q3k/linux
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
linux/drivers/scsi/libfc/fc_rport.c
Parikh, Neerav fe5e3f1aec [SCSI] libfc: Fixing a memory leak when destroying an interface 
When an fcoe interface is being destroyed; in the process the
fcoe driver will try to release all the resources it had allocated
for that interface including rports. But, it seems that it does not
release the reference held for the name server rport in that process
resulting into a memory leak. This patch fixes that memory leak.

Signed-off-by: Neerav Parikh <neerav.parikh@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-02-28 18:28:45 -06:00

2039 lines
54 KiB
C
Raw Blame History

/*
* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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.
*/
#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 <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 *, struct fc_frame *);
static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *);
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 caller must hold either disc_mutex or rcu_read_lock().
*/
static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport,
u32 port_id)
{
struct fc_rport_priv *rdata;
list_for_each_entry_rcu(rdata, &lport->disc.rports, peers)
if (rdata->ids.port_id == port_id)
return rdata;
return NULL;
}
/**
* fc_rport_create() - Create a new remote port
* @lport: The local port this remote port will be associated with
* @ids: The identifiers for the new remote port
*
* The remote port will start in the INIT state.
*
* Locking note: must be called with the disc_mutex held.
*/
static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport,
u32 port_id)
{
struct fc_rport_priv *rdata;
rdata = lport->tt.rport_lookup(lport, port_id);
if (rdata)
return rdata;
rdata = kzalloc(sizeof(*rdata) + lport->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;
}
/**
* fc_rport_free_rcu() - Free a remote port
* @rcu: The rcu_head structure inside the remote port
*/
static void fc_rport_free_rcu(struct rcu_head *rcu)
{
struct fc_rport_priv *rdata;
rdata = container_of(rcu, struct fc_rport_priv, rcu);
kfree(rdata);
}
/**
* fc_rport_destroy() - Free a remote port after last reference is released
* @kref: The remote port's kref
*/
static void fc_rport_destroy(struct kref *kref)
{
struct fc_rport_priv *rdata;
rdata = container_of(kref, struct fc_rport_priv, kref);
call_rcu(&rdata->rcu, fc_rport_free_rcu);
}
/**
* 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
*
* Locking Note: Called with the rport lock held
*/
static void fc_rport_state_enter(struct fc_rport_priv *rdata,
enum fc_rport_state new)
{
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
*/
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)
rport = fc_remote_port_add(lport->host, 0, &ids);
if (!rport) {
FC_RPORT_DBG(rdata, "Failed to add the rport\n");
lport->tt.rport_logoff(rdata);
kref_put(&rdata->kref, lport->tt.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, lport->tt.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);
}
cancel_delayed_work_sync(&rdata->retry_work);
/*
* 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(&lport->disc.disc_mutex);
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, lport->tt.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 {
FC_RPORT_DBG(rdata, "work delete\n");
list_del_rcu(&rdata->peers);
mutex_unlock(&rdata->rp_mutex);
kref_put(&rdata->kref, lport->tt.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_enter_ready(rdata);
mutex_unlock(&rdata->rp_mutex);
}
mutex_unlock(&lport->disc.disc_mutex);
break;
default:
mutex_unlock(&rdata->rp_mutex);
break;
}
}
/**
* fc_rport_login() - Start the remote port login state machine
* @rdata: The remote port to be logged in to
*
* 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);
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;
default:
FC_RPORT_DBG(rdata, "Login to port\n");
fc_rport_enter_flogi(rdata);
break;
}
mutex_unlock(&rdata->rp_mutex);
return 0;
}
/**
* 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.
*/
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);
if (rdata->event == RPORT_EV_NONE)
queue_work(rport_event_queue, &rdata->event_work);
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)
{
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_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;
}
/**
* 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.
*/
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");
if (rdata->event == RPORT_EV_NONE)
queue_work(rport_event_queue, &rdata->event_work);
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.
*/
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);
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);
}
/**
* fc_rport_error() - Error handler, called once retries have been exhausted
* @rdata: The remote port the error is happened on
* @fp: The error code encapsulated in a frame pointer
*
* Locking Note: The rport lock is expected to be held before
* calling this routine
*/
static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp)
{
FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n",
IS_ERR(fp) ? -PTR_ERR(fp) : 0,
fc_rport_state(rdata), rdata->retries);
switch (rdata->rp_state) {
case RPORT_ST_FLOGI:
case RPORT_ST_PLOGI:
rdata->flags &= ~FC_RP_STARTED;
fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
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
* @fp: The error code encapsulated in a frame pointer
*
* 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
*/
static void fc_rport_error_retry(struct fc_rport_priv *rdata,
struct fc_frame *fp)
{
unsigned long delay = FC_DEF_E_D_TOV;
/* make sure this isn't an FC_EX_CLOSED error, never retry those */
if (PTR_ERR(fp) == -FC_EX_CLOSED)
goto out;
if (rdata->retries < rdata->local_port->max_rport_retry_count) {
FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n",
PTR_ERR(fp), fc_rport_state(rdata));
rdata->retries++;
/* no additional delay on exchange timeouts */
if (PTR_ERR(fp) == -FC_EX_TIMEOUT)
delay = 0;
schedule_delayed_work(&rdata->retry_work, delay);
return;
}
out:
fc_rport_error(rdata, fp);
}
/**
* 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
*/
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;
FC_RPORT_DBG(rdata, "Received a FLOGI %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_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, fp);
goto err;
}
if (fc_frame_payload_op(fp) != ELS_LS_ACC)
goto bad;
if (fc_rport_login_complete(rdata, fp))
goto bad;
flogi = fc_frame_payload_get(fp, sizeof(*flogi));
if (!flogi)
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, rdata->local_port->tt.rport_destroy);
return;
bad:
FC_RPORT_DBG(rdata, "Bad FLOGI response\n");
fc_rport_error_retry(rdata, fp);
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.
*/
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, fp);
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, NULL);
else
kref_get(&rdata->kref);
}
/**
* 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
*/
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;
mutex_lock(&disc->disc_mutex);
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 = lport->tt.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:
case RPORT_ST_DELETE:
mutex_unlock(&rdata->rp_mutex);
rjt_data.reason = ELS_RJT_FIP;
rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR;
goto reject;
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;
}
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;
}
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);
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);
mutex_unlock(&disc->disc_mutex);
fc_frame_free(rx_fp);
return;
reject:
mutex_unlock(&disc->disc_mutex);
lport->tt.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;
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp));
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, 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
fc_rport_error_retry(rdata, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
}
/**
* 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.
*/
static void fc_rport_enter_plogi(struct fc_rport_priv *rdata)
{
struct fc_lport *lport = rdata->local_port;
struct fc_frame *fp;
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, fp);
return;
}
rdata->e_d_tov = lport->e_d_tov;
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, NULL);
else
kref_get(&rdata->kref);
}
/**
* 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 fc4_prov *prov;
u32 roles = FC_RPORT_ROLE_UNKNOWN;
u32 fcp_parm = 0;
u8 op;
u8 resp_code = 0;
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp));
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, 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\n",
pp->spp.spp_flags);
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, fp);
else
fc_rport_error_retry(rdata, fp);
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;
prov = fc_passive_prov[FC_TYPE_FCP];
if (prov) {
memset(&temp_spp, 0, sizeof(temp_spp));
prov->prli(rdata, pp->prli.prli_spp_len,
&pp->spp, &temp_spp);
}
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 {
FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n");
fc_rport_error_retry(rdata, fp);
}
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
kref_put(&rdata->kref, rdata->local_port->tt.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.
*/
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;
}
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, fp);
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);
if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp,
NULL, rdata, 2 * lport->r_a_tov))
fc_rport_error_retry(rdata, NULL);
else
kref_get(&rdata->kref);
}
/**
* fc_rport_els_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;
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp));
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, 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;
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;
rdata->e_d_tov = tov;
}
}
fc_rport_enter_ready(rdata);
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
kref_put(&rdata->kref, rdata->local_port->tt.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.
*/
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, fp);
return;
}
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, NULL);
else
kref_get(&rdata->kref);
}
/**
* 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 *lport_arg)
{
struct fc_lport *lport = lport_arg;
FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did,
"Received a LOGO %s\n", fc_els_resp_type(fp));
if (IS_ERR(fp))
return;
fc_frame_free(fp);
}
/**
* 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.
*/
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;
(void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
fc_rport_logo_resp, lport, 0);
}
/**
* 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;
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Received a ADISC response\n");
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, 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);
kref_put(&rdata->kref, rdata->local_port->tt.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.
*/
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, fp);
return;
}
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, NULL);
else
kref_get(&rdata->kref);
}
/**
* 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;
lport->tt.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:
lport->tt.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.
*/
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;
mutex_lock(&lport->disc.disc_mutex);
rdata = lport->tt.rport_lookup(lport, fc_frame_sid(fp));
if (!rdata) {
mutex_unlock(&lport->disc.disc_mutex);
goto reject;
}
mutex_lock(&rdata->rp_mutex);
mutex_unlock(&lport->disc.disc_mutex);
switch (rdata->rp_state) {
case RPORT_ST_PRLI:
case RPORT_ST_RTV:
case RPORT_ST_READY:
case RPORT_ST_ADISC:
break;
default:
mutex_unlock(&rdata->rp_mutex);
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:
lport->tt.seq_els_rsp_send(fp, ELS_RRQ, NULL);
fc_frame_free(fp);
break;
case ELS_REC:
lport->tt.seq_els_rsp_send(fp, ELS_REC, NULL);
fc_frame_free(fp);
break;
case ELS_RLS:
fc_rport_recv_rls_req(rdata, fp);
break;
default:
fc_frame_free(fp); /* can't happen */
break;
}
mutex_unlock(&rdata->rp_mutex);
return;
reject:
els_data.reason = ELS_RJT_UNAB;
els_data.explan = ELS_EXPL_PLOGI_REQD;
lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
fc_frame_free(fp);
}
/**
* 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.
*/
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:
fc_rport_recv_els_req(lport, fp);
break;
default:
els_data.reason = ELS_RJT_UNSUP;
els_data.explan = ELS_EXPL_NONE;
lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data);
fc_frame_free(fp);
break;
}
}
/**
* 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.
*/
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 = lport->tt.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;
}
/*
* 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:
lport->tt.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 exected 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;
enum fc_els_spp_resp passive;
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) {
prov = fc_active_prov[rspp->spp_type];
if (prov)
resp = prov->prli(rdata, plen, rspp, spp);
prov = fc_passive_prov[rspp->spp_type];
if (prov) {
passive = prov->prli(rdata, plen, rspp, spp);
if (!resp || passive == FC_SPP_RESP_ACK)
resp = 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);
switch (rdata->rp_state) {
case RPORT_ST_PRLI:
fc_rport_enter_ready(rdata);
break;
default:
break;
}
goto drop;
reject_len:
rjt_data.reason = ELS_RJT_PROT;
rjt_data.explan = ELS_EXPL_INV_LEN;
reject:
lport->tt.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 exected 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_delete(rdata, RPORT_EV_LOGO);
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:
lport->tt.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 exected to be held before calling
* this function.
*/
static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_rport_priv *rdata;
u32 sid;
lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
sid = fc_frame_sid(fp);
mutex_lock(&lport->disc.disc_mutex);
rdata = lport->tt.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_LOGO);
mutex_unlock(&rdata->rp_mutex);
} else
FC_RPORT_ID_DBG(lport, sid,
"Received LOGO from non-logged-in port\n");
mutex_unlock(&lport->disc.disc_mutex);
fc_frame_free(fp);
}
/**
* fc_rport_flush_queue() - Flush the rport_event_queue
*/
static void fc_rport_flush_queue(void)
{
flush_workqueue(rport_event_queue);
}
/**
* fc_rport_init() - Initialize the remote port layer for a local port
* @lport: The local port to initialize the remote port layer for
*/
int fc_rport_init(struct fc_lport *lport)
{
if (!lport->tt.rport_lookup)
lport->tt.rport_lookup = fc_rport_lookup;
if (!lport->tt.rport_create)
lport->tt.rport_create = fc_rport_create;
if (!lport->tt.rport_login)
lport->tt.rport_login = fc_rport_login;
if (!lport->tt.rport_logoff)
lport->tt.rport_logoff = fc_rport_logoff;
if (!lport->tt.rport_recv_req)
lport->tt.rport_recv_req = fc_rport_recv_req;
if (!lport->tt.rport_flush_queue)
lport->tt.rport_flush_queue = fc_rport_flush_queue;
if (!lport->tt.rport_destroy)
lport->tt.rport_destroy = fc_rport_destroy;
return 0;
}
EXPORT_SYMBOL(fc_rport_init);
/**
* 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 & FC_RPORT_ROLE_FCP_INITIATOR))
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);
Reference in a new issue View git blame Copy permalink