forked from luck/tmp_suning_uos_patched
669f044170
Additionally, rename srp_wait_for_queuecommand() into scsi_wait_for_queuecommand() and add a comment about the queuecommand() call from scsi_send_eh_cmnd(). Note: this patch changes scsi_internal_device_block from a function that did not sleep into a function that may sleep. This is fine for all callers of this function: * scsi_internal_device_block() is called from the mpt3sas device while that driver holds the ioc->dm_cmds.mutex. This means that the mpt3sas driver calls this function from thread context. * scsi_target_block() is called by __iscsi_block_session() from kernel thread context and with IRQs enabled. * The SRP transport code also calls scsi_target_block() from kernel thread context while sleeping is allowed. * The snic driver also calls scsi_target_block() from a context from which sleeping is allowed. The scsi_target_block() call namely occurs immediately after a scsi_flush_work() call. [mkp: s/shost/sdev/] Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Cc: James Bottomley <jejb@linux.vnet.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Doug Ledford <dledford@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
908 lines
25 KiB
C
908 lines
25 KiB
C
/*
|
|
* SCSI RDMA (SRP) transport class
|
|
*
|
|
* Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
|
|
*
|
|
* 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
|
|
*/
|
|
#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;
|
|
};
|
|
|
|
#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 inline struct srp_rport *shost_to_rport(struct Scsi_Host *shost)
|
|
{
|
|
return transport_class_to_srp_rport(&shost->shost_gendev);
|
|
}
|
|
|
|
/**
|
|
* 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, int 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.
|
|
*/
|
|
spin_lock_irq(shost->host_lock);
|
|
__shost_for_each_device(sdev, shost)
|
|
if (sdev->sdev_state == SDEV_OFFLINE)
|
|
sdev->sdev_state = SDEV_RUNNING;
|
|
spin_unlock_irq(shost->host_lock);
|
|
} 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_NOT_HANDLED).
|
|
*
|
|
* Note: This function is called from soft-IRQ context and with the request
|
|
* queue lock held.
|
|
*/
|
|
static 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->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_NOT_HANDLED;
|
|
}
|
|
|
|
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);
|
|
|
|
static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
|
|
int result)
|
|
{
|
|
struct srp_internal *i = to_srp_internal(shost->transportt);
|
|
return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
|
|
}
|
|
|
|
static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
|
|
{
|
|
struct srp_internal *i = to_srp_internal(shost->transportt);
|
|
return i->f->it_nexus_response(shost, nexus, result);
|
|
}
|
|
|
|
/**
|
|
* 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.eh_timed_out = srp_timed_out;
|
|
|
|
i->t.tsk_mgmt_response = srp_tsk_mgmt_response;
|
|
i->t.it_nexus_response = srp_it_nexus_response;
|
|
|
|
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);
|