
|
|
rspp = (struct fc_els_spp *)((char *)rspp + plen);
|
|
spp = (struct fc_els_spp *)((char *)spp + plen);
|
|
}
|
|
mutex_unlock(&fc_prov_mutex);
|
|
|
|
/*
|
|
* Send LS_ACC. If this fails, the originator should retry.
|
|
*/
|
|
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
|
|
goto drop;
|
|
|
|
reject_len:
|
|
rjt_data.reason = ELS_RJT_PROT;
|
|
rjt_data.explan = ELS_EXPL_INV_LEN;
|
|
reject:
|
|
fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
|
|
drop:
|
|
fc_frame_free(rx_fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
|
|
* @rdata: The remote port that sent the PRLO request
|
|
* @rx_fp: The PRLO request frame
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this function.
|
|
*/
|
|
static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
|
|
struct fc_frame *rx_fp)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
struct fc_frame *fp;
|
|
struct {
|
|
struct fc_els_prlo prlo;
|
|
struct fc_els_spp spp;
|
|
} *pp;
|
|
struct fc_els_spp *rspp; /* request service param page */
|
|
struct fc_els_spp *spp; /* response spp */
|
|
unsigned int len;
|
|
unsigned int plen;
|
|
struct fc_seq_els_data rjt_data;
|
|
|
|
FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
|
|
fc_rport_state(rdata));
|
|
|
|
len = fr_len(rx_fp) - sizeof(struct fc_frame_header);
|
|
pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
|
|
if (!pp)
|
|
goto reject_len;
|
|
plen = ntohs(pp->prlo.prlo_len);
|
|
if (plen != 20)
|
|
goto reject_len;
|
|
if (plen < len)
|
|
len = plen;
|
|
|
|
rspp = &pp->spp;
|
|
|
|
fp = fc_frame_alloc(lport, len);
|
|
if (!fp) {
|
|
rjt_data.reason = ELS_RJT_UNAB;
|
|
rjt_data.explan = ELS_EXPL_INSUF_RES;
|
|
goto reject;
|
|
}
|
|
|
|
pp = fc_frame_payload_get(fp, len);
|
|
WARN_ON(!pp);
|
|
memset(pp, 0, len);
|
|
pp->prlo.prlo_cmd = ELS_LS_ACC;
|
|
pp->prlo.prlo_obs = 0x10;
|
|
pp->prlo.prlo_len = htons(len);
|
|
spp = &pp->spp;
|
|
spp->spp_type = rspp->spp_type;
|
|
spp->spp_type_ext = rspp->spp_type_ext;
|
|
spp->spp_flags = FC_SPP_RESP_ACK;
|
|
|
|
fc_rport_enter_prli(rdata);
|
|
|
|
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
|
|
lport->tt.frame_send(lport, fp);
|
|
goto drop;
|
|
|
|
reject_len:
|
|
rjt_data.reason = ELS_RJT_PROT;
|
|
rjt_data.explan = ELS_EXPL_INV_LEN;
|
|
reject:
|
|
fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data);
|
|
drop:
|
|
fc_frame_free(rx_fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_recv_logo_req() - Handler for logout (LOGO) requests
|
|
* @lport: The local port that received the LOGO request
|
|
* @fp: The LOGO request frame
|
|
*
|
|
* Locking Note: The rport lock is expected to be held before calling
|
|
* this function.
|
|
*
|
|
* Reference counting: drops kref on return
|
|
*/
|
|
static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
|
|
{
|
|
struct fc_rport_priv *rdata;
|
|
u32 sid;
|
|
|
|
fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
|
|
|
|
sid = fc_frame_sid(fp);
|
|
|
|
rdata = fc_rport_lookup(lport, sid);
|
|
if (rdata) {
|
|
mutex_lock(&rdata->rp_mutex);
|
|
FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
|
|
fc_rport_state(rdata));
|
|
|
|
fc_rport_enter_delete(rdata, RPORT_EV_STOP);
|
|
mutex_unlock(&rdata->rp_mutex);
|
|
kref_put(&rdata->kref, fc_rport_destroy);
|
|
} else
|
|
FC_RPORT_ID_DBG(lport, sid,
|
|
"Received LOGO from non-logged-in port\n");
|
|
fc_frame_free(fp);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_flush_queue() - Flush the rport_event_queue
|
|
*/
|
|
void fc_rport_flush_queue(void)
|
|
{
|
|
flush_workqueue(rport_event_queue);
|
|
}
|
|
EXPORT_SYMBOL(fc_rport_flush_queue);
|
|
|
|
/**
|
|
* fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator.
|
|
* @rdata: remote port private
|
|
* @spp_len: service parameter page length
|
|
* @rspp: received service parameter page
|
|
* @spp: response service parameter page
|
|
*
|
|
* Returns the value for the response code to be placed in spp_flags;
|
|
* Returns 0 if not an initiator.
|
|
*/
|
|
static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len,
|
|
const struct fc_els_spp *rspp,
|
|
struct fc_els_spp *spp)
|
|
{
|
|
struct fc_lport *lport = rdata->local_port;
|
|
u32 fcp_parm;
|
|
|
|
fcp_parm = ntohl(rspp->spp_params);
|
|
rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
|
|
if (fcp_parm & FCP_SPPF_INIT_FCN)
|
|
rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
|
|
if (fcp_parm & FCP_SPPF_TARG_FCN)
|
|
rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET;
|
|
if (fcp_parm & FCP_SPPF_RETRY)
|
|
rdata->flags |= FC_RP_FLAGS_RETRY;
|
|
rdata->supported_classes = FC_COS_CLASS3;
|
|
|
|
if (!(lport->service_params & FCP_SPPF_INIT_FCN))
|
|
return 0;
|
|
|
|
spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
|
|
|
|
/*
|
|
* OR in our service parameters with other providers (target), if any.
|
|
*/
|
|
fcp_parm = ntohl(spp->spp_params);
|
|
spp->spp_params = htonl(fcp_parm | lport->service_params);
|
|
return FC_SPP_RESP_ACK;
|
|
}
|
|
|
|
/*
|
|
* FC-4 provider ops for FCP initiator.
|
|
*/
|
|
struct fc4_prov fc_rport_fcp_init = {
|
|
.prli = fc_rport_fcp_prli,
|
|
};
|
|
|
|
/**
|
|
* fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0
|
|
* @rdata: remote port private
|
|
* @spp_len: service parameter page length
|
|
* @rspp: received service parameter page
|
|
* @spp: response service parameter page
|
|
*/
|
|
static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len,
|
|
const struct fc_els_spp *rspp,
|
|
struct fc_els_spp *spp)
|
|
{
|
|
if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR)
|
|
return FC_SPP_RESP_INVL;
|
|
return FC_SPP_RESP_ACK;
|
|
}
|
|
|
|
/*
|
|
* FC-4 provider ops for type 0 service parameters.
|
|
*
|
|
* This handles the special case of type 0 which is always successful
|
|
* but doesn't do anything otherwise.
|
|
*/
|
|
struct fc4_prov fc_rport_t0_prov = {
|
|
.prli = fc_rport_t0_prli,
|
|
};
|
|
|
|
/**
|
|
* fc_setup_rport() - Initialize the rport_event_queue
|
|
*/
|
|
int fc_setup_rport(void)
|
|
{
|
|
rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
|
|
if (!rport_event_queue)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fc_destroy_rport() - Destroy the rport_event_queue
|
|
*/
|
|
void fc_destroy_rport(void)
|
|
{
|
|
destroy_workqueue(rport_event_queue);
|
|
}
|
|
|
|
/**
|
|
* fc_rport_terminate_io() - Stop all outstanding I/O on a remote port
|
|
* @rport: The remote port whose I/O should be terminated
|
|
*/
|
|
void fc_rport_terminate_io(struct fc_rport *rport)
|
|
{
|
|
struct fc_rport_libfc_priv *rpriv = rport->dd_data;
|
|
struct fc_lport *lport = rpriv->local_port;
|
|
|
|
lport->tt.exch_mgr_reset(lport, 0, rport->port_id);
|
|
lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
|
|
}
|
|
EXPORT_SYMBOL(fc_rport_terminate_io);
|