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[SCSI] srp_transport: add target driver support 

This adds minimum target driver support:

- srp_rport_{add,del} calls scsi_tgt_it_nexus_{create,destroy} for
target drivers.

- add a callback to notify target drivers of the nexus operation
results to srp_function_template.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori 2007-07-11 15:08:19 +09:00 committed by James Bottomley
parent 2c47f9efbe
commit 62fe88261b
3 changed files with 27 additions and 2 deletions
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2
drivers/scsi/Kconfig
View File

@ -291,7 +291,7 @@ source "drivers/scsi/libsas/Kconfig"
config SCSI_SRP_ATTRS
tristate "SRP Transport Attributes"
depends on SCSI
depends on SCSI && SCSI_TGT
help
If you wish to export transport-specific information about
each attached SRP device to sysfs, say Y.

24
drivers/scsi/scsi_transport_srp.c
View File

@ -30,6 +30,7 @@
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_srp.h>
#include <scsi/scsi_tgt.h>
struct srp_host_attrs {
atomic_t next_port_id;
@ -221,6 +222,17 @@ struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
return ERR_PTR(ret);
}
if (ids->roles == SRP_RPORT_ROLE_INITIATOR) {
ret = scsi_tgt_it_nexus_create(shost, (unsigned long)rport,
rport->port_id);
if (ret) {
device_del(&rport->dev);
transport_destroy_device(&rport->dev);
put_device(&rport->dev);
return ERR_PTR(ret);
}
}
transport_add_device(&rport->dev);
transport_configure_device(&rport->dev);
@ -238,6 +250,10 @@ void srp_rport_del(struct srp_rport *rport)
{
struct device *dev = &rport->dev;
if (rport->roles == SRP_RPORT_ROLE_INITIATOR)
scsi_tgt_it_nexus_destroy(dev_to_shost(dev->parent),
(unsigned long)rport);
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
@ -264,6 +280,12 @@ void srp_remove_host(struct Scsi_Host *shost)
}
EXPORT_SYMBOL_GPL(srp_remove_host);
static int srp_it_nexus_response(struct Scsi_Host *shost, u64 id, int result)
{
struct srp_internal *i = to_srp_internal(shost->transportt);
return i->f->it_nexus_response(shost, id, result);
}
/**
* srp_attach_transport -- instantiate SRP transport template
* @ft: SRP transport class function template
@ -278,6 +300,8 @@ srp_attach_transport(struct srp_function_template *ft)
if (!i)
return NULL;
i->t.it_nexus_response = srp_it_nexus_response;
i->t.host_size = sizeof(struct srp_host_attrs);
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
i->t.host_attrs.ac.class = &srp_host_class.class;

3
include/scsi/scsi_transport_srp.h
View File

@ -21,7 +21,8 @@ struct srp_rport {
};
struct srp_function_template {
/* later */
/* for target drivers */
int (* it_nexus_response)(struct Scsi_Host *, u64, int);
};
extern struct scsi_transport_template *