linux/drivers/scsi/scsi_transport_srp.c
Thomas Gleixner 0e08699496 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 502
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation version 2 of the license this program
  is distributed in the hope that 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 1 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081207.195075312@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:56 +02:00

896 lines
24 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* SCSI RDMA (SRP) transport class
*
* Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_srp.h>
#include "scsi_priv.h"
struct srp_host_attrs {
atomic_t next_port_id;
};
#define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
#define SRP_HOST_ATTRS 0
#define SRP_RPORT_ATTRS 8
struct srp_internal {
struct scsi_transport_template t;
struct srp_function_template *f;
struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
struct transport_container rport_attr_cont;
};
static int scsi_is_srp_rport(const struct device *dev);
#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
#define dev_to_rport(d) container_of(d, struct srp_rport, dev)
#define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent)
static inline struct Scsi_Host *rport_to_shost(struct srp_rport *r)
{
return dev_to_shost(r->dev.parent);
}
static int find_child_rport(struct device *dev, void *data)
{
struct device **child = data;
if (scsi_is_srp_rport(dev)) {
WARN_ON_ONCE(*child);
*child = dev;
}
return 0;
}
static inline struct srp_rport *shost_to_rport(struct Scsi_Host *shost)
{
struct device *child = NULL;
WARN_ON_ONCE(device_for_each_child(&shost->shost_gendev, &child,
find_child_rport) < 0);
return child ? dev_to_rport(child) : NULL;
}
/**
* srp_tmo_valid() - check timeout combination validity
* @reconnect_delay: Reconnect delay in seconds.
* @fast_io_fail_tmo: Fast I/O fail timeout in seconds.
* @dev_loss_tmo: Device loss timeout in seconds.
*
* The combination of the timeout parameters must be such that SCSI commands
* are finished in a reasonable time. Hence do not allow the fast I/O fail
* timeout to exceed SCSI_DEVICE_BLOCK_MAX_TIMEOUT nor allow dev_loss_tmo to
* exceed that limit if failing I/O fast has been disabled. Furthermore, these
* parameters must be such that multipath can detect failed paths timely.
* Hence do not allow all three parameters to be disabled simultaneously.
*/
int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo, long dev_loss_tmo)
{
if (reconnect_delay < 0 && fast_io_fail_tmo < 0 && dev_loss_tmo < 0)
return -EINVAL;
if (reconnect_delay == 0)
return -EINVAL;
if (fast_io_fail_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
return -EINVAL;
if (fast_io_fail_tmo < 0 &&
dev_loss_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
return -EINVAL;
if (dev_loss_tmo >= LONG_MAX / HZ)
return -EINVAL;
if (fast_io_fail_tmo >= 0 && dev_loss_tmo >= 0 &&
fast_io_fail_tmo >= dev_loss_tmo)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(srp_tmo_valid);
static int srp_host_setup(struct transport_container *tc, struct device *dev,
struct device *cdev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);
atomic_set(&srp_host->next_port_id, 0);
return 0;
}
static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
NULL, NULL);
static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
NULL, NULL, NULL);
static ssize_t
show_srp_rport_id(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
return sprintf(buf, "%16phC\n", rport->port_id);
}
static DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
static const struct {
u32 value;
char *name;
} srp_rport_role_names[] = {
{SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
{SRP_RPORT_ROLE_TARGET, "SRP Target"},
};
static ssize_t
show_srp_rport_roles(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
int i;
char *name = NULL;
for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
if (srp_rport_role_names[i].value == rport->roles) {
name = srp_rport_role_names[i].name;
break;
}
return sprintf(buf, "%s\n", name ? : "unknown");
}
static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
static ssize_t store_srp_rport_delete(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
struct Scsi_Host *shost = dev_to_shost(dev);
struct srp_internal *i = to_srp_internal(shost->transportt);
if (i->f->rport_delete) {
i->f->rport_delete(rport);
return count;
} else {
return -ENOSYS;
}
}
static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);
static ssize_t show_srp_rport_state(struct device *dev,
struct device_attribute *attr,
char *buf)
{
static const char *const state_name[] = {
[SRP_RPORT_RUNNING] = "running",
[SRP_RPORT_BLOCKED] = "blocked",
[SRP_RPORT_FAIL_FAST] = "fail-fast",
[SRP_RPORT_LOST] = "lost",
};
struct srp_rport *rport = transport_class_to_srp_rport(dev);
enum srp_rport_state state = rport->state;
return sprintf(buf, "%s\n",
(unsigned)state < ARRAY_SIZE(state_name) ?
state_name[state] : "???");
}
static DEVICE_ATTR(state, S_IRUGO, show_srp_rport_state, NULL);
static ssize_t srp_show_tmo(char *buf, int tmo)
{
return tmo >= 0 ? sprintf(buf, "%d\n", tmo) : sprintf(buf, "off\n");
}
int srp_parse_tmo(int *tmo, const char *buf)
{
int res = 0;
if (strncmp(buf, "off", 3) != 0)
res = kstrtoint(buf, 0, tmo);
else
*tmo = -1;
return res;
}
EXPORT_SYMBOL(srp_parse_tmo);
static ssize_t show_reconnect_delay(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
return srp_show_tmo(buf, rport->reconnect_delay);
}
static ssize_t store_reconnect_delay(struct device *dev,
struct device_attribute *attr,
const char *buf, const size_t count)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
int res, delay;
res = srp_parse_tmo(&delay, buf);
if (res)
goto out;
res = srp_tmo_valid(delay, rport->fast_io_fail_tmo,
rport->dev_loss_tmo);
if (res)
goto out;
if (rport->reconnect_delay <= 0 && delay > 0 &&
rport->state != SRP_RPORT_RUNNING) {
queue_delayed_work(system_long_wq, &rport->reconnect_work,
delay * HZ);
} else if (delay <= 0) {
cancel_delayed_work(&rport->reconnect_work);
}
rport->reconnect_delay = delay;
res = count;
out:
return res;
}
static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR, show_reconnect_delay,
store_reconnect_delay);
static ssize_t show_failed_reconnects(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
return sprintf(buf, "%d\n", rport->failed_reconnects);
}
static DEVICE_ATTR(failed_reconnects, S_IRUGO, show_failed_reconnects, NULL);
static ssize_t show_srp_rport_fast_io_fail_tmo(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
return srp_show_tmo(buf, rport->fast_io_fail_tmo);
}
static ssize_t store_srp_rport_fast_io_fail_tmo(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
int res;
int fast_io_fail_tmo;
res = srp_parse_tmo(&fast_io_fail_tmo, buf);
if (res)
goto out;
res = srp_tmo_valid(rport->reconnect_delay, fast_io_fail_tmo,
rport->dev_loss_tmo);
if (res)
goto out;
rport->fast_io_fail_tmo = fast_io_fail_tmo;
res = count;
out:
return res;
}
static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR,
show_srp_rport_fast_io_fail_tmo,
store_srp_rport_fast_io_fail_tmo);
static ssize_t show_srp_rport_dev_loss_tmo(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
return srp_show_tmo(buf, rport->dev_loss_tmo);
}
static ssize_t store_srp_rport_dev_loss_tmo(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct srp_rport *rport = transport_class_to_srp_rport(dev);
int res;
int dev_loss_tmo;
res = srp_parse_tmo(&dev_loss_tmo, buf);
if (res)
goto out;
res = srp_tmo_valid(rport->reconnect_delay, rport->fast_io_fail_tmo,
dev_loss_tmo);
if (res)
goto out;
rport->dev_loss_tmo = dev_loss_tmo;
res = count;
out:
return res;
}
static DEVICE_ATTR(dev_loss_tmo, S_IRUGO | S_IWUSR,
show_srp_rport_dev_loss_tmo,
store_srp_rport_dev_loss_tmo);
static int srp_rport_set_state(struct srp_rport *rport,
enum srp_rport_state new_state)
{
enum srp_rport_state old_state = rport->state;
lockdep_assert_held(&rport->mutex);
switch (new_state) {
case SRP_RPORT_RUNNING:
switch (old_state) {
case SRP_RPORT_LOST:
goto invalid;
default:
break;
}
break;
case SRP_RPORT_BLOCKED:
switch (old_state) {
case SRP_RPORT_RUNNING:
break;
default:
goto invalid;
}
break;
case SRP_RPORT_FAIL_FAST:
switch (old_state) {
case SRP_RPORT_LOST:
goto invalid;
default:
break;
}
break;
case SRP_RPORT_LOST:
break;
}
rport->state = new_state;
return 0;
invalid:
return -EINVAL;
}
/**
* srp_reconnect_work() - reconnect and schedule a new attempt if necessary
* @work: Work structure used for scheduling this operation.
*/
static void srp_reconnect_work(struct work_struct *work)
{
struct srp_rport *rport = container_of(to_delayed_work(work),
struct srp_rport, reconnect_work);
struct Scsi_Host *shost = rport_to_shost(rport);
int delay, res;
res = srp_reconnect_rport(rport);
if (res != 0) {
shost_printk(KERN_ERR, shost,
"reconnect attempt %d failed (%d)\n",
++rport->failed_reconnects, res);
delay = rport->reconnect_delay *
min(100, max(1, rport->failed_reconnects - 10));
if (delay > 0)
queue_delayed_work(system_long_wq,
&rport->reconnect_work, delay * HZ);
}
}
static void __rport_fail_io_fast(struct srp_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
struct srp_internal *i;
lockdep_assert_held(&rport->mutex);
if (srp_rport_set_state(rport, SRP_RPORT_FAIL_FAST))
return;
/*
* Call scsi_target_block() to wait for ongoing shost->queuecommand()
* calls before invoking i->f->terminate_rport_io().
*/
scsi_target_block(rport->dev.parent);
scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE);
/* Involve the LLD if possible to terminate all I/O on the rport. */
i = to_srp_internal(shost->transportt);
if (i->f->terminate_rport_io)
i->f->terminate_rport_io(rport);
}
/**
* rport_fast_io_fail_timedout() - fast I/O failure timeout handler
* @work: Work structure used for scheduling this operation.
*/
static void rport_fast_io_fail_timedout(struct work_struct *work)
{
struct srp_rport *rport = container_of(to_delayed_work(work),
struct srp_rport, fast_io_fail_work);
struct Scsi_Host *shost = rport_to_shost(rport);
pr_info("fast_io_fail_tmo expired for SRP %s / %s.\n",
dev_name(&rport->dev), dev_name(&shost->shost_gendev));
mutex_lock(&rport->mutex);
if (rport->state == SRP_RPORT_BLOCKED)
__rport_fail_io_fast(rport);
mutex_unlock(&rport->mutex);
}
/**
* rport_dev_loss_timedout() - device loss timeout handler
* @work: Work structure used for scheduling this operation.
*/
static void rport_dev_loss_timedout(struct work_struct *work)
{
struct srp_rport *rport = container_of(to_delayed_work(work),
struct srp_rport, dev_loss_work);
struct Scsi_Host *shost = rport_to_shost(rport);
struct srp_internal *i = to_srp_internal(shost->transportt);
pr_info("dev_loss_tmo expired for SRP %s / %s.\n",
dev_name(&rport->dev), dev_name(&shost->shost_gendev));
mutex_lock(&rport->mutex);
WARN_ON(srp_rport_set_state(rport, SRP_RPORT_LOST) != 0);
scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE);
mutex_unlock(&rport->mutex);
i->f->rport_delete(rport);
}
static void __srp_start_tl_fail_timers(struct srp_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
int delay, fast_io_fail_tmo, dev_loss_tmo;
lockdep_assert_held(&rport->mutex);
delay = rport->reconnect_delay;
fast_io_fail_tmo = rport->fast_io_fail_tmo;
dev_loss_tmo = rport->dev_loss_tmo;
pr_debug("%s current state: %d\n", dev_name(&shost->shost_gendev),
rport->state);
if (rport->state == SRP_RPORT_LOST)
return;
if (delay > 0)
queue_delayed_work(system_long_wq, &rport->reconnect_work,
1UL * delay * HZ);
if ((fast_io_fail_tmo >= 0 || dev_loss_tmo >= 0) &&
srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) {
pr_debug("%s new state: %d\n", dev_name(&shost->shost_gendev),
rport->state);
scsi_target_block(&shost->shost_gendev);
if (fast_io_fail_tmo >= 0)
queue_delayed_work(system_long_wq,
&rport->fast_io_fail_work,
1UL * fast_io_fail_tmo * HZ);
if (dev_loss_tmo >= 0)
queue_delayed_work(system_long_wq,
&rport->dev_loss_work,
1UL * dev_loss_tmo * HZ);
}
}
/**
* srp_start_tl_fail_timers() - start the transport layer failure timers
* @rport: SRP target port.
*
* Start the transport layer fast I/O failure and device loss timers. Do not
* modify a timer that was already started.
*/
void srp_start_tl_fail_timers(struct srp_rport *rport)
{
mutex_lock(&rport->mutex);
__srp_start_tl_fail_timers(rport);
mutex_unlock(&rport->mutex);
}
EXPORT_SYMBOL(srp_start_tl_fail_timers);
/**
* srp_reconnect_rport() - reconnect to an SRP target port
* @rport: SRP target port.
*
* Blocks SCSI command queueing before invoking reconnect() such that
* queuecommand() won't be invoked concurrently with reconnect() from outside
* the SCSI EH. This is important since a reconnect() implementation may
* reallocate resources needed by queuecommand().
*
* Notes:
* - This function neither waits until outstanding requests have finished nor
* tries to abort these. It is the responsibility of the reconnect()
* function to finish outstanding commands before reconnecting to the target
* port.
* - It is the responsibility of the caller to ensure that the resources
* reallocated by the reconnect() function won't be used while this function
* is in progress. One possible strategy is to invoke this function from
* the context of the SCSI EH thread only. Another possible strategy is to
* lock the rport mutex inside each SCSI LLD callback that can be invoked by
* the SCSI EH (the scsi_host_template.eh_*() functions and also the
* scsi_host_template.queuecommand() function).
*/
int srp_reconnect_rport(struct srp_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
struct srp_internal *i = to_srp_internal(shost->transportt);
struct scsi_device *sdev;
int res;
pr_debug("SCSI host %s\n", dev_name(&shost->shost_gendev));
res = mutex_lock_interruptible(&rport->mutex);
if (res)
goto out;
scsi_target_block(&shost->shost_gendev);
res = rport->state != SRP_RPORT_LOST ? i->f->reconnect(rport) : -ENODEV;
pr_debug("%s (state %d): transport.reconnect() returned %d\n",
dev_name(&shost->shost_gendev), rport->state, res);
if (res == 0) {
cancel_delayed_work(&rport->fast_io_fail_work);
cancel_delayed_work(&rport->dev_loss_work);
rport->failed_reconnects = 0;
srp_rport_set_state(rport, SRP_RPORT_RUNNING);
scsi_target_unblock(&shost->shost_gendev, SDEV_RUNNING);
/*
* If the SCSI error handler has offlined one or more devices,
* invoking scsi_target_unblock() won't change the state of
* these devices into running so do that explicitly.
*/
shost_for_each_device(sdev, shost) {
mutex_lock(&sdev->state_mutex);
if (sdev->sdev_state == SDEV_OFFLINE)
sdev->sdev_state = SDEV_RUNNING;
mutex_unlock(&sdev->state_mutex);
}
} else if (rport->state == SRP_RPORT_RUNNING) {
/*
* srp_reconnect_rport() has been invoked with fast_io_fail
* and dev_loss off. Mark the port as failed and start the TL
* failure timers if these had not yet been started.
*/
__rport_fail_io_fast(rport);
scsi_target_unblock(&shost->shost_gendev,
SDEV_TRANSPORT_OFFLINE);
__srp_start_tl_fail_timers(rport);
} else if (rport->state != SRP_RPORT_BLOCKED) {
scsi_target_unblock(&shost->shost_gendev,
SDEV_TRANSPORT_OFFLINE);
}
mutex_unlock(&rport->mutex);
out:
return res;
}
EXPORT_SYMBOL(srp_reconnect_rport);
/**
* srp_timed_out() - SRP transport intercept of the SCSI timeout EH
* @scmd: SCSI command.
*
* If a timeout occurs while an rport is in the blocked state, ask the SCSI
* EH to continue waiting (BLK_EH_RESET_TIMER). Otherwise let the SCSI core
* handle the timeout (BLK_EH_DONE).
*
* Note: This function is called from soft-IRQ context and with the request
* queue lock held.
*/
enum blk_eh_timer_return srp_timed_out(struct scsi_cmnd *scmd)
{
struct scsi_device *sdev = scmd->device;
struct Scsi_Host *shost = sdev->host;
struct srp_internal *i = to_srp_internal(shost->transportt);
struct srp_rport *rport = shost_to_rport(shost);
pr_debug("timeout for sdev %s\n", dev_name(&sdev->sdev_gendev));
return rport && rport->fast_io_fail_tmo < 0 &&
rport->dev_loss_tmo < 0 &&
i->f->reset_timer_if_blocked && scsi_device_blocked(sdev) ?
BLK_EH_RESET_TIMER : BLK_EH_DONE;
}
EXPORT_SYMBOL(srp_timed_out);
static void srp_rport_release(struct device *dev)
{
struct srp_rport *rport = dev_to_rport(dev);
put_device(dev->parent);
kfree(rport);
}
static int scsi_is_srp_rport(const struct device *dev)
{
return dev->release == srp_rport_release;
}
static int srp_rport_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct srp_internal *i;
if (!scsi_is_srp_rport(dev))
return 0;
shost = dev_to_shost(dev->parent);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
return 0;
i = to_srp_internal(shost->transportt);
return &i->rport_attr_cont.ac == cont;
}
static int srp_host_match(struct attribute_container *cont, struct device *dev)
{
struct Scsi_Host *shost;
struct srp_internal *i;
if (!scsi_is_host_device(dev))
return 0;
shost = dev_to_shost(dev);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
return 0;
i = to_srp_internal(shost->transportt);
return &i->t.host_attrs.ac == cont;
}
/**
* srp_rport_get() - increment rport reference count
* @rport: SRP target port.
*/
void srp_rport_get(struct srp_rport *rport)
{
get_device(&rport->dev);
}
EXPORT_SYMBOL(srp_rport_get);
/**
* srp_rport_put() - decrement rport reference count
* @rport: SRP target port.
*/
void srp_rport_put(struct srp_rport *rport)
{
put_device(&rport->dev);
}
EXPORT_SYMBOL(srp_rport_put);
/**
* srp_rport_add - add a SRP remote port to the device hierarchy
* @shost: scsi host the remote port is connected to.
* @ids: The port id for the remote port.
*
* Publishes a port to the rest of the system.
*/
struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
struct srp_rport_identifiers *ids)
{
struct srp_rport *rport;
struct device *parent = &shost->shost_gendev;
struct srp_internal *i = to_srp_internal(shost->transportt);
int id, ret;
rport = kzalloc(sizeof(*rport), GFP_KERNEL);
if (!rport)
return ERR_PTR(-ENOMEM);
mutex_init(&rport->mutex);
device_initialize(&rport->dev);
rport->dev.parent = get_device(parent);
rport->dev.release = srp_rport_release;
memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
rport->roles = ids->roles;
if (i->f->reconnect)
rport->reconnect_delay = i->f->reconnect_delay ?
*i->f->reconnect_delay : 10;
INIT_DELAYED_WORK(&rport->reconnect_work, srp_reconnect_work);
rport->fast_io_fail_tmo = i->f->fast_io_fail_tmo ?
*i->f->fast_io_fail_tmo : 15;
rport->dev_loss_tmo = i->f->dev_loss_tmo ? *i->f->dev_loss_tmo : 60;
INIT_DELAYED_WORK(&rport->fast_io_fail_work,
rport_fast_io_fail_timedout);
INIT_DELAYED_WORK(&rport->dev_loss_work, rport_dev_loss_timedout);
id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
dev_set_name(&rport->dev, "port-%d:%d", shost->host_no, id);
transport_setup_device(&rport->dev);
ret = device_add(&rport->dev);
if (ret) {
transport_destroy_device(&rport->dev);
put_device(&rport->dev);
return ERR_PTR(ret);
}
transport_add_device(&rport->dev);
transport_configure_device(&rport->dev);
return rport;
}
EXPORT_SYMBOL_GPL(srp_rport_add);
/**
* srp_rport_del - remove a SRP remote port
* @rport: SRP remote port to remove
*
* Removes the specified SRP remote port.
*/
void srp_rport_del(struct srp_rport *rport)
{
struct device *dev = &rport->dev;
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
put_device(dev);
}
EXPORT_SYMBOL_GPL(srp_rport_del);
static int do_srp_rport_del(struct device *dev, void *data)
{
if (scsi_is_srp_rport(dev))
srp_rport_del(dev_to_rport(dev));
return 0;
}
/**
* srp_remove_host - tear down a Scsi_Host's SRP data structures
* @shost: Scsi Host that is torn down
*
* Removes all SRP remote ports for a given Scsi_Host.
* Must be called just before scsi_remove_host for SRP HBAs.
*/
void srp_remove_host(struct Scsi_Host *shost)
{
device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
}
EXPORT_SYMBOL_GPL(srp_remove_host);
/**
* srp_stop_rport_timers - stop the transport layer recovery timers
* @rport: SRP remote port for which to stop the timers.
*
* Must be called after srp_remove_host() and scsi_remove_host(). The caller
* must hold a reference on the rport (rport->dev) and on the SCSI host
* (rport->dev.parent).
*/
void srp_stop_rport_timers(struct srp_rport *rport)
{
mutex_lock(&rport->mutex);
if (rport->state == SRP_RPORT_BLOCKED)
__rport_fail_io_fast(rport);
srp_rport_set_state(rport, SRP_RPORT_LOST);
mutex_unlock(&rport->mutex);
cancel_delayed_work_sync(&rport->reconnect_work);
cancel_delayed_work_sync(&rport->fast_io_fail_work);
cancel_delayed_work_sync(&rport->dev_loss_work);
}
EXPORT_SYMBOL_GPL(srp_stop_rport_timers);
/**
* srp_attach_transport - instantiate SRP transport template
* @ft: SRP transport class function template
*/
struct scsi_transport_template *
srp_attach_transport(struct srp_function_template *ft)
{
int count;
struct srp_internal *i;
i = kzalloc(sizeof(*i), GFP_KERNEL);
if (!i)
return NULL;
i->t.host_size = sizeof(struct srp_host_attrs);
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
i->t.host_attrs.ac.class = &srp_host_class.class;
i->t.host_attrs.ac.match = srp_host_match;
i->host_attrs[0] = NULL;
transport_container_register(&i->t.host_attrs);
i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
i->rport_attr_cont.ac.class = &srp_rport_class.class;
i->rport_attr_cont.ac.match = srp_rport_match;
count = 0;
i->rport_attrs[count++] = &dev_attr_port_id;
i->rport_attrs[count++] = &dev_attr_roles;
if (ft->has_rport_state) {
i->rport_attrs[count++] = &dev_attr_state;
i->rport_attrs[count++] = &dev_attr_fast_io_fail_tmo;
i->rport_attrs[count++] = &dev_attr_dev_loss_tmo;
}
if (ft->reconnect) {
i->rport_attrs[count++] = &dev_attr_reconnect_delay;
i->rport_attrs[count++] = &dev_attr_failed_reconnects;
}
if (ft->rport_delete)
i->rport_attrs[count++] = &dev_attr_delete;
i->rport_attrs[count++] = NULL;
BUG_ON(count > ARRAY_SIZE(i->rport_attrs));
transport_container_register(&i->rport_attr_cont);
i->f = ft;
return &i->t;
}
EXPORT_SYMBOL_GPL(srp_attach_transport);
/**
* srp_release_transport - release SRP transport template instance
* @t: transport template instance
*/
void srp_release_transport(struct scsi_transport_template *t)
{
struct srp_internal *i = to_srp_internal(t);
transport_container_unregister(&i->t.host_attrs);
transport_container_unregister(&i->rport_attr_cont);
kfree(i);
}
EXPORT_SYMBOL_GPL(srp_release_transport);
static __init int srp_transport_init(void)
{
int ret;
ret = transport_class_register(&srp_host_class);
if (ret)
return ret;
ret = transport_class_register(&srp_rport_class);
if (ret)
goto unregister_host_class;
return 0;
unregister_host_class:
transport_class_unregister(&srp_host_class);
return ret;
}
static void __exit srp_transport_exit(void)
{
transport_class_unregister(&srp_host_class);
transport_class_unregister(&srp_rport_class);
}
MODULE_AUTHOR("FUJITA Tomonori");
MODULE_DESCRIPTION("SRP Transport Attributes");
MODULE_LICENSE("GPL");
module_init(srp_transport_init);
module_exit(srp_transport_exit);