[SCSI] FC transport: Add dev_loss_tmo callbacks, and new fast_io_fail_tmo w/ callback
This patch adds the following functionality to the FC transport: - dev_loss_tmo LLDD callback : Called to essentially confirm the deletion of an rport. Thus, it is called whenever the dev_loss_tmo fires, or when the rport is deleted due to other circumstances (module unload, etc). It is expected that the callback will initiate the termination of any outstanding i/o on the rport. - fast_io_fail_tmo and LLD callback: There are some cases where it may take a long while to truly determine device loss, but the system is in a multipathing configuration that if the i/o was failed quickly (faster than dev_loss_tmo), it could be redirected to a different path and completed sooner. Many thanks to Mike Reed who cleaned up the initial RFC in support of this post. The original RFC is at: http://marc.theaimsgroup.com/?l=linux-scsi&m=115505981027246&w=2 Signed-off-by: James Smart <James.Smart@emulex.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>wifi-calibration
James Smart
James Bottomley
parent
ae36764a23
commit
0f29b966d6
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@ -242,6 +242,7 @@ fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
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static void fc_timeout_deleted_rport(void *data);
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static void fc_timeout_fail_rport_io(void *data);
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static void fc_scsi_scan_rport(void *data);
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/*
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@ -249,7 +250,7 @@ static void fc_scsi_scan_rport(void *data);
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* Increase these values if you add attributes
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*/
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#define FC_STARGET_NUM_ATTRS 3
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#define FC_RPORT_NUM_ATTRS 9
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#define FC_RPORT_NUM_ATTRS 10
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#define FC_HOST_NUM_ATTRS 17
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struct fc_internal {
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@ -622,11 +623,14 @@ store_fc_rport_##field(struct class_device *cdev, const char *buf, \
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struct fc_rport *rport = transport_class_to_rport(cdev); \
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struct Scsi_Host *shost = rport_to_shost(rport); \
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struct fc_internal *i = to_fc_internal(shost->transportt); \
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char *cp; \
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if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
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(rport->port_state == FC_PORTSTATE_DELETED) || \
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(rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
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return -EBUSY; \
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val = simple_strtoul(buf, NULL, 0); \
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val = simple_strtoul(buf, &cp, 0); \
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if (*cp && (*cp != '\n')) \
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return -EINVAL; \
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i->f->set_rport_##field(rport, val); \
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return count; \
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}
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@ -708,6 +712,13 @@ static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO, \
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if (i->f->show_rport_##field) \
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count++
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#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
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{ \
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i->private_rport_attrs[count] = class_device_attr_rport_##field; \
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i->rport_attrs[count] = &i->private_rport_attrs[count]; \
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count++; \
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}
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/* The FC Transport Remote Port Attributes: */
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@ -740,12 +751,14 @@ store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
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struct fc_rport *rport = transport_class_to_rport(cdev);
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struct Scsi_Host *shost = rport_to_shost(rport);
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struct fc_internal *i = to_fc_internal(shost->transportt);
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char *cp;
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if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
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(rport->port_state == FC_PORTSTATE_DELETED) ||
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(rport->port_state == FC_PORTSTATE_NOTPRESENT))
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return -EBUSY;
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val = simple_strtoul(buf, NULL, 0);
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if ((val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
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val = simple_strtoul(buf, &cp, 0);
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if ((*cp && (*cp != '\n')) ||
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(val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
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return -EINVAL;
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i->f->set_rport_dev_loss_tmo(rport, val);
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return count;
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@ -795,6 +808,44 @@ static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
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fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
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fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
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/*
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* fast_io_fail_tmo attribute
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*/
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static ssize_t
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show_fc_rport_fast_io_fail_tmo (struct class_device *cdev, char *buf)
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{
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struct fc_rport *rport = transport_class_to_rport(cdev);
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if (rport->fast_io_fail_tmo == -1)
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return snprintf(buf, 5, "off\n");
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return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
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}
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static ssize_t
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store_fc_rport_fast_io_fail_tmo(struct class_device *cdev, const char *buf,
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size_t count)
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{
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int val;
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char *cp;
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struct fc_rport *rport = transport_class_to_rport(cdev);
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if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
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(rport->port_state == FC_PORTSTATE_DELETED) ||
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(rport->port_state == FC_PORTSTATE_NOTPRESENT))
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return -EBUSY;
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if (strncmp(buf, "off", 3) == 0)
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rport->fast_io_fail_tmo = -1;
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else {
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val = simple_strtoul(buf, &cp, 0);
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if ((*cp && (*cp != '\n')) ||
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(val < 0) || (val >= rport->dev_loss_tmo))
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return -EINVAL;
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rport->fast_io_fail_tmo = val;
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}
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return count;
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}
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static FC_CLASS_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
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show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
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/*
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@ -880,8 +931,11 @@ store_fc_host_##field(struct class_device *cdev, const char *buf, \
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int val; \
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struct Scsi_Host *shost = transport_class_to_shost(cdev); \
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struct fc_internal *i = to_fc_internal(shost->transportt); \
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char *cp; \
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\
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val = simple_strtoul(buf, NULL, 0); \
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val = simple_strtoul(buf, &cp, 0); \
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if (*cp && (*cp != '\n')) \
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return -EINVAL; \
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i->f->set_host_##field(shost, val); \
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return count; \
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}
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@ -1481,6 +1535,8 @@ fc_attach_transport(struct fc_function_template *ft)
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SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
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SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
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SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
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if (ft->terminate_rport_io)
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SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
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BUG_ON(count > FC_RPORT_NUM_ATTRS);
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@ -1552,7 +1608,7 @@ fc_flush_work(struct Scsi_Host *shost)
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* @delay: jiffies to delay the work queuing
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*
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* Return value:
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* 0 on success / != 0 for error
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* 1 on success / 0 already queued / < 0 for error
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**/
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static int
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fc_queue_devloss_work(struct Scsi_Host *shost, struct work_struct *work,
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@ -1567,6 +1623,9 @@ fc_queue_devloss_work(struct Scsi_Host *shost, struct work_struct *work,
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return -EINVAL;
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}
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if (delay == 0)
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return queue_work(fc_host_devloss_work_q(shost), work);
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return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
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}
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@ -1659,10 +1718,23 @@ fc_starget_delete(void *data)
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struct fc_rport *rport = (struct fc_rport *)data;
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struct Scsi_Host *shost = rport_to_shost(rport);
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unsigned long flags;
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struct fc_internal *i = to_fc_internal(shost->transportt);
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/*
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* Involve the LLDD if possible. All io on the rport is to
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* be terminated, either as part of the dev_loss_tmo callback
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* processing, or via the terminate_rport_io function.
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*/
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if (i->f->dev_loss_tmo_callbk)
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i->f->dev_loss_tmo_callbk(rport);
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else if (i->f->terminate_rport_io)
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i->f->terminate_rport_io(rport);
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spin_lock_irqsave(shost->host_lock, flags);
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if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
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spin_unlock_irqrestore(shost->host_lock, flags);
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if (!cancel_delayed_work(&rport->fail_io_work))
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fc_flush_devloss(shost);
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if (!cancel_delayed_work(&rport->dev_loss_work))
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fc_flush_devloss(shost);
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spin_lock_irqsave(shost->host_lock, flags);
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@ -1685,10 +1757,7 @@ fc_rport_final_delete(void *data)
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struct fc_rport *rport = (struct fc_rport *)data;
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struct device *dev = &rport->dev;
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struct Scsi_Host *shost = rport_to_shost(rport);
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/* Delete SCSI target and sdevs */
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if (rport->scsi_target_id != -1)
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fc_starget_delete(data);
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struct fc_internal *i = to_fc_internal(shost->transportt);
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/*
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* if a scan is pending, flush the SCSI Host work_q so that
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@ -1697,6 +1766,14 @@ fc_rport_final_delete(void *data)
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if (rport->flags & FC_RPORT_SCAN_PENDING)
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scsi_flush_work(shost);
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/* Delete SCSI target and sdevs */
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if (rport->scsi_target_id != -1)
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fc_starget_delete(data);
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else if (i->f->dev_loss_tmo_callbk)
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i->f->dev_loss_tmo_callbk(rport);
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else if (i->f->terminate_rport_io)
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i->f->terminate_rport_io(rport);
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transport_remove_device(dev);
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device_del(dev);
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transport_destroy_device(dev);
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@ -1748,8 +1825,10 @@ fc_rport_create(struct Scsi_Host *shost, int channel,
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if (fci->f->dd_fcrport_size)
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rport->dd_data = &rport[1];
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rport->channel = channel;
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rport->fast_io_fail_tmo = -1;
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INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport);
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INIT_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io, rport);
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INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
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INIT_WORK(&rport->stgt_delete_work, fc_starget_delete, rport);
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INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete, rport);
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@ -1913,11 +1992,13 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel,
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/* restart the target */
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/*
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* Stop the target timer first. Take no action
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* Stop the target timers first. Take no action
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* on the del_timer failure as the state
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* machine state change will validate the
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* transaction.
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*/
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if (!cancel_delayed_work(&rport->fail_io_work))
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fc_flush_devloss(shost);
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if (!cancel_delayed_work(work))
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fc_flush_devloss(shost);
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@ -2061,6 +2142,7 @@ void
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fc_remote_port_delete(struct fc_rport *rport)
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{
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struct Scsi_Host *shost = rport_to_shost(rport);
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struct fc_internal *i = to_fc_internal(shost->transportt);
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int timeout = rport->dev_loss_tmo;
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unsigned long flags;
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@ -2091,6 +2173,12 @@ fc_remote_port_delete(struct fc_rport *rport)
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scsi_target_block(&rport->dev);
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/* see if we need to kill io faster than waiting for device loss */
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if ((rport->fast_io_fail_tmo != -1) &&
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(rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
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fc_queue_devloss_work(shost, &rport->fail_io_work,
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rport->fast_io_fail_tmo * HZ);
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/* cap the length the devices can be blocked until they are deleted */
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fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
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}
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@ -2150,6 +2238,8 @@ fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
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* machine state change will validate the
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* transaction.
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*/
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if (!cancel_delayed_work(&rport->fail_io_work))
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fc_flush_devloss(shost);
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if (!cancel_delayed_work(&rport->dev_loss_work))
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fc_flush_devloss(shost);
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@ -2270,6 +2360,28 @@ fc_timeout_deleted_rport(void *data)
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fc_queue_work(shost, &rport->stgt_delete_work);
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}
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/**
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* fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a
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* disconnected SCSI target.
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*
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* @data: rport to terminate io on.
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*
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* Notes: Only requests the failure of the io, not that all are flushed
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* prior to returning.
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**/
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static void
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fc_timeout_fail_rport_io(void *data)
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{
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struct fc_rport *rport = (struct fc_rport *)data;
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struct Scsi_Host *shost = rport_to_shost(rport);
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struct fc_internal *i = to_fc_internal(shost->transportt);
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if (rport->port_state != FC_PORTSTATE_BLOCKED)
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return;
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i->f->terminate_rport_io(rport);
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}
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/**
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* fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
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*
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@ -195,6 +195,7 @@ struct fc_rport { /* aka fc_starget_attrs */
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u32 roles;
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enum fc_port_state port_state; /* Will only be ONLINE or UNKNOWN */
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u32 scsi_target_id;
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u32 fast_io_fail_tmo;
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/* exported data */
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void *dd_data; /* Used for driver-specific storage */
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@ -207,6 +208,7 @@ struct fc_rport { /* aka fc_starget_attrs */
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struct device dev;
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struct work_struct dev_loss_work;
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struct work_struct scan_work;
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struct work_struct fail_io_work;
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struct work_struct stgt_delete_work;
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struct work_struct rport_delete_work;
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} __attribute__((aligned(sizeof(unsigned long))));
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@ -445,6 +447,9 @@ struct fc_function_template {
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int (*issue_fc_host_lip)(struct Scsi_Host *);
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void (*dev_loss_tmo_callbk)(struct fc_rport *);
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void (*terminate_rport_io)(struct fc_rport *);
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/* allocation lengths for host-specific data */
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u32 dd_fcrport_size;
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