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25b37b981e
linux/drivers/scsi/libfc/fc_rport.c
Joe Eykholt 25b37b981e [SCSI] libfc: fix: rport_recv_req needs disc_mutex when calling rport_lookup 
The rport_lookup function must be called while holding the disc_mutex.
Otherwise, the rdata could be deleted just after that by another thread.

All callers now check the state after grabbing the rdata rp_mutex.
Even though rport_lookup skips ports in DELETE state, it does that
without holding the rdata rp_mutex, so that the state may change.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-10 12:07:59 -05:00

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/*
* 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 heirarchy.
*
* 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/rcupdate.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <asm/unaligned.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
struct workqueue_struct *rport_event_queue;
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_recv_plogi_req(struct fc_rport_priv *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_recv_prli_req(struct fc_rport_priv *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_recv_prlo_req(struct fc_rport_priv *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_recv_logo_req(struct fc_rport_priv *,
struct fc_seq *, 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_PLOGI] = "PLOGI",
[RPORT_ST_PRLI] = "PRLI",
[RPORT_ST_RTV] = "RTV",
[RPORT_ST_READY] = "Ready",
[RPORT_ST_LOGO] = "LOGO",
[RPORT_ST_DELETE] = "Delete",
};
/**
* fc_rport_lookup() - lookup a remote port by port_id
* @lport: Fibre Channel host port instance
* @port_id: remote port port_id to match
*/
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(rdata, &lport->disc.rports, peers)
if (rdata->ids.port_id == port_id &&
rdata->rp_state != RPORT_ST_DELETE)
return rdata;
return NULL;
}
/**
* fc_rport_create() - Create a new remote port
* @lport: The local port that the new remote port is for
* @port_id: The port ID for the new remote port
*
* 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), 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)
list_add(&rdata->peers, &lport->disc.rports);
return rdata;
}
/**
* fc_rport_destroy() - free a remote port after last reference is released.
* @kref: pointer to kref inside struct fc_rport_priv
*/
static void fc_rport_destroy(struct kref *kref)
{
struct fc_rport_priv *rdata;
rdata = container_of(kref, struct fc_rport_priv, kref);
kfree(rdata);
}
/**
* fc_rport_state() - return a string for the state the rport is in
* @rdata: remote port private data
*/
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 in seconds.
* @rport: Pointer to Fibre Channel remote port structure
* @timeout: timeout in seconds
*/
void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
{
if (timeout)
rport->dev_loss_tmo = timeout + 5;
else
rport->dev_loss_tmo = 30;
}
EXPORT_SYMBOL(fc_set_rport_loss_tmo);
/**
* fc_plogi_get_maxframe() - Get max payload from the common service parameters
* @flp: FLOGI payload structure
* @maxval: upper limit, 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 rport's state
* @rdata: The rport whose state should change
* @new: The new state of the rport
*
* 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;
}
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 *rp;
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;
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;
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;
rp = rport->dd_data;
rp->local_port = lport;
rp->rp_state = rdata->rp_state;
rp->flags = rdata->flags;
rp->e_d_tov = rdata->e_d_tov;
rp->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);
}
kref_put(&rdata->kref, lport->tt.rport_destroy);
break;
case RPORT_EV_FAILED:
case RPORT_EV_LOGO:
case RPORT_EV_STOP:
port_id = rdata->ids.port_id;
mutex_unlock(&rdata->rp_mutex);
if (port_id != FC_FID_DIR_SERV) {
mutex_lock(&lport->disc.disc_mutex);
list_del(&rdata->peers);
mutex_unlock(&lport->disc.disc_mutex);
}
if (rport_ops && rport_ops->event_callback) {
FC_RPORT_DBG(rdata, "callback ev %d\n", event);
rport_ops->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) {
rp = rport->dd_data;
rp->rp_state = RPORT_ST_DELETE;
mutex_lock(&rdata->rp_mutex);
rdata->rport = NULL;
mutex_unlock(&rdata->rp_mutex);
fc_remote_port_delete(rport);
}
kref_put(&rdata->kref, lport->tt.rport_destroy);
break;
default:
mutex_unlock(&rdata->rp_mutex);
break;
}
}
/**
* fc_rport_login() - Start the remote port login state machine
* @rdata: private remote port
*
* 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_login(struct fc_rport_priv *rdata)
{
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Login to port\n");
fc_rport_enter_plogi(rdata);
mutex_unlock(&rdata->rp_mutex);
return 0;
}
/**
* fc_rport_enter_delete() - schedule a remote port to be deleted.
* @rdata: private remote port
* @event: 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 an rport
* @rdata: private remote port
*
* 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");
if (rdata->rp_state == RPORT_ST_DELETE) {
FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n");
mutex_unlock(&rdata->rp_mutex);
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);
mutex_unlock(&rdata->rp_mutex);
out:
return 0;
}
/**
* fc_rport_enter_ready() - The rport is ready
* @rdata: private remote port
*
* 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: The work struct of the fc_rport_priv
*
* 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_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_LOGO:
fc_rport_enter_logo(rdata);
break;
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: private remote port
* @fp: The 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_PLOGI:
case RPORT_ST_PRLI:
case RPORT_ST_LOGO:
fc_rport_enter_delete(rdata, RPORT_EV_FAILED);
break;
case RPORT_ST_RTV:
fc_rport_enter_ready(rdata);
break;
case RPORT_ST_DELETE:
case RPORT_ST_READY:
case RPORT_ST_INIT:
break;
}
}
/**
* fc_rport_error_retry() - Error handler when retries are desired
* @rdata: private remote port data
* @fp: The 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)
return fc_rport_error(rdata, fp);
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;
}
return fc_rport_error(rdata, fp);
}
/**
* fc_rport_plogi_recv_resp() - Handle incoming ELS PLOGI response
* @sp: current sequence in the PLOGI exchange
* @fp: response frame
* @rdata_arg: private remote port data
*
* 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;
unsigned int tov;
u16 csp_seq;
u16 cssp_seq;
u8 op;
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Received a PLOGI response\n");
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);
tov = ntohl(plp->fl_csp.sp_e_d_tov);
if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
tov /= 1000;
if (tov > rdata->e_d_tov)
rdata->e_d_tov = tov;
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);
/*
* 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);
else
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 to peer
* @rdata: private remote port data
*
* 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_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, lport->e_d_tov))
fc_rport_error_retry(rdata, fp);
else
kref_get(&rdata->kref);
}
/**
* fc_rport_prli_resp() - Process Login (PRLI) response handler
* @sp: current sequence in the PRLI exchange
* @fp: response frame
* @rdata_arg: private remote port data
*
* 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;
u32 roles = FC_RPORT_ROLE_UNKNOWN;
u32 fcp_parm = 0;
u8 op;
mutex_lock(&rdata->rp_mutex);
FC_RPORT_DBG(rdata, "Received a PRLI response\n");
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 && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
fcp_parm = ntohl(pp->spp.spp_params);
if (fcp_parm & FCP_SPPF_RETRY)
rdata->flags |= FC_RP_FLAGS_RETRY;
}
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_enter_delete(rdata, RPORT_EV_FAILED);
}
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
}
/**
* fc_rport_logo_resp() - Logout (LOGO) response handler
* @sp: current sequence in the LOGO exchange
* @fp: response frame
* @rdata_arg: private remote port data
*
* 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_logo_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 LOGO response\n");
if (rdata->rp_state != RPORT_ST_LOGO) {
FC_RPORT_DBG(rdata, "Received a LOGO 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) {
fc_rport_enter_rtv(rdata);
} else {
FC_RPORT_DBG(rdata, "Bad ELS response for LOGO command\n");
fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
}
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 to peer
* @rdata: private remote port data
*
* 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;
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;
}
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI,
fc_rport_prli_resp, rdata, lport->e_d_tov))
fc_rport_error_retry(rdata, fp);
else
kref_get(&rdata->kref);
}
/**
* fc_rport_els_rtv_resp() - Request Timeout Value response handler
* @sp: current sequence in the RTV exchange
* @fp: response frame
* @rdata_arg: private remote port data
*
* 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 response\n");
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 to peer
* @rdata: private remote port data
*
* 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, lport->e_d_tov))
fc_rport_error_retry(rdata, fp);
else
kref_get(&rdata->kref);
}
/**
* fc_rport_enter_logo() - Send Logout (LOGO) request to peer
* @rdata: private remote port data
*
* 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 entered LOGO state from %s state\n",
fc_rport_state(rdata));
fc_rport_state_enter(rdata, RPORT_ST_LOGO);
fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
if (!fp) {
fc_rport_error_retry(rdata, fp);
return;
}
if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO,
fc_rport_logo_resp, rdata, lport->e_d_tov))
fc_rport_error_retry(rdata, fp);
else
kref_get(&rdata->kref);
}
/**
* fc_rport_recv_req() - Receive a request from a rport
* @sp: current sequence in the PLOGI exchange
* @fp: response frame
* @lport: Fibre Channel local port
*
* Locking Note: Called with the lport lock held.
*/
void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
struct fc_lport *lport)
{
struct fc_rport_priv *rdata;
struct fc_frame_header *fh;
struct fc_seq_els_data els_data;
u32 s_id;
u8 op;
els_data.fp = NULL;
els_data.explan = ELS_EXPL_NONE;
els_data.reason = ELS_RJT_NONE;
fh = fc_frame_header_get(fp);
s_id = ntoh24(fh->fh_s_id);
mutex_lock(&lport->disc.disc_mutex);
rdata = lport->tt.rport_lookup(lport, s_id);
if (!rdata) {
mutex_unlock(&lport->disc.disc_mutex);
els_data.reason = ELS_RJT_UNAB;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
fc_frame_free(fp);
return;
}
mutex_lock(&rdata->rp_mutex);
mutex_unlock(&lport->disc.disc_mutex);
op = fc_frame_payload_op(fp);
switch (op) {
case ELS_PLOGI:
fc_rport_recv_plogi_req(rdata, sp, fp);
break;
case ELS_PRLI:
fc_rport_recv_prli_req(rdata, sp, fp);
break;
case ELS_PRLO:
fc_rport_recv_prlo_req(rdata, sp, fp);
break;
case ELS_LOGO:
fc_rport_recv_logo_req(rdata, sp, fp);
break;
case ELS_RRQ:
els_data.fp = fp;
lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
break;
case ELS_REC:
els_data.fp = fp;
lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
break;
default:
els_data.reason = ELS_RJT_UNSUP;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
break;
}
mutex_unlock(&rdata->rp_mutex);
}
/**
* fc_rport_recv_plogi_req() - Handle incoming Port Login (PLOGI) request
* @rdata: private remote port data
* @sp: current sequence in the PLOGI exchange
* @fp: PLOGI request frame
*
* Locking Note: The rport lock is exected to be held before calling
* this function.
*/
static void fc_rport_recv_plogi_req(struct fc_rport_priv *rdata,
struct fc_seq *sp, struct fc_frame *rx_fp)
{
struct fc_lport *lport = rdata->local_port;
struct fc_frame *fp = rx_fp;
struct fc_exch *ep;
struct fc_frame_header *fh;
struct fc_els_flogi *pl;
struct fc_seq_els_data rjt_data;
u32 sid;
u64 wwpn;
u64 wwnn;
enum fc_els_rjt_reason reject = 0;
u32 f_ctl;
rjt_data.fp = NULL;
fh = fc_frame_header_get(fp);
FC_RPORT_DBG(rdata, "Received PLOGI request while in state %s\n",
fc_rport_state(rdata));
sid = ntoh24(fh->fh_s_id);
pl = fc_frame_payload_get(fp, sizeof(*pl));
if (!pl) {
FC_RPORT_DBG(rdata, "Received PLOGI too short\n");
WARN_ON(1);
/* XXX TBD: send reject? */
fc_frame_free(fp);
return;
}
wwpn = get_unaligned_be64(&pl->fl_wwpn);
wwnn = get_unaligned_be64(&pl->fl_wwnn);
/*
* If the session 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, wwpn %llx state INIT "
"- reject\n", (unsigned long long)wwpn);
reject = ELS_RJT_UNSUP;
break;
case RPORT_ST_PLOGI:
FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state %d\n",
rdata->rp_state);
if (wwpn < lport->wwpn)
reject = ELS_RJT_INPROG;
break;
case RPORT_ST_PRLI:
case RPORT_ST_READY:
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_DELETE:
default:
FC_RPORT_DBG(rdata, "Received PLOGI in unexpected "
"state %d\n", rdata->rp_state);
fc_frame_free(fp);
return;
break;
}
if (reject) {
rjt_data.reason = reject;
rjt_data.explan = ELS_EXPL_NONE;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
} else {
fp = fc_frame_alloc(lport, sizeof(*pl));
if (fp == NULL) {
fp = rx_fp;
rjt_data.reason = ELS_RJT_UNAB;
rjt_data.explan = ELS_EXPL_NONE;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
} else {
sp = lport->tt.seq_start_next(sp);
WARN_ON(!sp);
rdata->ids.port_name = wwpn;
rdata->ids.node_name = wwnn;
/*
* Get session payload size from incoming PLOGI.
*/
rdata->maxframe_size =
fc_plogi_get_maxframe(pl, lport->mfs);
fc_frame_free(rx_fp);
fc_plogi_fill(lport, fp, ELS_LS_ACC);
/*
* Send LS_ACC. If this fails,
* the originator should retry.
*/
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
if (rdata->rp_state == RPORT_ST_PLOGI)
fc_rport_enter_prli(rdata);
}
}
}
/**
* fc_rport_recv_prli_req() - Handle incoming Process Login (PRLI) request
* @rdata: private remote port data
* @sp: current sequence in the PRLI exchange
* @fp: 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_seq *sp, struct fc_frame *rx_fp)
{
struct fc_lport *lport = rdata->local_port;
struct fc_exch *ep;
struct fc_frame *fp;
struct fc_frame_header *fh;
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_rjt_reason reason = ELS_RJT_UNAB;
enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
enum fc_els_spp_resp resp;
struct fc_seq_els_data rjt_data;
u32 f_ctl;
u32 fcp_parm;
u32 roles = FC_RPORT_ROLE_UNKNOWN;
rjt_data.fp = NULL;
fh = fc_frame_header_get(rx_fp);
FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
fc_rport_state(rdata));
switch (rdata->rp_state) {
case RPORT_ST_PRLI:
case RPORT_ST_READY:
reason = ELS_RJT_NONE;
break;
default:
fc_frame_free(rx_fp);
return;
break;
}
len = fr_len(rx_fp) - sizeof(*fh);
pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
if (pp == NULL) {
reason = ELS_RJT_PROT;
explan = ELS_EXPL_INV_LEN;
} else {
plen = ntohs(pp->prli.prli_len);
if ((plen % 4) != 0 || plen > len) {
reason = ELS_RJT_PROT;
explan = ELS_EXPL_INV_LEN;
} else if (plen < len) {
len = plen;
}
plen = pp->prli.prli_spp_len;
if ((plen % 4) != 0 || plen < sizeof(*spp) ||
plen > len || len < sizeof(*pp)) {
reason = ELS_RJT_PROT;
explan = ELS_EXPL_INV_LEN;
}
rspp = &pp->spp;
}
if (reason != ELS_RJT_NONE ||
(fp = fc_frame_alloc(lport, len)) == NULL) {
rjt_data.reason = reason;
rjt_data.explan = explan;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
} else {
sp = lport->tt.seq_start_next(sp);
WARN_ON(!sp);
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);
/* reinitialize remote port roles */
rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
/*
* 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;
while (len >= plen) {
spp->spp_type = rspp->spp_type;
spp->spp_type_ext = rspp->spp_type_ext;
spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
resp = FC_SPP_RESP_ACK;
if (rspp->spp_flags & FC_SPP_RPA_VAL)
resp = FC_SPP_RESP_NO_PA;
switch (rspp->spp_type) {
case 0: /* common to all FC-4 types */
break;
case FC_TYPE_FCP:
fcp_parm = ntohl(rspp->spp_params);
if (fcp_parm * FCP_SPPF_RETRY)
rdata->flags |= FC_RP_FLAGS_RETRY;
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;
spp->spp_params =
htonl(lport->service_params);
break;
default:
resp = FC_SPP_RESP_INVL;
break;
}
spp->spp_flags |= resp;
len -= plen;
rspp = (struct fc_els_spp *)((char *)rspp + plen);
spp = (struct fc_els_spp *)((char *)spp + plen);
}
/*
* Send LS_ACC. If this fails, the originator should retry.
*/
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
/*
* Get lock and re-check state.
*/
switch (rdata->rp_state) {
case RPORT_ST_PRLI:
fc_rport_enter_ready(rdata);
break;
case RPORT_ST_READY:
break;
default:
break;
}
}
fc_frame_free(rx_fp);
}
/**
* fc_rport_recv_prlo_req() - Handle incoming Process Logout (PRLO) request
* @rdata: private remote port data
* @sp: current sequence in the PRLO exchange
* @fp: 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_seq *sp,
struct fc_frame *fp)
{
struct fc_lport *lport = rdata->local_port;
struct fc_frame_header *fh;
struct fc_seq_els_data rjt_data;
fh = fc_frame_header_get(fp);
FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
fc_rport_state(rdata));
if (rdata->rp_state == RPORT_ST_DELETE) {
fc_frame_free(fp);
return;
}
rjt_data.fp = NULL;
rjt_data.reason = ELS_RJT_UNAB;
rjt_data.explan = ELS_EXPL_NONE;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
}
/**
* fc_rport_recv_logo_req() - Handle incoming Logout (LOGO) request
* @rdata: private remote port data
* @sp: current sequence in the LOGO exchange
* @fp: 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_rport_priv *rdata,
struct fc_seq *sp,
struct fc_frame *fp)
{
struct fc_frame_header *fh;
struct fc_lport *lport = rdata->local_port;
fh = fc_frame_header_get(fp);
FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n",
fc_rport_state(rdata));
if (rdata->rp_state == RPORT_ST_DELETE) {
fc_frame_free(fp);
return;
}
fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
fc_frame_free(fp);
}
static void fc_rport_flush_queue(void)
{
flush_workqueue(rport_event_queue);
}
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);
int fc_setup_rport(void)
{
rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
if (!rport_event_queue)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL(fc_setup_rport);
void fc_destroy_rport(void)
{
destroy_workqueue(rport_event_queue);
}
EXPORT_SYMBOL(fc_destroy_rport);
void fc_rport_terminate_io(struct fc_rport *rport)
{
struct fc_rport_libfc_priv *rp = rport->dd_data;
struct fc_lport *lport = rp->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);
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