diff options
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
| -rw-r--r-- | drivers/scsi/scsi_transport_iscsi.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c new file mode 100644 index 00000000000..8bb8222ea58 --- /dev/null +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -0,0 +1,388 @@ +/* + * iSCSI transport class definitions + * + * Copyright (C) IBM Corporation, 2004 + * Copyright (C) Mike Christie, 2004 + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ +#include <linux/module.h> +#include <scsi/scsi.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_iscsi.h> + +#define ISCSI_SESSION_ATTRS 20 +#define ISCSI_HOST_ATTRS 2 + +struct iscsi_internal { + struct scsi_transport_template t; + struct iscsi_function_template *fnt; + /* + * We do not have any private or other attrs. + */ + struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; + struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; +}; + +#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t) + +static DECLARE_TRANSPORT_CLASS(iscsi_transport_class, + "iscsi_transport", + NULL, + NULL, + NULL); + +static DECLARE_TRANSPORT_CLASS(iscsi_host_class, + "iscsi_host", + NULL, + NULL, + NULL); +/* + * iSCSI target and session attrs + */ +#define iscsi_session_show_fn(field, format) \ + \ +static ssize_t \ +show_session_##field(struct class_device *cdev, char *buf) \ +{ \ + struct scsi_target *starget = transport_class_to_starget(cdev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ + \ + if (i->fnt->get_##field) \ + i->fnt->get_##field(starget); \ + return snprintf(buf, 20, format"\n", iscsi_##field(starget)); \ +} + +#define iscsi_session_rd_attr(field, format) \ + iscsi_session_show_fn(field, format) \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL); + +iscsi_session_rd_attr(tpgt, "%hu"); +iscsi_session_rd_attr(tsih, "%2x"); +iscsi_session_rd_attr(max_recv_data_segment_len, "%u"); +iscsi_session_rd_attr(max_burst_len, "%u"); +iscsi_session_rd_attr(first_burst_len, "%u"); +iscsi_session_rd_attr(def_time2wait, "%hu"); +iscsi_session_rd_attr(def_time2retain, "%hu"); +iscsi_session_rd_attr(max_outstanding_r2t, "%hu"); +iscsi_session_rd_attr(erl, "%d"); + + +#define iscsi_session_show_bool_fn(field) \ + \ +static ssize_t \ +show_session_bool_##field(struct class_device *cdev, char *buf) \ +{ \ + struct scsi_target *starget = transport_class_to_starget(cdev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ + \ + if (i->fnt->get_##field) \ + i->fnt->get_##field(starget); \ + \ + if (iscsi_##field(starget)) \ + return sprintf(buf, "Yes\n"); \ + return sprintf(buf, "No\n"); \ +} + +#define iscsi_session_rd_bool_attr(field) \ + iscsi_session_show_bool_fn(field) \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_bool_##field, NULL); + +iscsi_session_rd_bool_attr(initial_r2t); +iscsi_session_rd_bool_attr(immediate_data); +iscsi_session_rd_bool_attr(data_pdu_in_order); +iscsi_session_rd_bool_attr(data_sequence_in_order); + +#define iscsi_session_show_digest_fn(field) \ + \ +static ssize_t \ +show_##field(struct class_device *cdev, char *buf) \ +{ \ + struct scsi_target *starget = transport_class_to_starget(cdev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ + \ + if (i->fnt->get_##field) \ + i->fnt->get_##field(starget); \ + \ + if (iscsi_##field(starget)) \ + return sprintf(buf, "CRC32C\n"); \ + return sprintf(buf, "None\n"); \ +} + +#define iscsi_session_rd_digest_attr(field) \ + iscsi_session_show_digest_fn(field) \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); + +iscsi_session_rd_digest_attr(header_digest); +iscsi_session_rd_digest_attr(data_digest); + +static ssize_t +show_port(struct class_device *cdev, char *buf) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); + + if (i->fnt->get_port) + i->fnt->get_port(starget); + + return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget))); +} +static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); + +static ssize_t +show_ip_address(struct class_device *cdev, char *buf) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); + + if (i->fnt->get_ip_address) + i->fnt->get_ip_address(starget); + + if (iscsi_addr_type(starget) == AF_INET) + return sprintf(buf, "%u.%u.%u.%u\n", + NIPQUAD(iscsi_sin_addr(starget))); + else if(iscsi_addr_type(starget) == AF_INET6) + return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", + NIP6(iscsi_sin6_addr(starget))); + return -EINVAL; +} +static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL); + +static ssize_t +show_isid(struct class_device *cdev, char *buf) +{ + struct scsi_target *starget = transport_class_to_starget(cdev); + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); + + if (i->fnt->get_isid) + i->fnt->get_isid(starget); + + return sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", + iscsi_isid(starget)[0], iscsi_isid(starget)[1], + iscsi_isid(starget)[2], iscsi_isid(starget)[3], + iscsi_isid(starget)[4], iscsi_isid(starget)[5]); +} +static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL); + +/* + * This is used for iSCSI names. Normally, we follow + * the transport class convention of having the lld + * set the field, but in these cases the value is + * too large. + */ +#define iscsi_session_show_str_fn(field) \ + \ +static ssize_t \ +show_session_str_##field(struct class_device *cdev, char *buf) \ +{ \ + ssize_t ret = 0; \ + struct scsi_target *starget = transport_class_to_starget(cdev); \ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ + \ + if (i->fnt->get_##field) \ + ret = i->fnt->get_##field(starget, buf, PAGE_SIZE); \ + return ret; \ +} + +#define iscsi_session_rd_str_attr(field) \ + iscsi_session_show_str_fn(field) \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_str_##field, NULL); + +iscsi_session_rd_str_attr(target_name); +iscsi_session_rd_str_attr(target_alias); + +/* + * iSCSI host attrs + */ + +/* + * Again, this is used for iSCSI names. Normally, we follow + * the transport class convention of having the lld set + * the field, but in these cases the value is too large. + */ +#define iscsi_host_show_str_fn(field) \ + \ +static ssize_t \ +show_host_str_##field(struct class_device *cdev, char *buf) \ +{ \ + int ret = 0; \ + struct Scsi_Host *shost = transport_class_to_shost(cdev); \ + struct iscsi_internal *i = to_iscsi_internal(shost->transportt); \ + \ + if (i->fnt->get_##field) \ + ret = i->fnt->get_##field(shost, buf, PAGE_SIZE); \ + return ret; \ +} + +#define iscsi_host_rd_str_attr(field) \ + iscsi_host_show_str_fn(field) \ +static CLASS_DEVICE_ATTR(field, S_IRUGO, show_host_str_##field, NULL); + +iscsi_host_rd_str_attr(initiator_name); +iscsi_host_rd_str_attr(initiator_alias); + +#define SETUP_SESSION_RD_ATTR(field) \ + if (i->fnt->show_##field) { \ + i->session_attrs[count] = &class_device_attr_##field; \ + count++; \ + } + +#define SETUP_HOST_RD_ATTR(field) \ + if (i->fnt->show_##field) { \ + i->host_attrs[count] = &class_device_attr_##field; \ + count++; \ + } + +static int iscsi_host_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct iscsi_internal *i; + + if (!scsi_is_host_device(dev)) + return 0; + + shost = dev_to_shost(dev); + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &iscsi_host_class.class) + return 0; + + i = to_iscsi_internal(shost->transportt); + + return &i->t.host_attrs.ac == cont; +} + +static int iscsi_target_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct iscsi_internal *i; + + if (!scsi_is_target_device(dev)) + return 0; + + shost = dev_to_shost(dev->parent); + if (!shost->transportt || shost->transportt->host_attrs.ac.class + != &iscsi_host_class.class) + return 0; + + i = to_iscsi_internal(shost->transportt); + + return &i->t.target_attrs.ac == cont; +} + +struct scsi_transport_template * +iscsi_attach_transport(struct iscsi_function_template *fnt) +{ + struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal), + GFP_KERNEL); + int count = 0; + + if (unlikely(!i)) + return NULL; + + memset(i, 0, sizeof(struct iscsi_internal)); + i->fnt = fnt; + + i->t.target_attrs.ac.attrs = &i->session_attrs[0]; + i->t.target_attrs.ac.class = &iscsi_transport_class.class; + i->t.target_attrs.ac.match = iscsi_target_match; + transport_container_register(&i->t.target_attrs); + i->t.target_size = sizeof(struct iscsi_class_session); + + SETUP_SESSION_RD_ATTR(tsih); + SETUP_SESSION_RD_ATTR(isid); + SETUP_SESSION_RD_ATTR(header_digest); + SETUP_SESSION_RD_ATTR(data_digest); + SETUP_SESSION_RD_ATTR(target_name); + SETUP_SESSION_RD_ATTR(target_alias); + SETUP_SESSION_RD_ATTR(port); + SETUP_SESSION_RD_ATTR(tpgt); + SETUP_SESSION_RD_ATTR(ip_address); + SETUP_SESSION_RD_ATTR(initial_r2t); + SETUP_SESSION_RD_ATTR(immediate_data); + SETUP_SESSION_RD_ATTR(max_recv_data_segment_len); + SETUP_SESSION_RD_ATTR(max_burst_len); + SETUP_SESSION_RD_ATTR(first_burst_len); + SETUP_SESSION_RD_ATTR(def_time2wait); + SETUP_SESSION_RD_ATTR(def_time2retain); + SETUP_SESSION_RD_ATTR(max_outstanding_r2t); + SETUP_SESSION_RD_ATTR(data_pdu_in_order); + SETUP_SESSION_RD_ATTR(data_sequence_in_order); + SETUP_SESSION_RD_ATTR(erl); + + BUG_ON(count > ISCSI_SESSION_ATTRS); + i->session_attrs[count] = NULL; + + i->t.host_attrs.ac.attrs = &i->host_attrs[0]; + i->t.host_attrs.ac.class = &iscsi_host_class.class; + i->t.host_attrs.ac.match = iscsi_host_match; + transport_container_register(&i->t.host_attrs); + i->t.host_size = 0; + + count = 0; + SETUP_HOST_RD_ATTR(initiator_name); + SETUP_HOST_RD_ATTR(initiator_alias); + + BUG_ON(count > ISCSI_HOST_ATTRS); + i->host_attrs[count] = NULL; + + return &i->t; +} + +EXPORT_SYMBOL(iscsi_attach_transport); + +void iscsi_release_transport(struct scsi_transport_template *t) +{ + struct iscsi_internal *i = to_iscsi_internal(t); + + transport_container_unregister(&i->t.target_attrs); + transport_container_unregister(&i->t.host_attrs); + + kfree(i); +} + +EXPORT_SYMBOL(iscsi_release_transport); + +static __init int iscsi_transport_init(void) +{ + int err = transport_class_register(&iscsi_transport_class); + + if (err) + return err; + return transport_class_register(&iscsi_host_class); +} + +static void __exit iscsi_transport_exit(void) +{ + transport_class_unregister(&iscsi_host_class); + transport_class_unregister(&iscsi_transport_class); +} + +module_init(iscsi_transport_init); +module_exit(iscsi_transport_exit); + +MODULE_AUTHOR("Mike Christie"); +MODULE_DESCRIPTION("iSCSI Transport Attributes"); +MODULE_LICENSE("GPL"); |