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[SCSI] add srp transport class
This adds srp transport class that works with ib_srp and ibmvscsi.
It creates only /sys/class/{srp_host,srp_remote_ports} and
srp_remote_ports has only "port_id" attribute.
viola:/sys/class/srp_remote_ports/port-0:1# ls
device port_id subsystem uevent
viola:/sys/class/srp_remote_ports/port-0:1# cat port_id
4c:49:4e:55:58:20:56:49:4f:00:00:00:00:00:00:00
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori
James Bottomley
parent
604cd794de
commit
09345f6505
@ -289,6 +289,13 @@ config SCSI_SAS_ATTRS
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source "drivers/scsi/libsas/Kconfig"
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config SCSI_SRP_ATTRS
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tristate "SRP Transport Attributes"
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depends on SCSI
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help
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If you wish to export transport-specific information about
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each attached SRP device to sysfs, say Y.
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endmenu
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menuconfig SCSI_LOWLEVEL
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@ -34,6 +34,7 @@ obj-$(CONFIG_SCSI_FC_ATTRS) += scsi_transport_fc.o
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obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o
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obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o
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obj-$(CONFIG_SCSI_SAS_LIBSAS) += libsas/
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obj-$(CONFIG_SCSI_SRP_ATTRS) += scsi_transport_srp.o
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obj-$(CONFIG_ISCSI_TCP) += libiscsi.o iscsi_tcp.o
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obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
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320
drivers/scsi/scsi_transport_srp.c
Normal file
320
drivers/scsi/scsi_transport_srp.c
Normal file
@ -0,0 +1,320 @@
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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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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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#define SRP_RPORT_ATTRS 3
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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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struct class_device_attribute *host_attrs[SRP_HOST_ATTRS + 1];
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struct class_device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];
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struct class_device_attribute private_rport_attrs[SRP_RPORT_ATTRS];
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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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#define transport_class_to_srp_rport(cdev) dev_to_rport((cdev)->dev)
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static int srp_host_setup(struct transport_container *tc, struct device *dev,
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struct class_device *cdev)
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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 SETUP_TEMPLATE(attrb, field, perm, test, ro_test, ro_perm) \
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i->private_##attrb[count] = class_device_attr_##field; \
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i->private_##attrb[count].attr.mode = perm; \
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if (ro_test) { \
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i->private_##attrb[count].attr.mode = ro_perm; \
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i->private_##attrb[count].store = NULL; \
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} \
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i->attrb[count] = &i->private_##attrb[count]; \
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if (test) \
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count++
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#define SETUP_RPORT_ATTRIBUTE_RD(field) \
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SETUP_TEMPLATE(rport_attrs, field, S_IRUGO, 1, 0, 0)
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#define SETUP_RPORT_ATTRIBUTE_RW(field) \
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SETUP_TEMPLATE(rport_attrs, field, S_IRUGO | S_IWUSR, \
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1, 1, S_IRUGO)
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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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show_srp_rport_id(struct class_device *cdev, char *buf)
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{
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struct srp_rport *rport = transport_class_to_srp_rport(cdev);
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return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport));
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}
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static CLASS_DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);
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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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*
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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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* publishes a port to the rest of the system
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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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id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);
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sprintf(rport->dev.bus_id, "port-%d:%d", shost->host_no, id);
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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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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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* srp_rport_del -- remove a SRP remote port
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* @port: SRP remote port to remove
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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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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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srp_rport_del(dev_to_rport(dev));
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return 0;
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}
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/**
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* srp_remove_host -- tear down a Scsi_Host's SRP data structures
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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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/**
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* srp_attach_transport -- instantiate SRP transport template
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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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i->t.host_size = sizeof(struct srp_host_attrs);
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i->t.host_attrs.ac.attrs = &i->host_attrs[0];
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i->t.host_attrs.ac.class = &srp_host_class.class;
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i->t.host_attrs.ac.match = srp_host_match;
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i->host_attrs[0] = NULL;
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transport_container_register(&i->t.host_attrs);
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i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
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i->rport_attr_cont.ac.class = &srp_rport_class.class;
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i->rport_attr_cont.ac.match = srp_rport_match;
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transport_container_register(&i->rport_attr_cont);
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count = 0;
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SETUP_RPORT_ATTRIBUTE_RD(port_id);
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i->rport_attrs[count] = NULL;
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i->f = ft;
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return &i->t;
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}
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EXPORT_SYMBOL_GPL(srp_attach_transport);
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/**
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* srp_release_transport -- release SRP transport template instance
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* @t: transport template instance
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*/
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void srp_release_transport(struct scsi_transport_template *t)
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{
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struct srp_internal *i = to_srp_internal(t);
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transport_container_unregister(&i->t.host_attrs);
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transport_container_unregister(&i->rport_attr_cont);
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kfree(i);
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}
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EXPORT_SYMBOL_GPL(srp_release_transport);
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static __init int srp_transport_init(void)
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{
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int ret;
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ret = transport_class_register(&srp_host_class);
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if (ret)
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return ret;
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ret = transport_class_register(&srp_rport_class);
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if (ret)
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goto unregister_host_class;
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return 0;
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unregister_host_class:
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transport_class_unregister(&srp_host_class);
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return ret;
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}
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static void __exit srp_transport_exit(void)
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{
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transport_class_unregister(&srp_host_class);
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transport_class_unregister(&srp_rport_class);
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}
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MODULE_AUTHOR("FUJITA Tomonori");
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MODULE_DESCRIPTION("SRP Transport Attributes");
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MODULE_LICENSE("GPL");
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module_init(srp_transport_init);
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module_exit(srp_transport_exit);
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32
include/scsi/scsi_transport_srp.h
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32
include/scsi/scsi_transport_srp.h
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@ -0,0 +1,32 @@
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#ifndef SCSI_TRANSPORT_SRP_H
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#define SCSI_TRANSPORT_SRP_H
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#include <linux/transport_class.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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struct srp_rport_identifiers {
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u8 port_id[16];
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};
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struct srp_rport {
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struct device dev;
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u8 port_id[16];
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};
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struct srp_function_template {
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/* later */
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};
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extern struct scsi_transport_template *
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srp_attach_transport(struct srp_function_template *);
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extern void srp_release_transport(struct scsi_transport_template *);
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extern struct srp_rport *srp_rport_add(struct Scsi_Host *,
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struct srp_rport_identifiers *);
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extern void srp_rport_del(struct srp_rport *);
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extern void srp_remove_host(struct Scsi_Host *);
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#endif
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