[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>
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 778dc0f..8d4057e 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -291,7 +291,7 @@
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.
diff --git a/drivers/scsi/scsi_transport_srp.c b/drivers/scsi/scsi_transport_srp.c
index 608abd8..8e5b41c 100644
--- a/drivers/scsi/scsi_transport_srp.c
+++ b/drivers/scsi/scsi_transport_srp.c
@@ -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 @@
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 @@
{
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 @@
}
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 @@
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;
diff --git a/include/scsi/scsi_transport_srp.h b/include/scsi/scsi_transport_srp.h
index 08b4a28..a705dbc 100644
--- a/include/scsi/scsi_transport_srp.h
+++ b/include/scsi/scsi_transport_srp.h
@@ -21,7 +21,8 @@
};
struct srp_function_template {
- /* later */
+ /* for target drivers */
+ int (* it_nexus_response)(struct Scsi_Host *, u64, int);
};
extern struct scsi_transport_template *
