2007-06-27 00:32:39 -07:00
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/*
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* SCSI RDMA (SRP) transport class
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*
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* Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_srp.h>
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2007-08-01 08:20:34 -07:00
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#include "scsi_transport_srp_internal.h"
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2007-06-27 00:32:39 -07:00
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struct srp_host_attrs {
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atomic_t next_port_id;
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};
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#define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
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#define SRP_HOST_ATTRS 0
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2011-09-16 11:41:13 -07:00
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#define SRP_RPORT_ATTRS 3
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2007-06-27 00:32:39 -07:00
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struct srp_internal {
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struct scsi_transport_template t;
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struct srp_function_template *f;
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2008-02-21 16:13:36 -07:00
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struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
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2007-06-27 00:32:39 -07:00
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2008-02-21 16:13:36 -07:00
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struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
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2007-06-27 00:32:39 -07:00
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struct transport_container rport_attr_cont;
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};
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#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
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#define dev_to_rport(d) container_of(d, struct srp_rport, dev)
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2008-02-21 16:13:36 -07:00
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#define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent)
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2007-06-27 00:32:39 -07:00
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static int srp_host_setup(struct transport_container *tc, struct device *dev,
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2008-02-21 16:13:36 -07:00
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struct device *cdev)
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2007-06-27 00:32:39 -07:00
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{
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struct Scsi_Host *shost = dev_to_shost(dev);
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struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);
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atomic_set(&srp_host->next_port_id, 0);
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return 0;
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}
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static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,
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NULL, NULL);
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static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",
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NULL, NULL, NULL);
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#define SRP_PID(p) \
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(p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \
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(p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \
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(p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \
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(p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15]
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#define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \
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"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
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static ssize_t
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2008-02-21 16:13:36 -07:00
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show_srp_rport_id(struct device *dev, struct device_attribute *attr,
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char *buf)
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2007-06-27 00:32:39 -07:00
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{
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2008-02-21 16:13:36 -07:00
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struct srp_rport *rport = transport_class_to_srp_rport(dev);
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2007-06-27 00:32:39 -07:00
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return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
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}
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2008-02-21 16:13:36 -07:00
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static DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
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2007-06-27 00:32:39 -07:00
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2007-07-10 23:08:15 -07:00
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static const struct {
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u32 value;
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char *name;
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} srp_rport_role_names[] = {
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{SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},
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{SRP_RPORT_ROLE_TARGET, "SRP Target"},
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};
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static ssize_t
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2008-02-21 16:13:36 -07:00
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show_srp_rport_roles(struct device *dev, struct device_attribute *attr,
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char *buf)
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2007-07-10 23:08:15 -07:00
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{
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2008-02-21 16:13:36 -07:00
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struct srp_rport *rport = transport_class_to_srp_rport(dev);
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2007-07-10 23:08:15 -07:00
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int i;
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char *name = NULL;
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for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)
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if (srp_rport_role_names[i].value == rport->roles) {
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name = srp_rport_role_names[i].name;
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break;
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}
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return sprintf(buf, "%s\n", name ? : "unknown");
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}
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2008-02-21 16:13:36 -07:00
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static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);
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2007-07-10 23:08:15 -07:00
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2011-09-16 11:41:13 -07:00
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static ssize_t store_srp_rport_delete(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct srp_rport *rport = transport_class_to_srp_rport(dev);
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struct Scsi_Host *shost = dev_to_shost(dev);
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struct srp_internal *i = to_srp_internal(shost->transportt);
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if (i->f->rport_delete) {
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i->f->rport_delete(rport);
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return count;
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} else {
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return -ENOSYS;
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}
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}
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static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);
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2007-06-27 00:32:39 -07:00
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static void srp_rport_release(struct device *dev)
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{
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struct srp_rport *rport = dev_to_rport(dev);
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put_device(dev->parent);
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kfree(rport);
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}
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static int scsi_is_srp_rport(const struct device *dev)
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{
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return dev->release == srp_rport_release;
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}
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static int srp_rport_match(struct attribute_container *cont,
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struct device *dev)
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{
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struct Scsi_Host *shost;
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struct srp_internal *i;
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if (!scsi_is_srp_rport(dev))
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return 0;
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shost = dev_to_shost(dev->parent);
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if (!shost->transportt)
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return 0;
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if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
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return 0;
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i = to_srp_internal(shost->transportt);
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return &i->rport_attr_cont.ac == cont;
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}
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static int srp_host_match(struct attribute_container *cont, struct device *dev)
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{
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struct Scsi_Host *shost;
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struct srp_internal *i;
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if (!scsi_is_host_device(dev))
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return 0;
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shost = dev_to_shost(dev);
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if (!shost->transportt)
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return 0;
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if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)
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return 0;
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i = to_srp_internal(shost->transportt);
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return &i->t.host_attrs.ac == cont;
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}
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/**
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* srp_rport_add - add a SRP remote port to the device hierarchy
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* @shost: scsi host the remote port is connected to.
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* @ids: The port id for the remote port.
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*
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2007-11-15 16:42:30 -07:00
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* Publishes a port to the rest of the system.
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2007-06-27 00:32:39 -07:00
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*/
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struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
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struct srp_rport_identifiers *ids)
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{
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struct srp_rport *rport;
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struct device *parent = &shost->shost_gendev;
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int id, ret;
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rport = kzalloc(sizeof(*rport), GFP_KERNEL);
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if (!rport)
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return ERR_PTR(-ENOMEM);
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device_initialize(&rport->dev);
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rport->dev.parent = get_device(parent);
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rport->dev.release = srp_rport_release;
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memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));
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2007-07-10 23:08:15 -07:00
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rport->roles = ids->roles;
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2007-06-27 00:32:39 -07:00
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id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
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2008-12-03 14:41:36 -07:00
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dev_set_name(&rport->dev, "port-%d:%d", shost->host_no, id);
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2007-06-27 00:32:39 -07:00
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transport_setup_device(&rport->dev);
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ret = device_add(&rport->dev);
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if (ret) {
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transport_destroy_device(&rport->dev);
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put_device(&rport->dev);
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return ERR_PTR(ret);
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}
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2007-08-31 10:03:39 -07:00
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if (shost->active_mode & MODE_TARGET &&
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ids->roles == SRP_RPORT_ROLE_INITIATOR) {
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2007-08-01 08:20:34 -07:00
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ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
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rport->port_id);
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2007-07-10 23:08:19 -07:00
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if (ret) {
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device_del(&rport->dev);
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transport_destroy_device(&rport->dev);
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put_device(&rport->dev);
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return ERR_PTR(ret);
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}
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}
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2007-06-27 00:32:39 -07:00
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transport_add_device(&rport->dev);
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transport_configure_device(&rport->dev);
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return rport;
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}
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EXPORT_SYMBOL_GPL(srp_rport_add);
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/**
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2007-11-03 11:30:39 -07:00
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* srp_rport_del - remove a SRP remote port
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* @rport: SRP remote port to remove
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2007-06-27 00:32:39 -07:00
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*
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* Removes the specified SRP remote port.
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*/
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void srp_rport_del(struct srp_rport *rport)
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{
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struct device *dev = &rport->dev;
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2007-08-31 10:03:39 -07:00
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struct Scsi_Host *shost = dev_to_shost(dev->parent);
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2007-06-27 00:32:39 -07:00
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2007-08-31 10:03:39 -07:00
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if (shost->active_mode & MODE_TARGET &&
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rport->roles == SRP_RPORT_ROLE_INITIATOR)
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srp_tgt_it_nexus_destroy(shost, (unsigned long)rport);
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2007-07-10 23:08:19 -07:00
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2007-06-27 00:32:39 -07:00
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transport_remove_device(dev);
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device_del(dev);
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transport_destroy_device(dev);
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put_device(dev);
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}
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EXPORT_SYMBOL_GPL(srp_rport_del);
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static int do_srp_rport_del(struct device *dev, void *data)
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{
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2008-01-03 19:34:49 -07:00
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if (scsi_is_srp_rport(dev))
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srp_rport_del(dev_to_rport(dev));
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2007-06-27 00:32:39 -07:00
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return 0;
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}
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/**
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2007-11-03 11:30:39 -07:00
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* srp_remove_host - tear down a Scsi_Host's SRP data structures
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2007-06-27 00:32:39 -07:00
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* @shost: Scsi Host that is torn down
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*
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* Removes all SRP remote ports for a given Scsi_Host.
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* Must be called just before scsi_remove_host for SRP HBAs.
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*/
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void srp_remove_host(struct Scsi_Host *shost)
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{
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device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);
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}
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EXPORT_SYMBOL_GPL(srp_remove_host);
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2007-07-10 23:08:22 -07:00
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static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
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int result)
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2007-07-10 23:08:19 -07:00
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{
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struct srp_internal *i = to_srp_internal(shost->transportt);
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2007-07-10 23:08:22 -07:00
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return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
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}
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static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
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{
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struct srp_internal *i = to_srp_internal(shost->transportt);
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return i->f->it_nexus_response(shost, nexus, result);
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2007-07-10 23:08:19 -07:00
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}
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2007-06-27 00:32:39 -07:00
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/**
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2007-11-03 11:30:39 -07:00
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* srp_attach_transport - instantiate SRP transport template
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2007-06-27 00:32:39 -07:00
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* @ft: SRP transport class function template
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*/
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struct scsi_transport_template *
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srp_attach_transport(struct srp_function_template *ft)
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{
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int count;
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struct srp_internal *i;
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i = kzalloc(sizeof(*i), GFP_KERNEL);
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if (!i)
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return NULL;
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2007-07-10 23:08:22 -07:00
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i->t.tsk_mgmt_response = srp_tsk_mgmt_response;
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2007-07-10 23:08:19 -07:00
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i->t.it_nexus_response = srp_it_nexus_response;
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|
2007-06-27 00:32:39 -07:00
|
|
|
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;
|
|
|
|
|
|
|
|
count = 0;
|
2011-09-10 07:31:57 -07:00
|
|
|
i->rport_attrs[count++] = &dev_attr_port_id;
|
|
|
|
i->rport_attrs[count++] = &dev_attr_roles;
|
2011-09-16 11:41:13 -07:00
|
|
|
if (ft->rport_delete)
|
|
|
|
i->rport_attrs[count++] = &dev_attr_delete;
|
2011-09-10 07:31:57 -07:00
|
|
|
i->rport_attrs[count++] = NULL;
|
|
|
|
BUG_ON(count > ARRAY_SIZE(i->rport_attrs));
|
2007-06-27 00:32:39 -07:00
|
|
|
|
2011-10-21 10:31:07 -07:00
|
|
|
transport_container_register(&i->rport_attr_cont);
|
|
|
|
|
2007-06-27 00:32:39 -07:00
|
|
|
i->f = ft;
|
|
|
|
|
|
|
|
return &i->t;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(srp_attach_transport);
|
|
|
|
|
|
|
|
/**
|
2007-11-03 11:30:39 -07:00
|
|
|
* srp_release_transport - release SRP transport template instance
|
2007-06-27 00:32:39 -07:00
|
|
|
* @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);
|