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Commit 9e4f5e29 authored by James Smart's avatar James Smart Committed by James Bottomley
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[SCSI] FC Pass Thru support 

Attached is the ELS/CT pass-thru patch for the FC Transport. The patch
creates a generic framework that lays on top of bsg and the SGIO v4 ioctl
in order to pass transaction requests to LLDD's.

The interface supports the following operations:
  On an fc_host basis:
    Request login to the specified N_Port_ID, creating an fc_rport.
    Request logout of the specified N_Port_ID, deleting an fc_rport
    Send ELS request to specified N_Port_ID w/o requiring a login, and
      wait for ELS response.
    Send CT request to specified N_Port_ID and wait for CT response.
      Login is required, but LLDD is allowed to manage login and decide
      whether it stays in place after the request is satisfied.
    Vendor-Unique request. Allows a LLDD-specific request to be passed
      to the LLDD, and the passing of a response back to the application.
  On an fc_rport basis:
    Send ELS request to nport and wait for ELS response.
    Send CT request to nport and wait for CT response.

The patch also exports several headers from include/scsi such that
they can be available to user-space applications:
  include/scsi/scsi.h
  include/scsi/scsi_netlink.h
  include/scsi/scsi_netlink_fc.h
  include/scsi/scsi_bsg_fc.h

For further information, refer to the last RFC:
http://marc.info/?l=linux-scsi&m=123436574018579&w=2



Note: Documentation is still spotty and will be added later.

[bharrosh@panasas.com: update for new block API]
Signed-off-by: default avatarJames Smart <james.smart@emulex.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent e349792a

Documentation/scsi/scsi_fc_transport.txt

+12 −2
Original line number Diff line number Diff line 
                             SCSI FC Tansport

                 =============================================



Date:  4/12/2007

Date:  11/18/2008

Kernel Revisions for features:

  rports : <<TBS>>

  vports : 2.6.22 (? TBD)

  vports : 2.6.22

  bsg support : 2.6.30 (?TBD?)





Introduction
@@ -15,6 +16,7 @@ The FC transport can be found at: 
  drivers/scsi/scsi_transport_fc.c

  include/scsi/scsi_transport_fc.h

  include/scsi/scsi_netlink_fc.h

  include/scsi/scsi_bsg_fc.h



This file is found at Documentation/scsi/scsi_fc_transport.txt
@@ -472,6 +474,14 @@ int 
fc_vport_terminate(struct fc_vport *vport)





FC BSG support (CT & ELS passthru, and more)

========================================================================

<< To Be Supplied >>











Credits

=======

The following people have contributed to this document:

Documentation/scsi/scsi_mid_low_api.txt

+5 −0
Original line number Diff line number Diff line
@@ -1271,6 +1271,11 @@ of interest: 
    hostdata[0]  - area reserved for LLD at end of struct Scsi_Host. Size

                   is set by the second argument (named 'xtr_bytes') to

                   scsi_host_alloc() or scsi_register().

    vendor_id    - a unique value that identifies the vendor supplying

                   the LLD for the Scsi_Host.  Used most often in validating

                   vendor-specific message requests.  Value consists of an

                   identifier type and a vendor-specific value.

                   See scsi_netlink.h for a description of valid formats.



The scsi_host structure is defined in include/scsi/scsi_host.h

drivers/scsi/scsi_transport_fc.c

+613 −1
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#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"
@@ -43,6 +44,10 @@ static void fc_vport_sched_delete(struct work_struct *work); 
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
@@ -411,13 +416,26 @@ static int fc_host_setup(struct transport_container *tc, struct device *dev, 
		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);



/*
@@ -2375,6 +2393,7 @@ fc_rport_final_delete(struct work_struct *work) 
		scsi_flush_work(shost);



	fc_terminate_rport_io(rport);



	/*

	 * Cancel any outstanding timers. These should really exist

	 * only when rmmod'ing the LLDD and we're asking for
@@ -2407,6 +2426,8 @@ fc_rport_final_delete(struct work_struct *work) 
	    (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);
@@ -2494,6 +2515,9 @@ fc_rport_create(struct Scsi_Host *shost, int channel, 
	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;
@@ -2658,6 +2682,8 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel, 
					spin_unlock_irqrestore(shost->host_lock,

							flags);



				fc_bsg_goose_queue(rport);



				return rport;

			}

		}
@@ -3343,6 +3369,592 @@ fc_vport_sched_delete(struct work_struct *work) 
}





/*

 * 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;

	unsigned long flags;

	int err;



	spin_lock_irqsave(&job->job_lock, flags);

	job->state_flags |= FC_RQST_STATE_DONE;

	job->ref_cnt--;

	spin_unlock_irqrestore(&job->job_lock, flags);



	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_end_request_all(req, err);



	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);

	}



	if (!done) {

		spin_lock_irqsave(&job->job_lock, flags);

		job->ref_cnt--;

		spin_unlock_irqrestore(&job->job_lock, flags);

		fc_destroy_bsgjob(job);

	}



	/* the blk_end_sync_io() doesn't check the error */

	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

 * @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;



	if (!rport->rqst_q)

		return;



	get_device(&rport->dev);



	spin_lock(rport->rqst_q->queue_lock);

	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(rport->rqst_q->queue_lock);



	put_device(&rport->dev);

}





/**

 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD

 * @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[BUS_ID_SIZE]; /*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_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_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");

include/Kbuild

+1 −0
Original line number Diff line number Diff line
@@ -9,3 +9,4 @@ header-y += rdma/ 
header-y += video/

header-y += drm/

header-y += xen/

header-y += scsi/

include/scsi/Kbuild

0 → 100644
+4 −0
Original line number Diff line number Diff line 
header-y += scsi.h

header-y += scsi_netlink.h

header-y += scsi_netlink_fc.h

header-y += scsi_bsg_fc.h