diff options
Diffstat (limited to 'drivers/scsi/scsi_transport_srp.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_srp.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_srp.c b/drivers/scsi/scsi_transport_srp.c new file mode 100644 index 000000000000..44a340bd937b --- /dev/null +++ b/drivers/scsi/scsi_transport_srp.c @@ -0,0 +1,381 @@ +/* + * SCSI RDMA (SRP) transport class + * + * Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org> + * + * 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, version 2 of the + * License. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/jiffies.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/string.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_srp.h> +#include "scsi_transport_srp_internal.h" + +struct srp_host_attrs { + atomic_t next_port_id; +}; +#define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data) + +#define SRP_HOST_ATTRS 0 +#define SRP_RPORT_ATTRS 2 + +struct srp_internal { + struct scsi_transport_template t; + struct srp_function_template *f; + + struct class_device_attribute *host_attrs[SRP_HOST_ATTRS + 1]; + + struct class_device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1]; + struct class_device_attribute private_rport_attrs[SRP_RPORT_ATTRS]; + struct transport_container rport_attr_cont; +}; + +#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t) + +#define dev_to_rport(d) container_of(d, struct srp_rport, dev) +#define transport_class_to_srp_rport(cdev) dev_to_rport((cdev)->dev) + +static int srp_host_setup(struct transport_container *tc, struct device *dev, + struct class_device *cdev) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + struct srp_host_attrs *srp_host = to_srp_host_attrs(shost); + + atomic_set(&srp_host->next_port_id, 0); + return 0; +} + +static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup, + NULL, NULL); + +static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports", + NULL, NULL, NULL); + +#define SETUP_TEMPLATE(attrb, field, perm, test, ro_test, ro_perm) \ + i->private_##attrb[count] = class_device_attr_##field; \ + i->private_##attrb[count].attr.mode = perm; \ + if (ro_test) { \ + i->private_##attrb[count].attr.mode = ro_perm; \ + i->private_##attrb[count].store = NULL; \ + } \ + i->attrb[count] = &i->private_##attrb[count]; \ + if (test) \ + count++ + +#define SETUP_RPORT_ATTRIBUTE_RD(field) \ + SETUP_TEMPLATE(rport_attrs, field, S_IRUGO, 1, 0, 0) + +#define SETUP_RPORT_ATTRIBUTE_RW(field) \ + SETUP_TEMPLATE(rport_attrs, field, S_IRUGO | S_IWUSR, \ + 1, 1, S_IRUGO) + +#define SRP_PID(p) \ + (p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \ + (p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \ + (p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \ + (p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15] + +#define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \ + "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x" + +static ssize_t +show_srp_rport_id(struct class_device *cdev, char *buf) +{ + struct srp_rport *rport = transport_class_to_srp_rport(cdev); + return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport)); +} + +static CLASS_DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL); + +static const struct { + u32 value; + char *name; +} srp_rport_role_names[] = { + {SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"}, + {SRP_RPORT_ROLE_TARGET, "SRP Target"}, +}; + +static ssize_t +show_srp_rport_roles(struct class_device *cdev, char *buf) +{ + struct srp_rport *rport = transport_class_to_srp_rport(cdev); + int i; + char *name = NULL; + + for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++) + if (srp_rport_role_names[i].value == rport->roles) { + name = srp_rport_role_names[i].name; + break; + } + return sprintf(buf, "%s\n", name ? : "unknown"); +} + +static CLASS_DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL); + +static void srp_rport_release(struct device *dev) +{ + struct srp_rport *rport = dev_to_rport(dev); + + put_device(dev->parent); + kfree(rport); +} + +static int scsi_is_srp_rport(const struct device *dev) +{ + return dev->release == srp_rport_release; +} + +static int srp_rport_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct srp_internal *i; + + if (!scsi_is_srp_rport(dev)) + return 0; + + shost = dev_to_shost(dev->parent); + if (!shost->transportt) + return 0; + if (shost->transportt->host_attrs.ac.class != &srp_host_class.class) + return 0; + + i = to_srp_internal(shost->transportt); + return &i->rport_attr_cont.ac == cont; +} + +static int srp_host_match(struct attribute_container *cont, struct device *dev) +{ + struct Scsi_Host *shost; + struct srp_internal *i; + + if (!scsi_is_host_device(dev)) + return 0; + + shost = dev_to_shost(dev); + if (!shost->transportt) + return 0; + if (shost->transportt->host_attrs.ac.class != &srp_host_class.class) + return 0; + + i = to_srp_internal(shost->transportt); + return &i->t.host_attrs.ac == cont; +} + +/** + * srp_rport_add - add a SRP remote port to the device hierarchy + * + * @shost: scsi host the remote port is connected to. + * @ids: The port id for the remote port. + * + * publishes a port to the rest of the system + */ +struct srp_rport *srp_rport_add(struct Scsi_Host *shost, + struct srp_rport_identifiers *ids) +{ + struct srp_rport *rport; + struct device *parent = &shost->shost_gendev; + int id, ret; + + rport = kzalloc(sizeof(*rport), GFP_KERNEL); + if (!rport) + return ERR_PTR(-ENOMEM); + + device_initialize(&rport->dev); + + rport->dev.parent = get_device(parent); + rport->dev.release = srp_rport_release; + + memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id)); + rport->roles = ids->roles; + + id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id); + sprintf(rport->dev.bus_id, "port-%d:%d", shost->host_no, id); + + transport_setup_device(&rport->dev); + + ret = device_add(&rport->dev); + if (ret) { + transport_destroy_device(&rport->dev); + put_device(&rport->dev); + return ERR_PTR(ret); + } + + if (shost->active_mode & MODE_TARGET && + ids->roles == SRP_RPORT_ROLE_INITIATOR) { + ret = srp_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); + + return rport; +} +EXPORT_SYMBOL_GPL(srp_rport_add); + +/** + * srp_rport_del -- remove a SRP remote port + * @port: SRP remote port to remove + * + * Removes the specified SRP remote port. + */ +void srp_rport_del(struct srp_rport *rport) +{ + struct device *dev = &rport->dev; + struct Scsi_Host *shost = dev_to_shost(dev->parent); + + if (shost->active_mode & MODE_TARGET && + rport->roles == SRP_RPORT_ROLE_INITIATOR) + srp_tgt_it_nexus_destroy(shost, (unsigned long)rport); + + transport_remove_device(dev); + device_del(dev); + transport_destroy_device(dev); + put_device(dev); +} +EXPORT_SYMBOL_GPL(srp_rport_del); + +static int do_srp_rport_del(struct device *dev, void *data) +{ + srp_rport_del(dev_to_rport(dev)); + return 0; +} + +/** + * srp_remove_host -- tear down a Scsi_Host's SRP data structures + * @shost: Scsi Host that is torn down + * + * Removes all SRP remote ports for a given Scsi_Host. + * Must be called just before scsi_remove_host for SRP HBAs. + */ +void srp_remove_host(struct Scsi_Host *shost) +{ + device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del); +} +EXPORT_SYMBOL_GPL(srp_remove_host); + +static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id, + int result) +{ + struct srp_internal *i = to_srp_internal(shost->transportt); + return i->f->tsk_mgmt_response(shost, nexus, tm_id, result); +} + +static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result) +{ + struct srp_internal *i = to_srp_internal(shost->transportt); + return i->f->it_nexus_response(shost, nexus, result); +} + +/** + * srp_attach_transport -- instantiate SRP transport template + * @ft: SRP transport class function template + */ +struct scsi_transport_template * +srp_attach_transport(struct srp_function_template *ft) +{ + int count; + struct srp_internal *i; + + i = kzalloc(sizeof(*i), GFP_KERNEL); + if (!i) + return NULL; + + i->t.tsk_mgmt_response = srp_tsk_mgmt_response; + 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; + i->t.host_attrs.ac.match = srp_host_match; + i->host_attrs[0] = NULL; + transport_container_register(&i->t.host_attrs); + + i->rport_attr_cont.ac.attrs = &i->rport_attrs[0]; + i->rport_attr_cont.ac.class = &srp_rport_class.class; + i->rport_attr_cont.ac.match = srp_rport_match; + transport_container_register(&i->rport_attr_cont); + + count = 0; + SETUP_RPORT_ATTRIBUTE_RD(port_id); + SETUP_RPORT_ATTRIBUTE_RD(roles); + i->rport_attrs[count] = NULL; + + i->f = ft; + + return &i->t; +} +EXPORT_SYMBOL_GPL(srp_attach_transport); + +/** + * srp_release_transport -- release SRP transport template instance + * @t: transport template instance + */ +void srp_release_transport(struct scsi_transport_template *t) +{ + struct srp_internal *i = to_srp_internal(t); + + transport_container_unregister(&i->t.host_attrs); + transport_container_unregister(&i->rport_attr_cont); + + kfree(i); +} +EXPORT_SYMBOL_GPL(srp_release_transport); + +static __init int srp_transport_init(void) +{ + int ret; + + ret = transport_class_register(&srp_host_class); + if (ret) + return ret; + ret = transport_class_register(&srp_rport_class); + if (ret) + goto unregister_host_class; + + return 0; +unregister_host_class: + transport_class_unregister(&srp_host_class); + return ret; +} + +static void __exit srp_transport_exit(void) +{ + transport_class_unregister(&srp_host_class); + transport_class_unregister(&srp_rport_class); +} + +MODULE_AUTHOR("FUJITA Tomonori"); +MODULE_DESCRIPTION("SRP Transport Attributes"); +MODULE_LICENSE("GPL"); + +module_init(srp_transport_init); +module_exit(srp_transport_exit); |
