Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
 *
 * Maintained at www.Open-FCoE.org
 */
 
/*
 * RPORT GENERAL INFO
 *
 * This file contains all processing regarding fc_rports. It contains the
 * rport state machine and does all rport interaction with the transport class.
 * There should be no other places in libfc that interact directly with the
 * transport class in regards to adding and deleting rports.
 *
 * fc_rport's represent N_Port's within the fabric.
 */
 
/*
 * RPORT LOCKING
 *
 * The rport should never hold the rport mutex and then attempt to acquire
 * either the lport or disc mutexes. The rport's mutex is considered lesser
 * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for
 * more comments on the hierarchy.
 *
 * The locking strategy is similar to the lport's strategy. The lock protects
 * the rport's states and is held and released by the entry points to the rport
 * block. All _enter_* functions correspond to rport states and expect the rport
 * mutex to be locked before calling them. This means that rports only handle
 * one request or response at a time, since they're not critical for the I/O
 * path this potential over-use of the mutex is acceptable.
 */
 
/*
 * RPORT REFERENCE COUNTING
 *
 * A rport reference should be taken when:
 * - an rport is allocated
 * - a workqueue item is scheduled
 * - an ELS request is send
 * The reference should be dropped when:
 * - the workqueue function has finished
 * - the ELS response is handled
 * - an rport is removed
 */
 
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/export.h>
#include <linux/rculist.h>
 
#include <asm/unaligned.h>
 
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
 
#include "fc_libfc.h"
 
static struct workqueue_struct *rport_event_queue;
 
static void fc_rport_enter_flogi(struct fc_rport_priv *);
static void fc_rport_enter_plogi(struct fc_rport_priv *);
static void fc_rport_enter_prli(struct fc_rport_priv *);
static void fc_rport_enter_rtv(struct fc_rport_priv *);
static void fc_rport_enter_ready(struct fc_rport_priv *);
static void fc_rport_enter_logo(struct fc_rport_priv *);
static void fc_rport_enter_adisc(struct fc_rport_priv *);
 
static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *);
static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *);
static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *);
static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *);
static void fc_rport_timeout(struct work_struct *);
static void fc_rport_error(struct fc_rport_priv *, int);
static void fc_rport_error_retry(struct fc_rport_priv *, int);
static void fc_rport_work(struct work_struct *);
 
static const char *fc_rport_state_names[] = {
<------>[RPORT_ST_INIT] = "Init",
<------>[RPORT_ST_FLOGI] = "FLOGI",
<------>[RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT",
<------>[RPORT_ST_PLOGI] = "PLOGI",
<------>[RPORT_ST_PRLI] = "PRLI",
<------>[RPORT_ST_RTV] = "RTV",
<------>[RPORT_ST_READY] = "Ready",
<------>[RPORT_ST_ADISC] = "ADISC",
<------>[RPORT_ST_DELETE] = "Delete",
};
 
/**
 * fc_rport_lookup() - Lookup a remote port by port_id
 * @lport:   The local port to lookup the remote port on
 * @port_id: The remote port ID to look up
 *
 * The reference count of the fc_rport_priv structure is
 * increased by one.
 */
struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
<------><------><------><------>      u32 port_id)
{
<------>struct fc_rport_priv *rdata = NULL, *tmp_rdata;
 
<------>rcu_read_lock();
<------>list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers)
<------><------>if (tmp_rdata->ids.port_id == port_id &&
<------><------>    kref_get_unless_zero(&tmp_rdata->kref)) {
<------><------><------>rdata = tmp_rdata;
<------><------><------>break;
<------><------>}
<------>rcu_read_unlock();
<------>return rdata;
}
EXPORT_SYMBOL(fc_rport_lookup);
 
/**
 * fc_rport_create() - Create a new remote port
 * @lport: The local port this remote port will be associated with
 * @port_id:   The identifiers for the new remote port
 *
 * The remote port will start in the INIT state.
 */
struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
{
<------>struct fc_rport_priv *rdata;
<------>size_t rport_priv_size = sizeof(*rdata);
 
<------>lockdep_assert_held(&lport->disc.disc_mutex);
 
<------>rdata = fc_rport_lookup(lport, port_id);
<------>if (rdata) {
<------><------>kref_put(&rdata->kref, fc_rport_destroy);
<------><------>return rdata;
<------>}
 
<------>if (lport->rport_priv_size > 0)
<------><------>rport_priv_size = lport->rport_priv_size;
<------>rdata = kzalloc(rport_priv_size, GFP_KERNEL);
<------>if (!rdata)
<------><------>return NULL;
 
<------>rdata->ids.node_name = -1;
<------>rdata->ids.port_name = -1;
<------>rdata->ids.port_id = port_id;
<------>rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
 
<------>kref_init(&rdata->kref);
<------>mutex_init(&rdata->rp_mutex);
<------>rdata->local_port = lport;
<------>rdata->rp_state = RPORT_ST_INIT;
<------>rdata->event = RPORT_EV_NONE;
<------>rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
<------>rdata->e_d_tov = lport->e_d_tov;
<------>rdata->r_a_tov = lport->r_a_tov;
<------>rdata->maxframe_size = FC_MIN_MAX_PAYLOAD;
<------>INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
<------>INIT_WORK(&rdata->event_work, fc_rport_work);
<------>if (port_id != FC_FID_DIR_SERV) {
<------><------>rdata->lld_event_callback = lport->tt.rport_event_callback;
<------><------>list_add_rcu(&rdata->peers, &lport->disc.rports);
<------>}
<------>return rdata;
}
EXPORT_SYMBOL(fc_rport_create);
 
/**
 * fc_rport_destroy() - Free a remote port after last reference is released
 * @kref: The remote port's kref
 */
void fc_rport_destroy(struct kref *kref)
{
<------>struct fc_rport_priv *rdata;
 
<------>rdata = container_of(kref, struct fc_rport_priv, kref);
<------>kfree_rcu(rdata, rcu);
}
EXPORT_SYMBOL(fc_rport_destroy);
 
/**
 * fc_rport_state() - Return a string identifying the remote port's state
 * @rdata: The remote port
 */
static const char *fc_rport_state(struct fc_rport_priv *rdata)
{
<------>const char *cp;
 
<------>cp = fc_rport_state_names[rdata->rp_state];
<------>if (!cp)
<------><------>cp = "Unknown";
<------>return cp;
}
 
/**
 * fc_set_rport_loss_tmo() - Set the remote port loss timeout
 * @rport:   The remote port that gets a new timeout value
 * @timeout: The new timeout value (in seconds)
 */
void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
{
<------>if (timeout)
<------><------>rport->dev_loss_tmo = timeout;
<------>else
<------><------>rport->dev_loss_tmo = 1;
}
EXPORT_SYMBOL(fc_set_rport_loss_tmo);
 
/**
 * fc_plogi_get_maxframe() - Get the maximum payload from the common service
 *			     parameters in a FLOGI frame
 * @flp:    The FLOGI or PLOGI payload
 * @maxval: The maximum frame size upper limit; this may be less than what
 *	    is in the service parameters
 */
static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp,
<------><------><------><------><------>  unsigned int maxval)
{
<------>unsigned int mfs;
 
<------>/*
<------> * Get max payload from the common service parameters and the
<------> * class 3 receive data field size.
<------> */
<------>mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
<------>if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
<------><------>maxval = mfs;
<------>mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
<------>if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
<------><------>maxval = mfs;
<------>return maxval;
}
 
/**
 * fc_rport_state_enter() - Change the state of a remote port
 * @rdata: The remote port whose state should change
 * @new:   The new state
 */
static void fc_rport_state_enter(struct fc_rport_priv *rdata,
<------><------><------><------> enum fc_rport_state new)
{
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>if (rdata->rp_state != new)
<------><------>rdata->retries = 0;
<------>rdata->rp_state = new;
}
 
/**
 * fc_rport_work() - Handler for remote port events in the rport_event_queue
 * @work: Handle to the remote port being dequeued
 *
 * Reference counting: drops kref on return
 */
static void fc_rport_work(struct work_struct *work)
{
<------>u32 port_id;
<------>struct fc_rport_priv *rdata =
<------><------>container_of(work, struct fc_rport_priv, event_work);
<------>struct fc_rport_libfc_priv *rpriv;
<------>enum fc_rport_event event;
<------>struct fc_lport *lport = rdata->local_port;
<------>struct fc_rport_operations *rport_ops;
<------>struct fc_rport_identifiers ids;
<------>struct fc_rport *rport;
<------>struct fc4_prov *prov;
<------>u8 type;
 
<------>mutex_lock(&rdata->rp_mutex);
<------>event = rdata->event;
<------>rport_ops = rdata->ops;
<------>rport = rdata->rport;
 
<------>FC_RPORT_DBG(rdata, "work event %u\n", event);
 
<------>switch (event) {
<------>case RPORT_EV_READY:
<------><------>ids = rdata->ids;
<------><------>rdata->event = RPORT_EV_NONE;
<------><------>rdata->major_retries = 0;
<------><------>kref_get(&rdata->kref);
<------><------>mutex_unlock(&rdata->rp_mutex);
 
<------><------>if (!rport) {
<------><------><------>FC_RPORT_DBG(rdata, "No rport!\n");
<------><------><------>rport = fc_remote_port_add(lport->host, 0, &ids);
<------><------>}
<------><------>if (!rport) {
<------><------><------>FC_RPORT_DBG(rdata, "Failed to add the rport\n");
<------><------><------>fc_rport_logoff(rdata);
<------><------><------>kref_put(&rdata->kref, fc_rport_destroy);
<------><------><------>return;
<------><------>}
<------><------>mutex_lock(&rdata->rp_mutex);
<------><------>if (rdata->rport)
<------><------><------>FC_RPORT_DBG(rdata, "rport already allocated\n");
<------><------>rdata->rport = rport;
<------><------>rport->maxframe_size = rdata->maxframe_size;
<------><------>rport->supported_classes = rdata->supported_classes;
 
<------><------>rpriv = rport->dd_data;
<------><------>rpriv->local_port = lport;
<------><------>rpriv->rp_state = rdata->rp_state;
<------><------>rpriv->flags = rdata->flags;
<------><------>rpriv->e_d_tov = rdata->e_d_tov;
<------><------>rpriv->r_a_tov = rdata->r_a_tov;
<------><------>mutex_unlock(&rdata->rp_mutex);
 
<------><------>if (rport_ops && rport_ops->event_callback) {
<------><------><------>FC_RPORT_DBG(rdata, "callback ev %d\n", event);
<------><------><------>rport_ops->event_callback(lport, rdata, event);
<------><------>}
<------><------>if (rdata->lld_event_callback) {
<------><------><------>FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
<------><------><------>rdata->lld_event_callback(lport, rdata, event);
<------><------>}
<------><------>kref_put(&rdata->kref, fc_rport_destroy);
<------><------>break;
 
<------>case RPORT_EV_FAILED:
<------>case RPORT_EV_LOGO:
<------>case RPORT_EV_STOP:
<------><------>if (rdata->prli_count) {
<------><------><------>mutex_lock(&fc_prov_mutex);
<------><------><------>for (type = 1; type < FC_FC4_PROV_SIZE; type++) {
<------><------><------><------>prov = fc_passive_prov[type];
<------><------><------><------>if (prov && prov->prlo)
<------><------><------><------><------>prov->prlo(rdata);
<------><------><------>}
<------><------><------>mutex_unlock(&fc_prov_mutex);
<------><------>}
<------><------>port_id = rdata->ids.port_id;
<------><------>mutex_unlock(&rdata->rp_mutex);
 
<------><------>if (rport_ops && rport_ops->event_callback) {
<------><------><------>FC_RPORT_DBG(rdata, "callback ev %d\n", event);
<------><------><------>rport_ops->event_callback(lport, rdata, event);
<------><------>}
<------><------>if (rdata->lld_event_callback) {
<------><------><------>FC_RPORT_DBG(rdata, "lld callback ev %d\n", event);
<------><------><------>rdata->lld_event_callback(lport, rdata, event);
<------><------>}
<------><------>if (cancel_delayed_work_sync(&rdata->retry_work))
<------><------><------>kref_put(&rdata->kref, fc_rport_destroy);
 
<------><------>/*
<------><------> * Reset any outstanding exchanges before freeing rport.
<------><------> */
<------><------>lport->tt.exch_mgr_reset(lport, 0, port_id);
<------><------>lport->tt.exch_mgr_reset(lport, port_id, 0);
 
<------><------>if (rport) {
<------><------><------>rpriv = rport->dd_data;
<------><------><------>rpriv->rp_state = RPORT_ST_DELETE;
<------><------><------>mutex_lock(&rdata->rp_mutex);
<------><------><------>rdata->rport = NULL;
<------><------><------>mutex_unlock(&rdata->rp_mutex);
<------><------><------>fc_remote_port_delete(rport);
<------><------>}
 
<------><------>mutex_lock(&rdata->rp_mutex);
<------><------>if (rdata->rp_state == RPORT_ST_DELETE) {
<------><------><------>if (port_id == FC_FID_DIR_SERV) {
<------><------><------><------>rdata->event = RPORT_EV_NONE;
<------><------><------><------>mutex_unlock(&rdata->rp_mutex);
<------><------><------><------>kref_put(&rdata->kref, fc_rport_destroy);
<------><------><------>} else if ((rdata->flags & FC_RP_STARTED) &&
<------><------><------><------>   rdata->major_retries <
<------><------><------><------>   lport->max_rport_retry_count) {
<------><------><------><------>rdata->major_retries++;
<------><------><------><------>rdata->event = RPORT_EV_NONE;
<------><------><------><------>FC_RPORT_DBG(rdata, "work restart\n");
<------><------><------><------>fc_rport_enter_flogi(rdata);
<------><------><------><------>mutex_unlock(&rdata->rp_mutex);
<------><------><------>} else {
<------><------><------><------>mutex_unlock(&rdata->rp_mutex);
<------><------><------><------>FC_RPORT_DBG(rdata, "work delete\n");
<------><------><------><------>mutex_lock(&lport->disc.disc_mutex);
<------><------><------><------>list_del_rcu(&rdata->peers);
<------><------><------><------>mutex_unlock(&lport->disc.disc_mutex);
<------><------><------><------>kref_put(&rdata->kref, fc_rport_destroy);
<------><------><------>}
<------><------>} else {
<------><------><------>/*
<------><------><------> * Re-open for events.  Reissue READY event if ready.
<------><------><------> */
<------><------><------>rdata->event = RPORT_EV_NONE;
<------><------><------>if (rdata->rp_state == RPORT_ST_READY) {
<------><------><------><------>FC_RPORT_DBG(rdata, "work reopen\n");
<------><------><------><------>fc_rport_enter_ready(rdata);
<------><------><------>}
<------><------><------>mutex_unlock(&rdata->rp_mutex);
<------><------>}
<------><------>break;
 
<------>default:
<------><------>mutex_unlock(&rdata->rp_mutex);
<------><------>break;
<------>}
<------>kref_put(&rdata->kref, fc_rport_destroy);
}
 
/**
 * fc_rport_login() - Start the remote port login state machine
 * @rdata: The remote port to be logged in to
 *
 * Initiates the RP state machine. It is called from the LP module.
 * This function will issue the following commands to the N_Port
 * identified by the FC ID provided.
 *
 * - PLOGI
 * - PRLI
 * - RTV
 *
 * Locking Note: Called without the rport lock held. This
 * function will hold the rport lock, call an _enter_*
 * function and then unlock the rport.
 *
 * This indicates the intent to be logged into the remote port.
 * If it appears we are already logged in, ADISC is used to verify
 * the setup.
 */
int fc_rport_login(struct fc_rport_priv *rdata)
{
<------>mutex_lock(&rdata->rp_mutex);
 
<------>if (rdata->flags & FC_RP_STARTED) {
<------><------>FC_RPORT_DBG(rdata, "port already started\n");
<------><------>mutex_unlock(&rdata->rp_mutex);
<------><------>return 0;
<------>}
 
<------>rdata->flags |= FC_RP_STARTED;
<------>switch (rdata->rp_state) {
<------>case RPORT_ST_READY:
<------><------>FC_RPORT_DBG(rdata, "ADISC port\n");
<------><------>fc_rport_enter_adisc(rdata);
<------><------>break;
<------>case RPORT_ST_DELETE:
<------><------>FC_RPORT_DBG(rdata, "Restart deleted port\n");
<------><------>break;
<------>case RPORT_ST_INIT:
<------><------>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
 *
 * 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)
{
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>if (rdata->rp_state == RPORT_ST_DELETE)
<------><------>return;
 
<------>FC_RPORT_DBG(rdata, "Delete port\n");
 
<------>fc_rport_state_enter(rdata, RPORT_ST_DELETE);
 
<------>if (rdata->event == RPORT_EV_NONE) {
<------><------>kref_get(&rdata->kref);
<------><------>if (!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
 *
 * Reference counting: schedules workqueue, does not modify kref
 */
static void fc_rport_enter_ready(struct fc_rport_priv *rdata)
{
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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:
<------><------>fc_rport_enter_plogi(rdata);
<------><------>break;
<------>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.
 *
 * 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);
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>/* 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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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_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");
 
<------>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));
<------><------>if (!rjt)
<------><------><------>FC_RPORT_DBG(rdata, "PLOGI bad response\n");
<------><------>else
<------><------><------>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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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) {
<------><------><------>fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
<------><------><------>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)) {
<------><------><------>fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR);
<------><------><------>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
<------><------> */
<------><------>if (rdata->spp_type < FC_FC4_PROV_SIZE) {
<------><------><------>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));
<------><------>if (!rjt)
<------><------><------>FC_RPORT_DBG(rdata, "PRLI bad response\n");
<------><------>else {
<------><------><------>FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n",
<------><------><------><------>     rjt->er_reason, rjt->er_explan);
<------><------><------>if (rjt->er_reason == ELS_RJT_UNAB &&
<------><------><------>    rjt->er_explan == ELS_EXPL_PLOGI_REQD) {
<------><------><------><------>fc_rport_enter_plogi(rdata);
<------><------><------><------>goto out;
<------><------><------>}
<------><------>}
<------><------>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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>/*
<------> * 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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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
 */
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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
<------>lockdep_assert_held(&lport->lp_mutex);
 
<------>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
 * @rdata_arg: The remote 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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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
 *
 * 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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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
 */
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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
<------>lockdep_assert_held(&lport->lp_mutex);
 
<------>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
 */
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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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.
 *
 * 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;
 
<------>lockdep_assert_held(&lport->lp_mutex);
 
<------>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;
<------><------>}
<------><------>fallthrough;
<------>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
 *
 * 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;
 
<------>lockdep_assert_held(&lport->lp_mutex);
 
<------>/*
<------> * 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
 *
 * 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;
 
<------>lockdep_assert_held(&lport->lp_mutex);
 
<------>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
 */
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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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
 */
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;
 
<------>lockdep_assert_held(&rdata->rp_mutex);
 
<------>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
 *
 * 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;
 
<------>lockdep_assert_held(&lport->lp_mutex);
 
<------>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);