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[SCSI] FC Pass Thru support

Browse source 
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: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Smart 2009-03-26 13:33:19 -04:00 committed by James Bottomley
parent e349792a38
commit 9e4f5e2961
8 changed files with 1016 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
Documentation/scsi/scsi_fc_transport.txt
View file

@ -1,10 +1,11 @@
SCSI FC Tansport SCSI FC Tansport
============================================= =============================================
Date: 4/12/2007 Date: 11/18/2008
Kernel Revisions for features: Kernel Revisions for features:
rports : <<TBS>> rports : <<TBS>>
vports : 2.6.22 (? TBD) vports : 2.6.22
bsg support : 2.6.30 (?TBD?)
Introduction Introduction
@ -15,6 +16,7 @@ The FC transport can be found at:
drivers/scsi/scsi_transport_fc.c drivers/scsi/scsi_transport_fc.c
include/scsi/scsi_transport_fc.h include/scsi/scsi_transport_fc.h
include/scsi/scsi_netlink_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 This file is found at Documentation/scsi/scsi_fc_transport.txt
@ -472,6 +474,14 @@ int
fc_vport_terminate(struct fc_vport *vport) fc_vport_terminate(struct fc_vport *vport)
FC BSG support (CT & ELS passthru, and more)
========================================================================
<< To Be Supplied >>
Credits Credits
======= =======
The following people have contributed to this document: The following people have contributed to this document:

5
Documentation/scsi/scsi_mid_low_api.txt
View file

@ -1271,6 +1271,11 @@ of interest:
hostdata[0] - area reserved for LLD at end of struct Scsi_Host. Size hostdata[0] - area reserved for LLD at end of struct Scsi_Host. Size
is set by the second argument (named 'xtr_bytes') to is set by the second argument (named 'xtr_bytes') to
scsi_host_alloc() or scsi_register(). 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 The scsi_host structure is defined in include/scsi/scsi_host.h

614
drivers/scsi/scsi_transport_fc.c
View file

@ -35,6 +35,7 @@
#include <linux/netlink.h> #include <linux/netlink.h>
#include <net/netlink.h> #include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h> #include <scsi/scsi_netlink_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include "scsi_priv.h" #include "scsi_priv.h"
#include "scsi_transport_fc_internal.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, static int fc_vport_setup(struct Scsi_Host *shost, int channel,
struct device *pdev, struct fc_vport_identifiers *ids, struct device *pdev, struct fc_vport_identifiers *ids,
struct fc_vport **vport); 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 * 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; 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; return 0;
} }
static DECLARE_TRANSPORT_CLASS(fc_host_class, static DECLARE_TRANSPORT_CLASS(fc_host_class,
"fc_host", "fc_host",
fc_host_setup, fc_host_setup,
NULL, fc_host_remove,
NULL); NULL);
/* /*
@ -2375,6 +2393,7 @@ fc_rport_final_delete(struct work_struct *work)
scsi_flush_work(shost); scsi_flush_work(shost);
fc_terminate_rport_io(rport); fc_terminate_rport_io(rport);
/* /*
* Cancel any outstanding timers. These should really exist * Cancel any outstanding timers. These should really exist
* only when rmmod'ing the LLDD and we're asking for * 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))
i->f->dev_loss_tmo_callbk(rport); i->f->dev_loss_tmo_callbk(rport);
fc_bsg_remove(rport->rqst_q);
transport_remove_device(dev); transport_remove_device(dev);
device_del(dev); device_del(dev);
transport_destroy_device(dev); transport_destroy_device(dev);
@ -2494,6 +2515,9 @@ fc_rport_create(struct Scsi_Host *shost, int channel,
transport_add_device(dev); transport_add_device(dev);
transport_configure_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) { if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
/* initiate a scan of the target */ /* initiate a scan of the target */
rport->flags |= FC_RPORT_SCAN_PENDING; 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, spin_unlock_irqrestore(shost->host_lock,
flags); flags);
fc_bsg_goose_queue(rport);
return 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 */ /* Original Author: Martin Hicks */
MODULE_AUTHOR("James Smart"); MODULE_AUTHOR("James Smart");
MODULE_DESCRIPTION("FC Transport Attributes"); MODULE_DESCRIPTION("FC Transport Attributes");

1
include/Kbuild
View file

@ -9,3 +9,4 @@ header-y += rdma/
header-y += video/ header-y += video/
header-y += drm/ header-y += drm/
header-y += xen/ header-y += xen/
header-y += scsi/

4
include/scsi/Kbuild Normal file
View file

@ -0,0 +1,4 @@
header-y += scsi.h
header-y += scsi_netlink.h
header-y += scsi_netlink_fc.h
header-y += scsi_bsg_fc.h

322
include/scsi/scsi_bsg_fc.h Normal file
View file

@ -0,0 +1,322 @@
/*
* FC Transport BSG Interface
*
* Copyright (C) 2008 James Smart, Emulex Corporation
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef SCSI_BSG_FC_H
#define SCSI_BSG_FC_H
/*
* This file intended to be included by both kernel and user space
*/
#include <scsi/scsi.h>
/*
* FC Transport SGIO v4 BSG Message Support
*/
/* Default BSG request timeout (in seconds) */
#define FC_DEFAULT_BSG_TIMEOUT (10 * HZ)
/*
* Request Message Codes supported by the FC Transport
*/
/* define the class masks for the message codes */
#define FC_BSG_CLS_MASK 0xF0000000 /* find object class */
#define FC_BSG_HST_MASK 0x80000000 /* fc host class */
#define FC_BSG_RPT_MASK 0x40000000 /* fc rport class */
/* fc_host Message Codes */
#define FC_BSG_HST_ADD_RPORT (FC_BSG_HST_MASK | 0x00000001)
#define FC_BSG_HST_DEL_RPORT (FC_BSG_HST_MASK | 0x00000002)
#define FC_BSG_HST_ELS_NOLOGIN (FC_BSG_HST_MASK | 0x00000003)
#define FC_BSG_HST_CT (FC_BSG_HST_MASK | 0x00000004)
#define FC_BSG_HST_VENDOR (FC_BSG_HST_MASK | 0x000000FF)
/* fc_rport Message Codes */
#define FC_BSG_RPT_ELS (FC_BSG_RPT_MASK | 0x00000001)
#define FC_BSG_RPT_CT (FC_BSG_RPT_MASK | 0x00000002)
/*
* FC Address Identifiers in Message Structures :
*
* Whenever a command payload contains a FC Address Identifier
* (aka port_id), the value is effectively in big-endian
* order, thus the array elements are decoded as follows:
* element [0] is bits 23:16 of the FC Address Identifier
* element [1] is bits 15:8 of the FC Address Identifier
* element [2] is bits 7:0 of the FC Address Identifier
*/
/*
* FC Host Messages
*/
/* FC_BSG_HST_ADDR_PORT : */
/* Request:
* This message requests the FC host to login to the remote port
* at the specified N_Port_Id. The remote port is to be enumerated
* with the transport upon completion of the login.
*/
struct fc_bsg_host_add_rport {
uint8_t reserved;
/* FC Address Identier of the remote port to login to */
uint8_t port_id[3];
};
/* Response:
* There is no additional response data - fc_bsg_reply->result is sufficient
*/
/* FC_BSG_HST_DEL_RPORT : */
/* Request:
* This message requests the FC host to remove an enumerated
* remote port and to terminate the login to it.
*
* Note: The driver is free to reject this request if it desires to
* remain logged in with the remote port.
*/
struct fc_bsg_host_del_rport {
uint8_t reserved;
/* FC Address Identier of the remote port to logout of */
uint8_t port_id[3];
};
/* Response:
* There is no additional response data - fc_bsg_reply->result is sufficient
*/
/* FC_BSG_HST_ELS_NOLOGIN : */
/* Request:
* This message requests the FC_Host to send an ELS to a specific
* N_Port_ID. The host does not need to log into the remote port,
* nor does it need to enumerate the rport for further traffic
* (although, the FC host is free to do so if it desires).
*/
struct fc_bsg_host_els {
/*
* ELS Command Code being sent (must be the same as byte 0
* of the payload)
*/
uint8_t command_code;
/* FC Address Identier of the remote port to send the ELS to */
uint8_t port_id[3];
};
/* Response:
*/
/* fc_bsg_ctels_reply->status values */
#define FC_CTELS_STATUS_OK 0x00000000
#define FC_CTELS_STATUS_REJECT 0x00000001
#define FC_CTELS_STATUS_P_RJT 0x00000002
#define FC_CTELS_STATUS_F_RJT 0x00000003
#define FC_CTELS_STATUS_P_BSY 0x00000004
#define FC_CTELS_STATUS_F_BSY 0x00000006
struct fc_bsg_ctels_reply {
/*
* Note: An ELS LS_RJT may be reported in 2 ways:
* a) A status of FC_CTELS_STATUS_OK is returned. The caller
* is to look into the ELS receive payload to determine
* LS_ACC or LS_RJT (by contents of word 0). The reject
* data will be in word 1.
* b) A status of FC_CTELS_STATUS_REJECT is returned, The
* rjt_data field will contain valid data.
*
* Note: ELS LS_ACC is determined by an FC_CTELS_STATUS_OK, and
* the receive payload word 0 indicates LS_ACC
* (e.g. value is 0x02xxxxxx).
*
* Note: Similarly, a CT Reject may be reported in 2 ways:
* a) A status of FC_CTELS_STATUS_OK is returned. The caller
* is to look into the CT receive payload to determine
* Accept or Reject (by contents of word 2). The reject
* data will be in word 3.
* b) A status of FC_CTELS_STATUS_REJECT is returned, The
* rjt_data field will contain valid data.
*
* Note: x_RJT/BSY status will indicae that the rjt_data field
* is valid and contains the reason/explanation values.
*/
uint32_t status; /* See FC_CTELS_STATUS_xxx */
/* valid if status is not FC_CTELS_STATUS_OK */
struct {
uint8_t action; /* fragment_id for CT REJECT */
uint8_t reason_code;
uint8_t reason_explanation;
uint8_t vendor_unique;
} rjt_data;
};
/* FC_BSG_HST_CT : */
/* Request:
* This message requests that a CT Request be performed with the
* indicated N_Port_ID. The driver is responsible for logging in with
* the fabric and/or N_Port_ID, etc as per FC rules. This request does
* not mandate that the driver must enumerate the destination in the
* transport. The driver is allowed to decide whether to enumerate it,
* and whether to tear it down after the request.
*/
struct fc_bsg_host_ct {
uint8_t reserved;
/* FC Address Identier of the remote port to send the ELS to */
uint8_t port_id[3];
/*
* We need words 0-2 of the generic preamble for the LLD's
*/
uint32_t preamble_word0; /* revision & IN_ID */
uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
uint32_t preamble_word2; /* Cmd Code, Max Size */
};
/* Response:
*
* The reply structure is an fc_bsg_ctels_reply structure
*/
/* FC_BSG_HST_VENDOR : */
/* Request:
* Note: When specifying vendor_id, be sure to read the Vendor Type and ID
* formatting requirements specified in scsi_netlink.h
*/
struct fc_bsg_host_vendor {
/*
* Identifies the vendor that the message is formatted for. This
* should be the recipient of the message.
*/
uint64_t vendor_id;
/* start of vendor command area */
uint32_t vendor_cmd[0];
};
/* Response:
*/
struct fc_bsg_host_vendor_reply {
/* start of vendor response area */
uint32_t vendor_rsp[0];
};
/*
* FC Remote Port Messages
*/
/* FC_BSG_RPT_ELS : */
/* Request:
* This message requests that an ELS be performed with the rport.
*/
struct fc_bsg_rport_els {
/*
* ELS Command Code being sent (must be the same as
* byte 0 of the payload)
*/
uint8_t els_code;
};
/* Response:
*
* The reply structure is an fc_bsg_ctels_reply structure
*/
/* FC_BSG_RPT_CT : */
/* Request:
* This message requests that a CT Request be performed with the rport.
*/
struct fc_bsg_rport_ct {
/*
* We need words 0-2 of the generic preamble for the LLD's
*/
uint32_t preamble_word0; /* revision & IN_ID */
uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */
uint32_t preamble_word2; /* Cmd Code, Max Size */
};
/* Response:
*
* The reply structure is an fc_bsg_ctels_reply structure
*/
/* request (CDB) structure of the sg_io_v4 */
struct fc_bsg_request {
uint32_t msgcode;
union {
struct fc_bsg_host_add_rport h_addrport;
struct fc_bsg_host_del_rport h_delrport;
struct fc_bsg_host_els h_els;
struct fc_bsg_host_ct h_ct;
struct fc_bsg_host_vendor h_vendor;
struct fc_bsg_rport_els r_els;
struct fc_bsg_rport_ct r_ct;
} rqst_data;
};
/* response (request sense data) structure of the sg_io_v4 */
struct fc_bsg_reply {
/*
* The completion result. Result exists in two forms:
* if negative, it is an -Exxx system errno value. There will
* be no further reply information supplied.
* else, it's the 4-byte scsi error result, with driver, host,
* msg and status fields. The per-msgcode reply structure
* will contain valid data.
*/
uint32_t result;
/* If there was reply_payload, how much was recevied ? */
uint32_t reply_payload_rcv_len;
union {
struct fc_bsg_host_vendor_reply vendor_reply;
struct fc_bsg_ctels_reply ctels_reply;
} reply_data;
};
#endif /* SCSI_BSG_FC_H */

9
include/scsi/scsi_host.h
View file

@ -478,6 +478,15 @@ struct scsi_host_template {
* module_init/module_exit. * module_init/module_exit.
*/ */
struct list_head legacy_hosts; struct list_head legacy_hosts;
/*
* Vendor Identifier associated with the host
*
* Note: When specifying vendor_id, be sure to read the
* Vendor Type and ID formatting requirements specified in
* scsi_netlink.h
*/
u64 vendor_id;
}; };
/* /*

52
include/scsi/scsi_transport_fc.h
View file

@ -33,7 +33,6 @@
struct scsi_transport_template; struct scsi_transport_template;
/* /*
* FC Port definitions - Following FC HBAAPI guidelines * FC Port definitions - Following FC HBAAPI guidelines
* *
@ -352,6 +351,7 @@ struct fc_rport { /* aka fc_starget_attrs */
struct delayed_work fail_io_work; struct delayed_work fail_io_work;
struct work_struct stgt_delete_work; struct work_struct stgt_delete_work;
struct work_struct rport_delete_work; struct work_struct rport_delete_work;
struct request_queue *rqst_q; /* bsg support */
} __attribute__((aligned(sizeof(unsigned long)))); } __attribute__((aligned(sizeof(unsigned long))));
/* bit field values for struct fc_rport "flags" field: */ /* bit field values for struct fc_rport "flags" field: */
@ -514,6 +514,9 @@ struct fc_host_attrs {
struct workqueue_struct *work_q; struct workqueue_struct *work_q;
char devloss_work_q_name[20]; char devloss_work_q_name[20];
struct workqueue_struct *devloss_work_q; struct workqueue_struct *devloss_work_q;
/* bsg support */
struct request_queue *rqst_q;
}; };
#define shost_to_fc_host(x) \ #define shost_to_fc_host(x) \
@ -579,6 +582,47 @@ struct fc_host_attrs {
(((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q) (((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q)
struct fc_bsg_buffer {
unsigned int payload_len;
int sg_cnt;
struct scatterlist *sg_list;
};
/* Values for fc_bsg_job->state_flags (bitflags) */
#define FC_RQST_STATE_INPROGRESS 0
#define FC_RQST_STATE_DONE 1
struct fc_bsg_job {
struct Scsi_Host *shost;
struct fc_rport *rport;
struct device *dev;
struct request *req;
spinlock_t job_lock;
unsigned int state_flags;
unsigned int ref_cnt;
void (*job_done)(struct fc_bsg_job *);
struct fc_bsg_request *request;
struct fc_bsg_reply *reply;
unsigned int request_len;
unsigned int reply_len;
/*
* On entry : reply_len indicates the buffer size allocated for
* the reply.
*
* Upon completion : the message handler must set reply_len
* to indicates the size of the reply to be returned to the
* caller.
*/
/* DMA payloads for the request/response */
struct fc_bsg_buffer request_payload;
struct fc_bsg_buffer reply_payload;
void *dd_data; /* Used for driver-specific storage */
};
/* The functions by which the transport class and the driver communicate */ /* The functions by which the transport class and the driver communicate */
struct fc_function_template { struct fc_function_template {
void (*get_rport_dev_loss_tmo)(struct fc_rport *); void (*get_rport_dev_loss_tmo)(struct fc_rport *);
@ -614,9 +658,14 @@ struct fc_function_template {
int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int); int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
int (* it_nexus_response)(struct Scsi_Host *, u64, int); int (* it_nexus_response)(struct Scsi_Host *, u64, int);
/* bsg support */
int (*bsg_request)(struct fc_bsg_job *);
int (*bsg_timeout)(struct fc_bsg_job *);
/* allocation lengths for host-specific data */ /* allocation lengths for host-specific data */
u32 dd_fcrport_size; u32 dd_fcrport_size;
u32 dd_fcvport_size; u32 dd_fcvport_size;
u32 dd_bsg_size;
/* /*
* The driver sets these to tell the transport class it * The driver sets these to tell the transport class it
@ -737,7 +786,6 @@ fc_vport_set_state(struct fc_vport *vport, enum fc_vport_state new_state)
vport->vport_state = new_state; vport->vport_state = new_state;
} }
struct scsi_transport_template *fc_attach_transport( struct scsi_transport_template *fc_attach_transport(
struct fc_function_template *); struct fc_function_template *);
void fc_release_transport(struct scsi_transport_template *); void fc_release_transport(struct scsi_transport_template *);