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linux_dsm_epyc7002/drivers/scsi/libfc/fc_rport.c
Robert Love 42e9a92fe6 [SCSI] libfc: A modular Fibre Channel library 
libFC is composed of 4 blocks supported by an exchange manager
and a framing library. The upper 4 layers are fc_lport, fc_disc,
fc_rport and fc_fcp. A LLD that uses libfc could choose to
either use libfc's block, or using the transport template
defined in libfc.h, override one or more blocks with its own
implementation.

The EM (Exchange Manager) manages exhcanges/sequences for all
commands- ELS, CT and FCP.

The framing library frames ELS and CT commands.

The fc_lport block manages the library's representation of the
host's FC enabled ports.

The fc_disc block manages discovery of targets as well as
handling changes that occur in the FC fabric (via. RSCN events).

The fc_rport block manages the library's representation of other
entities in the FC fabric. Currently the library uses this block
for targets, its peer when in point-to-point mode and the
directory server, but can be extended for other entities if
needed.

The fc_fcp block interacts with the scsi-ml and handles all
I/O.

Signed-off-by: Robert Love <robert.w.love@intel.com>
[jejb: added include of delay.h to fix ppc64 compile prob spotted by sfr]
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-12-29 11:24:33 -06:00

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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>
static int fc_rport_debug;
#define FC_DEBUG_RPORT(fmt...) \
do { \
if (fc_rport_debug) \
FC_DBG(fmt); \
} while (0)
struct workqueue_struct *rport_event_queue;
static void fc_rport_enter_plogi(struct fc_rport *);
static void fc_rport_enter_prli(struct fc_rport *);
static void fc_rport_enter_rtv(struct fc_rport *);
static void fc_rport_enter_ready(struct fc_rport *);
static void fc_rport_enter_logo(struct fc_rport *);
static void fc_rport_recv_plogi_req(struct fc_rport *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_recv_prli_req(struct fc_rport *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_recv_prlo_req(struct fc_rport *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_recv_logo_req(struct fc_rport *,
struct fc_seq *, struct fc_frame *);
static void fc_rport_timeout(struct work_struct *);
static void fc_rport_error(struct fc_rport *, struct fc_frame *);
static void fc_rport_work(struct work_struct *);
static const char *fc_rport_state_names[] = {
[RPORT_ST_NONE] = "None",
[RPORT_ST_INIT] = "Init",
[RPORT_ST_PLOGI] = "PLOGI",
[RPORT_ST_PRLI] = "PRLI",
[RPORT_ST_RTV] = "RTV",
[RPORT_ST_READY] = "Ready",
[RPORT_ST_LOGO] = "LOGO",
};
static void fc_rport_rogue_destroy(struct device *dev)
{
struct fc_rport *rport = dev_to_rport(dev);
FC_DEBUG_RPORT("Destroying rogue rport (%6x)\n", rport->port_id);
kfree(rport);
}
struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *dp)
{
struct fc_rport *rport;
struct fc_rport_libfc_priv *rdata;
rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL);
if (!rport)
return NULL;
rdata = RPORT_TO_PRIV(rport);
rport->dd_data = rdata;
rport->port_id = dp->ids.port_id;
rport->port_name = dp->ids.port_name;
rport->node_name = dp->ids.node_name;
rport->roles = dp->ids.roles;
rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
/*
* Note: all this libfc rogue rport code will be removed for
* upstream so it fine that this is really ugly and hacky right now.
*/
device_initialize(&rport->dev);
rport->dev.release = fc_rport_rogue_destroy;
mutex_init(&rdata->rp_mutex);
rdata->local_port = dp->lp;
rdata->trans_state = FC_PORTSTATE_ROGUE;
rdata->rp_state = RPORT_ST_INIT;
rdata->event = RPORT_EV_NONE;
rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
rdata->ops = NULL;
rdata->e_d_tov = dp->lp->e_d_tov;
rdata->r_a_tov = dp->lp->r_a_tov;
INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout);
INIT_WORK(&rdata->event_work, fc_rport_work);
/*
* For good measure, but not necessary as we should only
* add REAL rport to the lport list.
*/
INIT_LIST_HEAD(&rdata->peers);
return rport;
}
/**
* fc_rport_state - return a string for the state the rport is in
* @rport: The rport whose state we want to get a string for
*/
static const char *fc_rport_state(struct fc_rport *rport)
{
const char *cp;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
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
* @rport: 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 *rport,
enum fc_rport_state new)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
if (rdata->rp_state != new)
rdata->retries = 0;
rdata->rp_state = new;
}
static void fc_rport_work(struct work_struct *work)
{
struct fc_rport_libfc_priv *rdata =
container_of(work, struct fc_rport_libfc_priv, event_work);
enum fc_rport_event event;
enum fc_rport_trans_state trans_state;
struct fc_lport *lport = rdata->local_port;
struct fc_rport_operations *rport_ops;
struct fc_rport *rport = PRIV_TO_RPORT(rdata);
mutex_lock(&rdata->rp_mutex);
event = rdata->event;
rport_ops = rdata->ops;
if (event == RPORT_EV_CREATED) {
struct fc_rport *new_rport;
struct fc_rport_libfc_priv *new_rdata;
struct fc_rport_identifiers ids;
ids.port_id = rport->port_id;
ids.roles = rport->roles;
ids.port_name = rport->port_name;
ids.node_name = rport->node_name;
mutex_unlock(&rdata->rp_mutex);
new_rport = fc_remote_port_add(lport->host, 0, &ids);
if (new_rport) {
/*
* Switch from the rogue rport to the rport
* returned by the FC class.
*/
new_rport->maxframe_size = rport->maxframe_size;
new_rdata = new_rport->dd_data;
new_rdata->e_d_tov = rdata->e_d_tov;
new_rdata->r_a_tov = rdata->r_a_tov;
new_rdata->ops = rdata->ops;
new_rdata->local_port = rdata->local_port;
new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
new_rdata->trans_state = FC_PORTSTATE_REAL;
mutex_init(&new_rdata->rp_mutex);
INIT_DELAYED_WORK(&new_rdata->retry_work,
fc_rport_timeout);
INIT_LIST_HEAD(&new_rdata->peers);
INIT_WORK(&new_rdata->event_work, fc_rport_work);
fc_rport_state_enter(new_rport, RPORT_ST_READY);
} else {
FC_DBG("Failed to create the rport for port "
"(%6x).\n", ids.port_id);
event = RPORT_EV_FAILED;
}
put_device(&rport->dev);
rport = new_rport;
rdata = new_rport->dd_data;
if (rport_ops->event_callback)
rport_ops->event_callback(lport, rport, event);
} else if ((event == RPORT_EV_FAILED) ||
(event == RPORT_EV_LOGO) ||
(event == RPORT_EV_STOP)) {
trans_state = rdata->trans_state;
mutex_unlock(&rdata->rp_mutex);
if (rport_ops->event_callback)
rport_ops->event_callback(lport, rport, event);
if (trans_state == FC_PORTSTATE_ROGUE)
put_device(&rport->dev);
else
fc_remote_port_delete(rport);
} else
mutex_unlock(&rdata->rp_mutex);
}
/**
* fc_rport_login - Start the remote port login state machine
* @rport: Fibre Channel 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 *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
mutex_lock(&rdata->rp_mutex);
FC_DEBUG_RPORT("Login to port (%6x)\n", rport->port_id);
fc_rport_enter_plogi(rport);
mutex_unlock(&rdata->rp_mutex);
return 0;
}
/**
* fc_rport_logoff - Logoff and remove an rport
* @rport: Fibre Channel remote port to be removed
*
* 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 *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
mutex_lock(&rdata->rp_mutex);
FC_DEBUG_RPORT("Remove port (%6x)\n", rport->port_id);
fc_rport_enter_logo(rport);
/*
* Change the state to NONE so that we discard
* the response.
*/
fc_rport_state_enter(rport, RPORT_ST_NONE);
mutex_unlock(&rdata->rp_mutex);
cancel_delayed_work_sync(&rdata->retry_work);
mutex_lock(&rdata->rp_mutex);
rdata->event = RPORT_EV_STOP;
queue_work(rport_event_queue, &rdata->event_work);
mutex_unlock(&rdata->rp_mutex);
return 0;
}
/**
* fc_rport_enter_ready - The rport is ready
* @rport: Fibre Channel 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 *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
fc_rport_state_enter(rport, RPORT_ST_READY);
FC_DEBUG_RPORT("Port (%6x) is Ready\n", rport->port_id);
rdata->event = RPORT_EV_CREATED;
queue_work(rport_event_queue, &rdata->event_work);
}
/**
* fc_rport_timeout - Handler for the retry_work timer.
* @work: The work struct of the fc_rport_libfc_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_libfc_priv *rdata =
container_of(work, struct fc_rport_libfc_priv, retry_work.work);
struct fc_rport *rport = PRIV_TO_RPORT(rdata);
mutex_lock(&rdata->rp_mutex);
switch (rdata->rp_state) {
case RPORT_ST_PLOGI:
fc_rport_enter_plogi(rport);
break;
case RPORT_ST_PRLI:
fc_rport_enter_prli(rport);
break;
case RPORT_ST_RTV:
fc_rport_enter_rtv(rport);
break;
case RPORT_ST_LOGO:
fc_rport_enter_logo(rport);
break;
case RPORT_ST_READY:
case RPORT_ST_INIT:
case RPORT_ST_NONE:
break;
}
mutex_unlock(&rdata->rp_mutex);
put_device(&rport->dev);
}
/**
* fc_rport_error - Handler for any errors
* @rport: The fc_rport object
* @fp: The frame pointer
*
* If the error was caused by a resource allocation failure
* then wait for half a second and retry, otherwise retry
* immediately.
*
* Locking Note: The rport lock is expected to be held before
* calling this routine
*/
static void fc_rport_error(struct fc_rport *rport, struct fc_frame *fp)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
unsigned long delay = 0;
FC_DEBUG_RPORT("Error %ld in state %s, retries %d\n",
PTR_ERR(fp), fc_rport_state(rport), rdata->retries);
if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
/*
* Memory allocation failure, or the exchange timed out.
* Retry after delay
*/
if (rdata->retries < rdata->local_port->max_retry_count) {
rdata->retries++;
if (!fp)
delay = msecs_to_jiffies(500);
get_device(&rport->dev);
schedule_delayed_work(&rdata->retry_work, delay);
} else {
switch (rdata->rp_state) {
case RPORT_ST_PLOGI:
case RPORT_ST_PRLI:
case RPORT_ST_LOGO:
rdata->event = RPORT_EV_FAILED;
queue_work(rport_event_queue,
&rdata->event_work);
break;
case RPORT_ST_RTV:
fc_rport_enter_ready(rport);
break;
case RPORT_ST_NONE:
case RPORT_ST_READY:
case RPORT_ST_INIT:
break;
}
}
}
}
/**
* fc_rport_plogi_recv_resp - Handle incoming ELS PLOGI response
* @sp: current sequence in the PLOGI exchange
* @fp: response frame
* @rp_arg: Fibre Channel remote port
*
* 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 *rp_arg)
{
struct fc_rport *rport = rp_arg;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
struct fc_els_flogi *plp;
unsigned int tov;
u16 csp_seq;
u16 cssp_seq;
u8 op;
mutex_lock(&rdata->rp_mutex);
FC_DEBUG_RPORT("Received a PLOGI response from port (%6x)\n",
rport->port_id);
if (rdata->rp_state != RPORT_ST_PLOGI) {
FC_DBG("Received a PLOGI response, but in state %s\n",
fc_rport_state(rport));
goto out;
}
if (IS_ERR(fp)) {
fc_rport_error(rport, fp);
goto err;
}
op = fc_frame_payload_op(fp);
if (op == ELS_LS_ACC &&
(plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
rport->port_name = get_unaligned_be64(&plp->fl_wwpn);
rport->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;
rport->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 (rport->port_id >= FC_FID_DOM_MGR)
fc_rport_enter_ready(rport);
else
fc_rport_enter_prli(rport);
} else
fc_rport_error(rport, fp);
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
put_device(&rport->dev);
}
/**
* fc_rport_enter_plogi - Send Port Login (PLOGI) request to peer
* @rport: Fibre Channel remote port to send 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 *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
struct fc_frame *fp;
FC_DEBUG_RPORT("Port (%6x) entered PLOGI state from %s state\n",
rport->port_id, fc_rport_state(rport));
fc_rport_state_enter(rport, RPORT_ST_PLOGI);
rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
if (!fp) {
fc_rport_error(rport, fp);
return;
}
rdata->e_d_tov = lport->e_d_tov;
if (!lport->tt.elsct_send(lport, rport, fp, ELS_PLOGI,
fc_rport_plogi_resp, rport, lport->e_d_tov))
fc_rport_error(rport, fp);
else
get_device(&rport->dev);
}
/**
* fc_rport_prli_resp - Process Login (PRLI) response handler
* @sp: current sequence in the PRLI exchange
* @fp: response frame
* @rp_arg: Fibre Channel remote port
*
* 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 *rp_arg)
{
struct fc_rport *rport = rp_arg;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
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_DEBUG_RPORT("Received a PRLI response from port (%6x)\n",
rport->port_id);
if (rdata->rp_state != RPORT_ST_PRLI) {
FC_DBG("Received a PRLI response, but in state %s\n",
fc_rport_state(rport));
goto out;
}
if (IS_ERR(fp)) {
fc_rport_error(rport, fp);
goto err;
}
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;
}
rport->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;
rport->roles = roles;
fc_rport_enter_rtv(rport);
} else {
FC_DBG("Bad ELS response\n");
rdata->event = RPORT_EV_FAILED;
queue_work(rport_event_queue, &rdata->event_work);
}
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
put_device(&rport->dev);
}
/**
* fc_rport_logo_resp - Logout (LOGO) response handler
* @sp: current sequence in the LOGO exchange
* @fp: response frame
* @rp_arg: Fibre Channel remote port
*
* 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 *rp_arg)
{
struct fc_rport *rport = rp_arg;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
u8 op;
mutex_lock(&rdata->rp_mutex);
FC_DEBUG_RPORT("Received a LOGO response from port (%6x)\n",
rport->port_id);
if (IS_ERR(fp)) {
fc_rport_error(rport, fp);
goto err;
}
if (rdata->rp_state != RPORT_ST_LOGO) {
FC_DEBUG_RPORT("Received a LOGO response, but in state %s\n",
fc_rport_state(rport));
goto out;
}
op = fc_frame_payload_op(fp);
if (op == ELS_LS_ACC) {
fc_rport_enter_rtv(rport);
} else {
FC_DBG("Bad ELS response\n");
rdata->event = RPORT_EV_LOGO;
queue_work(rport_event_queue, &rdata->event_work);
}
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
put_device(&rport->dev);
}
/**
* fc_rport_enter_prli - Send Process Login (PRLI) request to peer
* @rport: Fibre Channel remote port to send PRLI to
*
* Locking Note: The rport lock is expected to be held before calling
* this routine.
*/
static void fc_rport_enter_prli(struct fc_rport *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
struct {
struct fc_els_prli prli;
struct fc_els_spp spp;
} *pp;
struct fc_frame *fp;
FC_DEBUG_RPORT("Port (%6x) entered PRLI state from %s state\n",
rport->port_id, fc_rport_state(rport));
fc_rport_state_enter(rport, RPORT_ST_PRLI);
fp = fc_frame_alloc(lport, sizeof(*pp));
if (!fp) {
fc_rport_error(rport, fp);
return;
}
if (!lport->tt.elsct_send(lport, rport, fp, ELS_PRLI,
fc_rport_prli_resp, rport, lport->e_d_tov))
fc_rport_error(rport, fp);
else
get_device(&rport->dev);
}
/**
* fc_rport_els_rtv_resp - Request Timeout Value response handler
* @sp: current sequence in the RTV exchange
* @fp: response frame
* @rp_arg: Fibre Channel remote port
*
* 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 *rp_arg)
{
struct fc_rport *rport = rp_arg;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
u8 op;
mutex_lock(&rdata->rp_mutex);
FC_DEBUG_RPORT("Received a RTV response from port (%6x)\n",
rport->port_id);
if (rdata->rp_state != RPORT_ST_RTV) {
FC_DBG("Received a RTV response, but in state %s\n",
fc_rport_state(rport));
goto out;
}
if (IS_ERR(fp)) {
fc_rport_error(rport, 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(rport);
out:
fc_frame_free(fp);
err:
mutex_unlock(&rdata->rp_mutex);
put_device(&rport->dev);
}
/**
* fc_rport_enter_rtv - Send Request Timeout Value (RTV) request to peer
* @rport: Fibre Channel remote port to send RTV to
*
* Locking Note: The rport lock is expected to be held before calling
* this routine.
*/
static void fc_rport_enter_rtv(struct fc_rport *rport)
{
struct fc_frame *fp;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
FC_DEBUG_RPORT("Port (%6x) entered RTV state from %s state\n",
rport->port_id, fc_rport_state(rport));
fc_rport_state_enter(rport, RPORT_ST_RTV);
fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv));
if (!fp) {
fc_rport_error(rport, fp);
return;
}
if (!lport->tt.elsct_send(lport, rport, fp, ELS_RTV,
fc_rport_rtv_resp, rport, lport->e_d_tov))
fc_rport_error(rport, fp);
else
get_device(&rport->dev);
}
/**
* fc_rport_enter_logo - Send Logout (LOGO) request to peer
* @rport: Fibre Channel remote port to send LOGO to
*
* Locking Note: The rport lock is expected to be held before calling
* this routine.
*/
static void fc_rport_enter_logo(struct fc_rport *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
struct fc_frame *fp;
FC_DEBUG_RPORT("Port (%6x) entered LOGO state from %s state\n",
rport->port_id, fc_rport_state(rport));
fc_rport_state_enter(rport, RPORT_ST_LOGO);
fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo));
if (!fp) {
fc_rport_error(rport, fp);
return;
}
if (!lport->tt.elsct_send(lport, rport, fp, ELS_LOGO,
fc_rport_logo_resp, rport, lport->e_d_tov))
fc_rport_error(rport, fp);
else
get_device(&rport->dev);
}
/**
* fc_rport_recv_req - Receive a request from a rport
* @sp: current sequence in the PLOGI exchange
* @fp: response frame
* @rp_arg: Fibre Channel 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.
*/
void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
struct fc_rport *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
struct fc_frame_header *fh;
struct fc_seq_els_data els_data;
u8 op;
mutex_lock(&rdata->rp_mutex);
els_data.fp = NULL;
els_data.explan = ELS_EXPL_NONE;
els_data.reason = ELS_RJT_NONE;
fh = fc_frame_header_get(fp);
if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) {
op = fc_frame_payload_op(fp);
switch (op) {
case ELS_PLOGI:
fc_rport_recv_plogi_req(rport, sp, fp);
break;
case ELS_PRLI:
fc_rport_recv_prli_req(rport, sp, fp);
break;
case ELS_PRLO:
fc_rport_recv_prlo_req(rport, sp, fp);
break;
case ELS_LOGO:
fc_rport_recv_logo_req(rport, 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
* @rport: Fibre Channel remote port that initiated PLOGI
* @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 *rport,
struct fc_seq *sp, struct fc_frame *rx_fp)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
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_DEBUG_RPORT("Received PLOGI request from port (%6x) "
"while in state %s\n", ntoh24(fh->fh_s_id),
fc_rport_state(rport));
sid = ntoh24(fh->fh_s_id);
pl = fc_frame_payload_get(fp, sizeof(*pl));
if (!pl) {
FC_DBG("incoming PLOGI from %x too short\n", sid);
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_DEBUG_RPORT("incoming PLOGI from %6x wwpn %llx state INIT "
"- reject\n", sid, wwpn);
reject = ELS_RJT_UNSUP;
break;
case RPORT_ST_PLOGI:
FC_DEBUG_RPORT("incoming PLOGI from %x in PLOGI state %d\n",
sid, rdata->rp_state);
if (wwpn < lport->wwpn)
reject = ELS_RJT_INPROG;
break;
case RPORT_ST_PRLI:
case RPORT_ST_READY:
FC_DEBUG_RPORT("incoming PLOGI from %x in logged-in state %d "
"- ignored for now\n", sid, rdata->rp_state);
/* XXX TBD - should reset */
break;
case RPORT_ST_NONE:
default:
FC_DEBUG_RPORT("incoming PLOGI from %x in unexpected "
"state %d\n", sid, rdata->rp_state);
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);
fc_rport_set_name(rport, wwpn, wwnn);
/*
* Get session payload size from incoming PLOGI.
*/
rport->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(rport);
}
}
}
/**
* fc_rport_recv_prli_req - Handle incoming Process Login (PRLI) request
* @rport: Fibre Channel remote port that initiated PRLI
* @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 *rport,
struct fc_seq *sp, struct fc_frame *rx_fp)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
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_DEBUG_RPORT("Received PRLI request from port (%6x) "
"while in state %s\n", ntoh24(fh->fh_s_id),
fc_rport_state(rport));
switch (rdata->rp_state) {
case RPORT_ST_PRLI:
case RPORT_ST_READY:
reason = ELS_RJT_NONE;
break;
default:
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);
/*
* 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;
rport->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;
rport->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(rport);
break;
case RPORT_ST_READY:
break;
default:
break;
}
}
fc_frame_free(rx_fp);
}
/**
* fc_rport_recv_prlo_req - Handle incoming Process Logout (PRLO) request
* @rport: Fibre Channel remote port that initiated PRLO
* @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 *rport, struct fc_seq *sp,
struct fc_frame *fp)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
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_DEBUG_RPORT("Received PRLO request from port (%6x) "
"while in state %s\n", ntoh24(fh->fh_s_id),
fc_rport_state(rport));
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
* @rport: Fibre Channel remote port that initiated LOGO
* @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 *rport, struct fc_seq *sp,
struct fc_frame *fp)
{
struct fc_frame_header *fh;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
fh = fc_frame_header_get(fp);
FC_DEBUG_RPORT("Received LOGO request from port (%6x) "
"while in state %s\n", ntoh24(fh->fh_s_id),
fc_rport_state(rport));
rdata->event = RPORT_EV_LOGO;
queue_work(rport_event_queue, &rdata->event_work);
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_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;
return 0;
}
EXPORT_SYMBOL(fc_rport_init);
int fc_setup_rport()
{
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()
{
destroy_workqueue(rport_event_queue);
}
EXPORT_SYMBOL(fc_destroy_rport);
void fc_rport_terminate_io(struct fc_rport *rport)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
lport->tt.exch_mgr_reset(lport->emp, 0, rport->port_id);
lport->tt.exch_mgr_reset(lport->emp, rport->port_id, 0);
}
EXPORT_SYMBOL(fc_rport_terminate_io);
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