#include <linux/netlink.h>
#include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
+#include <scsi/scsi_bsg_fc.h>
#include "scsi_priv.h"
#include "scsi_transport_fc_internal.h"
static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
static void fc_vport_sched_delete(struct work_struct *work);
-
-/*
- * This is a temporary carrier for creating a vport. It will eventually
- * be replaced by a real message definition for sgio or netlink.
- *
- * fc_vport_identifiers: This set of data contains all elements
- * to uniquely identify and instantiate a FC virtual port.
- *
- * Notes:
- * symbolic_name: The driver is to append the symbolic_name string data
- * to the symbolic_node_name data that it generates by default.
- * the resulting combination should then be registered with the switch.
- * It is expected that things like Xen may stuff a VM title into
- * this field.
- */
-struct fc_vport_identifiers {
- u64 node_name;
- u64 port_name;
- u32 roles;
- bool disable;
- enum fc_port_type vport_type; /* only FC_PORTTYPE_NPIV allowed */
- char symbolic_name[FC_VPORT_SYMBOLIC_NAMELEN];
-};
-
-static int fc_vport_create(struct Scsi_Host *shost, int channel,
+static int fc_vport_setup(struct Scsi_Host *shost, int channel,
struct device *pdev, struct fc_vport_identifiers *ids,
struct fc_vport **vport);
+static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
+static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
+static void fc_bsg_remove(struct request_queue *);
+static void fc_bsg_goose_queue(struct fc_rport *);
/*
* Redefine so that we can have same named attributes in the
{ FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
{ FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
{ FC_PORTTYPE_LPORT, "LPort (private loop)" },
- { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection" },
+ { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
{ FC_PORTTYPE_NPIV, "NPIV VPORT" },
};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_STARGET_NUM_ATTRS 3
#define FC_RPORT_NUM_ATTRS 10
#define FC_VPORT_NUM_ATTRS 9
-#define FC_HOST_NUM_ATTRS 21
+#define FC_HOST_NUM_ATTRS 22
struct fc_internal {
struct scsi_transport_template t;
return -ENOMEM;
}
+ fc_bsg_hostadd(shost, fc_host);
+ /* ignore any bsg add error - we just can't do sgio */
+
+ return 0;
+}
+
+static int fc_host_remove(struct transport_container *tc, struct device *dev,
+ struct device *cdev)
+{
+ struct Scsi_Host *shost = dev_to_shost(dev);
+ struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
+
+ fc_bsg_remove(fc_host->rqst_q);
return 0;
}
static DECLARE_TRANSPORT_CLASS(fc_host_class,
"fc_host",
fc_host_setup,
- NULL,
+ fc_host_remove,
NULL);
/*
event->event_code = event_code;
event->event_data = event_data;
- err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
- GFP_KERNEL);
- if (err && (err != -ESRCH)) /* filter no recipient errors */
- /* nlmsg_multicast already kfree_skb'd */
- goto send_fail;
-
+ nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
+ GFP_KERNEL);
return;
send_fail_skb:
name = get_fc_host_event_code_name(event_code);
printk(KERN_WARNING
"%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
- __FUNCTION__, shost->host_no,
+ __func__, shost->host_no,
(name) ? name : "<unknown>", event_data, err);
return;
}
event->event_code = FCH_EVT_VENDOR_UNIQUE;
memcpy(&event->event_data, data_buf, data_len);
- err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
- GFP_KERNEL);
- if (err && (err != -ESRCH)) /* filter no recipient errors */
- /* nlmsg_multicast already kfree_skb'd */
- goto send_vendor_fail;
-
+ nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
+ GFP_KERNEL);
return;
send_vendor_fail_skb:
send_vendor_fail:
printk(KERN_WARNING
"%s: Dropped Event : host %d vendor_unique - err %d\n",
- __FUNCTION__, shost->host_no, err);
+ __func__, shost->host_no, err);
return;
}
EXPORT_SYMBOL(fc_host_post_vendor_event);
vid.disable = false; /* always enabled */
/* we only allow support on Channel 0 !!! */
- stat = fc_vport_create(shost, 0, &shost->shost_gendev, &vid, &vport);
+ stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
return stat ? stat : count;
}
static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
* Notes:
* This routine assumes no locks are held on entry.
*/
-static enum scsi_eh_timer_return
+static enum blk_eh_timer_return
fc_timed_out(struct scsi_cmnd *scmd)
{
struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
if (rport->port_state == FC_PORTSTATE_BLOCKED)
- return EH_RESET_TIMER;
+ return BLK_EH_RESET_TIMER;
- return EH_NOT_HANDLED;
+ return BLK_EH_NOT_HANDLED;
}
/*
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
- if (ft->terminate_rport_io)
- SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
+ SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
BUG_ON(count > FC_RPORT_NUM_ATTRS);
}
EXPORT_SYMBOL(fc_remove_host);
+static void fc_terminate_rport_io(struct fc_rport *rport)
+{
+ struct Scsi_Host *shost = rport_to_shost(rport);
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+
+ /* Involve the LLDD if possible to terminate all io on the rport. */
+ if (i->f->terminate_rport_io)
+ i->f->terminate_rport_io(rport);
+
+ /*
+ * must unblock to flush queued IO. The caller will have set
+ * the port_state or flags, so that fc_remote_port_chkready will
+ * fail IO.
+ */
+ scsi_target_unblock(&rport->dev);
+}
/**
* fc_starget_delete - called to delete the scsi decendents of an rport
{
struct fc_rport *rport =
container_of(work, struct fc_rport, stgt_delete_work);
- struct Scsi_Host *shost = rport_to_shost(rport);
- struct fc_internal *i = to_fc_internal(shost->transportt);
-
- /* Involve the LLDD if possible to terminate all io on the rport. */
- if (i->f->terminate_rport_io)
- i->f->terminate_rport_io(rport);
+ fc_terminate_rport_io(rport);
scsi_remove_target(&rport->dev);
}
if (rport->flags & FC_RPORT_SCAN_PENDING)
scsi_flush_work(shost);
- /* involve the LLDD to terminate all pending i/o */
- if (i->f->terminate_rport_io)
- i->f->terminate_rport_io(rport);
+ fc_terminate_rport_io(rport);
/*
* Cancel any outstanding timers. These should really exist
/*
* Notify the driver that the rport is now dead. The LLDD will
* also guarantee that any communication to the rport is terminated
+ *
+ * Avoid this call if we already called it when we preserved the
+ * rport for the binding.
*/
- if (i->f->dev_loss_tmo_callbk)
+ if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
+ (i->f->dev_loss_tmo_callbk))
i->f->dev_loss_tmo_callbk(rport);
+ fc_bsg_remove(rport->rqst_q);
+
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
rport = kzalloc(size, GFP_KERNEL);
if (unlikely(!rport)) {
- printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
+ printk(KERN_ERR "%s: allocation failure\n", __func__);
return NULL;
}
device_initialize(dev); /* takes self reference */
dev->parent = get_device(&shost->shost_gendev); /* parent reference */
dev->release = fc_rport_dev_release;
- sprintf(dev->bus_id, "rport-%d:%d-%d",
- shost->host_no, channel, rport->number);
+ dev_set_name(dev, "rport-%d:%d-%d",
+ shost->host_no, channel, rport->number);
transport_setup_device(dev);
error = device_add(dev);
transport_add_device(dev);
transport_configure_device(dev);
+ fc_bsg_rportadd(shost, rport);
+ /* ignore any bsg add error - we just can't do sgio */
+
if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
/* initiate a scan of the target */
rport->flags |= FC_RPORT_SCAN_PENDING;
spin_lock_irqsave(shost->host_lock, flags);
- rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
+ rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
+ FC_RPORT_DEVLOSS_PENDING |
+ FC_RPORT_DEVLOSS_CALLBK_DONE);
/* if target, initiate a scan */
if (rport->scsi_target_id != -1) {
spin_unlock_irqrestore(shost->host_lock,
flags);
+ fc_bsg_goose_queue(rport);
+
return rport;
}
}
rport->port_id = ids->port_id;
rport->roles = ids->roles;
rport->port_state = FC_PORTSTATE_ONLINE;
+ rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
if (fci->f->dd_fcrport_size)
memset(rport->dd_data, 0,
fc_remote_port_delete(struct fc_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
- struct fc_internal *i = to_fc_internal(shost->transportt);
int timeout = rport->dev_loss_tmo;
unsigned long flags;
/* see if we need to kill io faster than waiting for device loss */
if ((rport->fast_io_fail_tmo != -1) &&
- (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
+ (rport->fast_io_fail_tmo < timeout))
fc_queue_devloss_work(shost, &rport->fail_io_work,
rport->fast_io_fail_tmo * HZ);
fc_flush_devloss(shost);
spin_lock_irqsave(shost->host_lock, flags);
- rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
+ rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
+ FC_RPORT_DEVLOSS_PENDING);
spin_unlock_irqrestore(shost->host_lock, flags);
/* ensure any stgt delete functions are done */
struct fc_rport *rport =
container_of(work, struct fc_rport, dev_loss_work.work);
struct Scsi_Host *shost = rport_to_shost(rport);
+ struct fc_internal *i = to_fc_internal(shost->transportt);
struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
unsigned long flags;
rport->supported_classes = FC_COS_UNSPECIFIED;
rport->roles = FC_PORT_ROLE_UNKNOWN;
rport->port_state = FC_PORTSTATE_NOTPRESENT;
+ rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
+ rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
+
+ /*
+ * Pre-emptively kill I/O rather than waiting for the work queue
+ * item to teardown the starget. (FCOE libFC folks prefer this
+ * and to have the rport_port_id still set when it's done).
+ */
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ fc_terminate_rport_io(rport);
+
+ BUG_ON(rport->port_state != FC_PORTSTATE_NOTPRESENT);
/* remove the identifiers that aren't used in the consisting binding */
switch (fc_host->tgtid_bind_type) {
* went away and didn't come back - we'll remove
* all attached scsi devices.
*/
- spin_unlock_irqrestore(shost->host_lock, flags);
-
- scsi_target_unblock(&rport->dev);
fc_queue_work(shost, &rport->stgt_delete_work);
+
+ /*
+ * Notify the driver that the rport is now dead. The LLDD will
+ * also guarantee that any communication to the rport is terminated
+ *
+ * Note: we set the CALLBK_DONE flag above to correspond
+ */
+ if (i->f->dev_loss_tmo_callbk)
+ i->f->dev_loss_tmo_callbk(rport);
}
+
/**
* fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
* @work: rport to terminate io on.
{
struct fc_rport *rport =
container_of(work, struct fc_rport, fail_io_work.work);
- struct Scsi_Host *shost = rport_to_shost(rport);
- struct fc_internal *i = to_fc_internal(shost->transportt);
if (rport->port_state != FC_PORTSTATE_BLOCKED)
return;
- i->f->terminate_rport_io(rport);
+ rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
+ fc_terminate_rport_io(rport);
}
/**
/**
- * fc_vport_create - allocates and creates a FC virtual port.
+ * fc_vport_setup - allocates and creates a FC virtual port.
* @shost: scsi host the virtual port is connected to.
* @channel: Channel on shost port connected to.
* @pdev: parent device for vport
* This routine assumes no locks are held on entry.
*/
static int
-fc_vport_create(struct Scsi_Host *shost, int channel, struct device *pdev,
+fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
{
struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
vport = kzalloc(size, GFP_KERNEL);
if (unlikely(!vport)) {
- printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
+ printk(KERN_ERR "%s: allocation failure\n", __func__);
return -ENOMEM;
}
device_initialize(dev); /* takes self reference */
dev->parent = get_device(pdev); /* takes parent reference */
dev->release = fc_vport_dev_release;
- sprintf(dev->bus_id, "vport-%d:%d-%d",
- shost->host_no, channel, vport->number);
+ dev_set_name(dev, "vport-%d:%d-%d",
+ shost->host_no, channel, vport->number);
transport_setup_device(dev);
error = device_add(dev);
*/
if (pdev != &shost->shost_gendev) {
error = sysfs_create_link(&shost->shost_gendev.kobj,
- &dev->kobj, dev->bus_id);
+ &dev->kobj, dev_name(dev));
if (error)
printk(KERN_ERR
"%s: Cannot create vport symlinks for "
"%s, err=%d\n",
- __FUNCTION__, dev->bus_id, error);
+ __func__, dev_name(dev), error);
}
spin_lock_irqsave(shost->host_lock, flags);
vport->flags &= ~FC_VPORT_CREATING;
spin_unlock_irqrestore(shost->host_lock, flags);
dev_printk(KERN_NOTICE, pdev,
- "%s created via shost%d channel %d\n", dev->bus_id,
+ "%s created via shost%d channel %d\n", dev_name(dev),
shost->host_no, channel);
*ret_vport = vport;
return error;
}
+/**
+ * fc_vport_create - Admin App or LLDD requests creation of a vport
+ * @shost: scsi host the virtual port is connected to.
+ * @channel: channel on shost port connected to.
+ * @ids: The world wide names, FC4 port roles, etc for
+ * the virtual port.
+ *
+ * Notes:
+ * This routine assumes no locks are held on entry.
+ */
+struct fc_vport *
+fc_vport_create(struct Scsi_Host *shost, int channel,
+ struct fc_vport_identifiers *ids)
+{
+ int stat;
+ struct fc_vport *vport;
+
+ stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
+ ids, &vport);
+ return stat ? NULL : vport;
+}
+EXPORT_SYMBOL(fc_vport_create);
/**
* fc_vport_terminate - Admin App or LLDD requests termination of a vport
return stat;
if (dev->parent != &shost->shost_gendev)
- sysfs_remove_link(&shost->shost_gendev.kobj, dev->bus_id);
+ sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
if (stat)
dev_printk(KERN_ERR, vport->dev.parent,
"%s: %s could not be deleted created via "
- "shost%d channel %d - error %d\n", __FUNCTION__,
- vport->dev.bus_id, vport->shost->host_no,
+ "shost%d channel %d - error %d\n", __func__,
+ dev_name(&vport->dev), vport->shost->host_no,
vport->channel, stat);
}
+/*
+ * BSG support
+ */
+
+
+/**
+ * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
+ * @job: fc_bsg_job that is to be torn down
+ */
+static void
+fc_destroy_bsgjob(struct fc_bsg_job *job)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&job->job_lock, flags);
+ if (job->ref_cnt) {
+ spin_unlock_irqrestore(&job->job_lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&job->job_lock, flags);
+
+ put_device(job->dev); /* release reference for the request */
+
+ kfree(job->request_payload.sg_list);
+ kfree(job->reply_payload.sg_list);
+ kfree(job);
+}
+
+/**
+ * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
+ * completed
+ * @job: fc_bsg_job that is complete
+ */
+static void
+fc_bsg_jobdone(struct fc_bsg_job *job)
+{
+ struct request *req = job->req;
+ struct request *rsp = req->next_rq;
+ int err;
+
+ err = job->req->errors = job->reply->result;
+
+ if (err < 0)
+ /* we're only returning the result field in the reply */
+ job->req->sense_len = sizeof(uint32_t);
+ else
+ job->req->sense_len = job->reply_len;
+
+ /* we assume all request payload was transferred, residual == 0 */
+ req->resid_len = 0;
+
+ if (rsp) {
+ WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
+
+ /* set reply (bidi) residual */
+ rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
+ rsp->resid_len);
+ }
+ blk_complete_request(req);
+}
+
+/**
+ * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
+ * @rq: BSG request that holds the job to be destroyed
+ */
+static void fc_bsg_softirq_done(struct request *rq)
+{
+ struct fc_bsg_job *job = rq->special;
+ unsigned long flags;
+
+ spin_lock_irqsave(&job->job_lock, flags);
+ job->state_flags |= FC_RQST_STATE_DONE;
+ job->ref_cnt--;
+ spin_unlock_irqrestore(&job->job_lock, flags);
+
+ blk_end_request_all(rq, rq->errors);
+ fc_destroy_bsgjob(job);
+}
+
+/**
+ * fc_bsg_job_timeout - handler for when a bsg request timesout
+ * @req: request that timed out
+ */
+static enum blk_eh_timer_return
+fc_bsg_job_timeout(struct request *req)
+{
+ struct fc_bsg_job *job = (void *) req->special;
+ struct Scsi_Host *shost = job->shost;
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+ unsigned long flags;
+ int err = 0, done = 0;
+
+ if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
+ return BLK_EH_RESET_TIMER;
+
+ spin_lock_irqsave(&job->job_lock, flags);
+ if (job->state_flags & FC_RQST_STATE_DONE)
+ done = 1;
+ else
+ job->ref_cnt++;
+ spin_unlock_irqrestore(&job->job_lock, flags);
+
+ if (!done && i->f->bsg_timeout) {
+ /* call LLDD to abort the i/o as it has timed out */
+ err = i->f->bsg_timeout(job);
+ if (err)
+ printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
+ "abort failed with status %d\n", err);
+ }
+
+ /* the blk_end_sync_io() doesn't check the error */
+ if (done)
+ return BLK_EH_NOT_HANDLED;
+ else
+ return BLK_EH_HANDLED;
+}
+
+static int
+fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
+{
+ size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
+
+ BUG_ON(!req->nr_phys_segments);
+
+ buf->sg_list = kzalloc(sz, GFP_KERNEL);
+ if (!buf->sg_list)
+ return -ENOMEM;
+ sg_init_table(buf->sg_list, req->nr_phys_segments);
+ buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
+ buf->payload_len = blk_rq_bytes(req);
+ return 0;
+}
+
+
+/**
+ * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
+ * bsg request
+ * @shost: SCSI Host corresponding to the bsg object
+ * @rport: (optional) FC Remote Port corresponding to the bsg object
+ * @req: BSG request that needs a job structure
+ */
+static int
+fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
+ struct request *req)
+{
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+ struct request *rsp = req->next_rq;
+ struct fc_bsg_job *job;
+ int ret;
+
+ BUG_ON(req->special);
+
+ job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
+ GFP_KERNEL);
+ if (!job)
+ return -ENOMEM;
+
+ /*
+ * Note: this is a bit silly.
+ * The request gets formatted as a SGIO v4 ioctl request, which
+ * then gets reformatted as a blk request, which then gets
+ * reformatted as a fc bsg request. And on completion, we have
+ * to wrap return results such that SGIO v4 thinks it was a scsi
+ * status. I hope this was all worth it.
+ */
+
+ req->special = job;
+ job->shost = shost;
+ job->rport = rport;
+ job->req = req;
+ if (i->f->dd_bsg_size)
+ job->dd_data = (void *)&job[1];
+ spin_lock_init(&job->job_lock);
+ job->request = (struct fc_bsg_request *)req->cmd;
+ job->request_len = req->cmd_len;
+ job->reply = req->sense;
+ job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
+ * allocated */
+ if (req->bio) {
+ ret = fc_bsg_map_buffer(&job->request_payload, req);
+ if (ret)
+ goto failjob_rls_job;
+ }
+ if (rsp && rsp->bio) {
+ ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
+ if (ret)
+ goto failjob_rls_rqst_payload;
+ }
+ job->job_done = fc_bsg_jobdone;
+ if (rport)
+ job->dev = &rport->dev;
+ else
+ job->dev = &shost->shost_gendev;
+ get_device(job->dev); /* take a reference for the request */
+
+ job->ref_cnt = 1;
+
+ return 0;
+
+
+failjob_rls_rqst_payload:
+ kfree(job->request_payload.sg_list);
+failjob_rls_job:
+ kfree(job);
+ return -ENOMEM;
+}
+
+
+enum fc_dispatch_result {
+ FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
+ FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
+ FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
+};
+
+
+/**
+ * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
+ * @q: fc host request queue
+ * @shost: scsi host rport attached to
+ * @job: bsg job to be processed
+ */
+static enum fc_dispatch_result
+fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
+ struct fc_bsg_job *job)
+{
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+ int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
+ int ret;
+
+ /* Validate the host command */
+ switch (job->request->msgcode) {
+ case FC_BSG_HST_ADD_RPORT:
+ cmdlen += sizeof(struct fc_bsg_host_add_rport);
+ break;
+
+ case FC_BSG_HST_DEL_RPORT:
+ cmdlen += sizeof(struct fc_bsg_host_del_rport);
+ break;
+
+ case FC_BSG_HST_ELS_NOLOGIN:
+ cmdlen += sizeof(struct fc_bsg_host_els);
+ /* there better be a xmt and rcv payloads */
+ if ((!job->request_payload.payload_len) ||
+ (!job->reply_payload.payload_len)) {
+ ret = -EINVAL;
+ goto fail_host_msg;
+ }
+ break;
+
+ case FC_BSG_HST_CT:
+ cmdlen += sizeof(struct fc_bsg_host_ct);
+ /* there better be xmt and rcv payloads */
+ if ((!job->request_payload.payload_len) ||
+ (!job->reply_payload.payload_len)) {
+ ret = -EINVAL;
+ goto fail_host_msg;
+ }
+ break;
+
+ case FC_BSG_HST_VENDOR:
+ cmdlen += sizeof(struct fc_bsg_host_vendor);
+ if ((shost->hostt->vendor_id == 0L) ||
+ (job->request->rqst_data.h_vendor.vendor_id !=
+ shost->hostt->vendor_id)) {
+ ret = -ESRCH;
+ goto fail_host_msg;
+ }
+ break;
+
+ default:
+ ret = -EBADR;
+ goto fail_host_msg;
+ }
+
+ /* check if we really have all the request data needed */
+ if (job->request_len < cmdlen) {
+ ret = -ENOMSG;
+ goto fail_host_msg;
+ }
+
+ ret = i->f->bsg_request(job);
+ if (!ret)
+ return FC_DISPATCH_UNLOCKED;
+
+fail_host_msg:
+ /* return the errno failure code as the only status */
+ BUG_ON(job->reply_len < sizeof(uint32_t));
+ job->reply->result = ret;
+ job->reply_len = sizeof(uint32_t);
+ fc_bsg_jobdone(job);
+ return FC_DISPATCH_UNLOCKED;
+}
+
+
+/*
+ * fc_bsg_goose_queue - restart rport queue in case it was stopped
+ * @rport: rport to be restarted
+ */
+static void
+fc_bsg_goose_queue(struct fc_rport *rport)
+{
+ int flagset;
+ unsigned long flags;
+
+ if (!rport->rqst_q)
+ return;
+
+ get_device(&rport->dev);
+
+ spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
+ flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
+ !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
+ if (flagset)
+ queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
+ __blk_run_queue(rport->rqst_q);
+ if (flagset)
+ queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
+ spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
+
+ put_device(&rport->dev);
+}
+
+
+/**
+ * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
+ * @q: rport request queue
+ * @shost: scsi host rport attached to
+ * @rport: rport request destined to
+ * @job: bsg job to be processed
+ */
+static enum fc_dispatch_result
+fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
+ struct fc_rport *rport, struct fc_bsg_job *job)
+{
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+ int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
+ int ret;
+
+ /* Validate the rport command */
+ switch (job->request->msgcode) {
+ case FC_BSG_RPT_ELS:
+ cmdlen += sizeof(struct fc_bsg_rport_els);
+ goto check_bidi;
+
+ case FC_BSG_RPT_CT:
+ cmdlen += sizeof(struct fc_bsg_rport_ct);
+check_bidi:
+ /* there better be xmt and rcv payloads */
+ if ((!job->request_payload.payload_len) ||
+ (!job->reply_payload.payload_len)) {
+ ret = -EINVAL;
+ goto fail_rport_msg;
+ }
+ break;
+ default:
+ ret = -EBADR;
+ goto fail_rport_msg;
+ }
+
+ /* check if we really have all the request data needed */
+ if (job->request_len < cmdlen) {
+ ret = -ENOMSG;
+ goto fail_rport_msg;
+ }
+
+ ret = i->f->bsg_request(job);
+ if (!ret)
+ return FC_DISPATCH_UNLOCKED;
+
+fail_rport_msg:
+ /* return the errno failure code as the only status */
+ BUG_ON(job->reply_len < sizeof(uint32_t));
+ job->reply->result = ret;
+ job->reply_len = sizeof(uint32_t);
+ fc_bsg_jobdone(job);
+ return FC_DISPATCH_UNLOCKED;
+}
+
+
+/**
+ * fc_bsg_request_handler - generic handler for bsg requests
+ * @q: request queue to manage
+ * @shost: Scsi_Host related to the bsg object
+ * @rport: FC remote port related to the bsg object (optional)
+ * @dev: device structure for bsg object
+ */
+static void
+fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
+ struct fc_rport *rport, struct device *dev)
+{
+ struct request *req;
+ struct fc_bsg_job *job;
+ enum fc_dispatch_result ret;
+
+ if (!get_device(dev))
+ return;
+
+ while (!blk_queue_plugged(q)) {
+ if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED))
+ break;
+
+ req = blk_fetch_request(q);
+ if (!req)
+ break;
+
+ if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
+ req->errors = -ENXIO;
+ spin_unlock_irq(q->queue_lock);
+ blk_end_request(req, -ENXIO, blk_rq_bytes(req));
+ spin_lock_irq(q->queue_lock);
+ continue;
+ }
+
+ spin_unlock_irq(q->queue_lock);
+
+ ret = fc_req_to_bsgjob(shost, rport, req);
+ if (ret) {
+ req->errors = ret;
+ blk_end_request(req, ret, blk_rq_bytes(req));
+ spin_lock_irq(q->queue_lock);
+ continue;
+ }
+
+ job = req->special;
+
+ /* check if we have the msgcode value at least */
+ if (job->request_len < sizeof(uint32_t)) {
+ BUG_ON(job->reply_len < sizeof(uint32_t));
+ job->reply->result = -ENOMSG;
+ job->reply_len = sizeof(uint32_t);
+ fc_bsg_jobdone(job);
+ spin_lock_irq(q->queue_lock);
+ continue;
+ }
+
+ /* the dispatch routines will unlock the queue_lock */
+ if (rport)
+ ret = fc_bsg_rport_dispatch(q, shost, rport, job);
+ else
+ ret = fc_bsg_host_dispatch(q, shost, job);
+
+ /* did dispatcher hit state that can't process any more */
+ if (ret == FC_DISPATCH_BREAK)
+ break;
+
+ /* did dispatcher had released the lock */
+ if (ret == FC_DISPATCH_UNLOCKED)
+ spin_lock_irq(q->queue_lock);
+ }
+
+ spin_unlock_irq(q->queue_lock);
+ put_device(dev);
+ spin_lock_irq(q->queue_lock);
+}
+
+
+/**
+ * fc_bsg_host_handler - handler for bsg requests for a fc host
+ * @q: fc host request queue
+ */
+static void
+fc_bsg_host_handler(struct request_queue *q)
+{
+ struct Scsi_Host *shost = q->queuedata;
+
+ fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
+}
+
+
+/**
+ * fc_bsg_rport_handler - handler for bsg requests for a fc rport
+ * @q: rport request queue
+ */
+static void
+fc_bsg_rport_handler(struct request_queue *q)
+{
+ struct fc_rport *rport = q->queuedata;
+ struct Scsi_Host *shost = rport_to_shost(rport);
+
+ fc_bsg_request_handler(q, shost, rport, &rport->dev);
+}
+
+
+/**
+ * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
+ * @shost: shost for fc_host
+ * @fc_host: fc_host adding the structures to
+ */
+static int
+fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
+{
+ struct device *dev = &shost->shost_gendev;
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+ struct request_queue *q;
+ int err;
+ char bsg_name[20];
+
+ fc_host->rqst_q = NULL;
+
+ if (!i->f->bsg_request)
+ return -ENOTSUPP;
+
+ snprintf(bsg_name, sizeof(bsg_name),
+ "fc_host%d", shost->host_no);
+
+ q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
+ if (!q) {
+ printk(KERN_ERR "fc_host%d: bsg interface failed to "
+ "initialize - no request queue\n",
+ shost->host_no);
+ return -ENOMEM;
+ }
+
+ q->queuedata = shost;
+ queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
+ blk_queue_softirq_done(q, fc_bsg_softirq_done);
+ blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
+ blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
+
+ err = bsg_register_queue(q, dev, bsg_name, NULL);
+ if (err) {
+ printk(KERN_ERR "fc_host%d: bsg interface failed to "
+ "initialize - register queue\n",
+ shost->host_no);
+ blk_cleanup_queue(q);
+ return err;
+ }
+
+ fc_host->rqst_q = q;
+ return 0;
+}
+
+
+/**
+ * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
+ * @shost: shost that rport is attached to
+ * @rport: rport that the bsg hooks are being attached to
+ */
+static int
+fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
+{
+ struct device *dev = &rport->dev;
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+ struct request_queue *q;
+ int err;
+
+ rport->rqst_q = NULL;
+
+ if (!i->f->bsg_request)
+ return -ENOTSUPP;
+
+ q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
+ if (!q) {
+ printk(KERN_ERR "%s: bsg interface failed to "
+ "initialize - no request queue\n",
+ dev->kobj.name);
+ return -ENOMEM;
+ }
+
+ q->queuedata = rport;
+ queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
+ blk_queue_softirq_done(q, fc_bsg_softirq_done);
+ blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
+ blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
+
+ err = bsg_register_queue(q, dev, NULL, NULL);
+ if (err) {
+ printk(KERN_ERR "%s: bsg interface failed to "
+ "initialize - register queue\n",
+ dev->kobj.name);
+ blk_cleanup_queue(q);
+ return err;
+ }
+
+ rport->rqst_q = q;
+ return 0;
+}
+
+
+/**
+ * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
+ * @q: the request_queue that is to be torn down.
+ */
+static void
+fc_bsg_remove(struct request_queue *q)
+{
+ if (q) {
+ bsg_unregister_queue(q);
+ blk_cleanup_queue(q);
+ }
+}
+
+
/* Original Author: Martin Hicks */
MODULE_AUTHOR("James Smart");
MODULE_DESCRIPTION("FC Transport Attributes");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff