[PATCH 3/3] add open iscsi netlink interface to iscsi transport class

Mike Christie
2005-05-15T19:43:59Z

incorporate the open-iscsi/linux-iscsi netlink interface
into the iscsi transport class.

See here for details on the sysfs layout
http://marc.theaimsgroup.com/?l=linux-kernel&m=111526269831567&w=2

diff -aurp linux-2.6.12-rc4/drivers/scsi/scsi_transport_iscsi.c linux-2.6.12-rc4.work/drivers/scsi/scsi_transport_iscsi.c
--- linux-2.6.12-rc4/drivers/scsi/scsi_transport_iscsi.c 2005-05-06 22:20:31.000000000 -0700
+++ linux-2.6.12-rc4.work/drivers/scsi/scsi_transport_iscsi.c 2005-05-14 12:20:22.000000000 -0700
@@ -1,8 +1,10 @@
-/*
+/*
* iSCSI transport class definitions
*
* Copyright (C) IBM Corporation, 2004
- * Copyright (C) Mike Christie, 2004
+ * Copyright (C) Mike Christie, 2004 - 2005
+ * Copyright (C) Dmitry Yusupov, 2004 - 2005
+ * Copyright (C) Alex Aizman, 2004 - 2005
*
* 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
@@ -19,370 +21,1189 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/module.h>
+#include <linux/mempool.h>
+#include <net/tcp.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>
+#include <scsi/iscsi_ifev.h>

-#define ISCSI_SESSION_ATTRS 20
-#define ISCSI_HOST_ATTRS 2
+#define ISCSI_SESSION_ATTRS 8
+#define ISCSI_CONN_ATTRS 6

struct iscsi_internal {
struct scsi_transport_template t;
- struct iscsi_function_template *fnt;
+ struct iscsi_transport *iscsi_transport;
+ struct list_head list;
+ /*
+ * List of sessions for this transport
+ */
+ struct list_head sessions;
+ /*
+ * lock to serialize access to the sessions list which must
+ * be taken after the rx_queue_sema
+ */
+ spinlock_t session_lock;
+ /*
+ * based on transport capabilities, at register time we sets these
+ * bits to tell the transport class it wants the attributes
+ * displayed in sysfs.
+ */
+ uint32_t param_mask;
+
/*
* We do not have any private or other attrs.
*/
+ struct transport_container conn_cont;
+ struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
+ struct transport_container session_cont;
struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
- struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
};

+/*
+ * list of registered transports and lock that must
+ * be held while accessing list. The iscsi_transport_lock must
+ * be acquired after the rx_queue_sema.
+ */
+static LIST_HEAD(iscsi_transports);
+static DEFINE_SPINLOCK(iscsi_transport_lock);
+
#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t)

-static DECLARE_TRANSPORT_CLASS(iscsi_transport_class,
- "iscsi_transport",
+static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
+ "iscsi_session",
NULL,
NULL,
NULL);

-static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
- "iscsi_host",
+static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
+ "iscsi_connection",
NULL,
NULL,
NULL);
+
+static struct sock *nls;
+static int daemon_pid;
+static DECLARE_MUTEX(rx_queue_sema);
+
+struct mempool_zone {
+ mempool_t *pool;
+ atomic_t allocated;
+ int size;
+ int hiwat;
+ struct list_head freequeue;
+ spinlock_t freelock;
+};
+
+static struct mempool_zone z_reply;
+
/*
- * iSCSI target and session attrs
+ * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
+ * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
+ * so daemon will notice OOM on NETLINK tranposrt level and will
+ * be able to predict or change operational behavior
*/
-#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 Z_MAX_REPLY 8
+#define Z_HIWAT_REPLY 6
+#define Z_MAX_PDU 8
+#define Z_HIWAT_PDU 6
+#define Z_MAX_ERROR 16
+#define Z_HIWAT_ERROR 12
+
+struct iscsi_if_conn {
+ struct list_head conn_list; /* item in connlist */
+ struct list_head session_list; /* item in session->connections */
+ iscsi_connh_t connh;
+ int active; /* must be accessed with the connlock */
+ struct Scsi_Host *host; /* originated shost */
+ struct device dev; /* sysfs transport/container device */
+ struct iscsi_transport *transport;
+ struct mempool_zone z_error;
+ struct mempool_zone z_pdu;
+ struct list_head freequeue;
+};

+#define iscsi_dev_to_if_conn(_dev) \
+ container_of(_dev, struct iscsi_if_conn, dev)

-#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_cdev_to_if_conn(_cdev) \
+ iscsi_dev_to_if_conn(_cdev->dev)
+
+static LIST_HEAD(connlist);
+static DEFINE_SPINLOCK(connlock);
+
+struct iscsi_if_session {
+ struct list_head list; /* item in session_list */
+ struct list_head connections;
+ iscsi_sessionh_t sessionh;
+ struct iscsi_transport *transport;
+ struct device dev; /* sysfs transport/container device */
+};
+
+#define iscsi_dev_to_if_session(_dev) \
+ container_of(_dev, struct iscsi_if_session, dev)
+
+#define iscsi_cdev_to_if_session(_cdev) \
+ iscsi_dev_to_if_session(_cdev->dev)
+
+#define iscsi_if_session_to_shost(_session) \
+ dev_to_shost(_session->dev.parent)
+
+static struct iscsi_if_conn*
+iscsi_if_find_conn(uint64_t key)
+{
+ unsigned long flags;
+ struct iscsi_if_conn *conn;
+
+ spin_lock_irqsave(&connlock, flags);
+ list_for_each_entry(conn, &connlist, conn_list)
+ if (conn->connh == key) {
+ spin_unlock_irqrestore(&connlock, flags);
+ return conn;
+ }
+ spin_unlock_irqrestore(&connlock, flags);
+ return NULL;
}

-#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);
+static struct iscsi_internal *
+iscsi_if_transport_lookup(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;

-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);
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_for_each_entry(priv, &iscsi_transports, list)
+ if (tt == priv->iscsi_transport) {
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+ return priv;
+ }
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+ return NULL;
+}

-#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"); \
+static inline struct list_head *skb_to_lh(struct sk_buff *skb)
+{
+ return (struct list_head *)&skb->cb;
}

-#define iscsi_session_rd_digest_attr(field) \
- iscsi_session_show_digest_fn(field) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
+static void*
+mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data)
+{
+ struct mempool_zone *zone = pool_data;

-iscsi_session_rd_digest_attr(header_digest);
-iscsi_session_rd_digest_attr(data_digest);
+ return alloc_skb(zone->size, gfp_mask);
+}

-static ssize_t
-show_port(struct class_device *cdev, char *buf)
+static void
+mempool_zone_free_skb(void *element, void *pool_data)
{
- 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);
+ kfree_skb(element);
+}

- if (i->fnt->get_port)
- i->fnt->get_port(starget);
+static void
+mempool_zone_complete(struct mempool_zone *zone)
+{
+ unsigned long flags;
+ struct list_head *lh, *n;

- return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget)));
+ spin_lock_irqsave(&zone->freelock, flags);
+ list_for_each_safe(lh, n, &zone->freequeue) {
+ struct sk_buff *skb = (struct sk_buff *)((char *)lh -
+ offsetof(struct sk_buff, cb));
+ if (!skb_shared(skb)) {
+ list_del(skb_to_lh(skb));
+ mempool_free(skb, zone->pool);
+ atomic_dec(&zone->allocated);
+ }
+ }
+ spin_unlock_irqrestore(&zone->freelock, flags);
}
-static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);

-static ssize_t
-show_ip_address(struct class_device *cdev, char *buf)
+static int
+mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size,
+ unsigned hiwat)
{
- 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);
+ zp->pool = mempool_create(max, mempool_zone_alloc_skb,
+ mempool_zone_free_skb, zp);
+ if (!zp->pool)
+ return -ENOMEM;
+
+ zp->size = size;
+ zp->hiwat = hiwat;
+
+ INIT_LIST_HEAD(&zp->freequeue);
+ spin_lock_init(&zp->freelock);
+ atomic_set(&zp->allocated, 0);
+
+ return 0;
+}

- 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 struct sk_buff*
+mempool_zone_get_skb(struct mempool_zone *zone)
+{
+ struct sk_buff *skb;
+
+ skb = mempool_alloc(zone->pool, GFP_ATOMIC);
+ if (skb)
+ atomic_inc(&zone->allocated);
+ return skb;
}
-static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL);

-static ssize_t
-show_isid(struct class_device *cdev, char *buf)
+static int
+iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb)
{
- 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);
+ unsigned long flags;
+ int rc;
+
+ skb_get(skb);
+ rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
+ if (rc < 0) {
+ mempool_free(skb, zone->pool);
+ printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
+ return rc;
+ }

- if (i->fnt->get_isid)
- i->fnt->get_isid(starget);
+ spin_lock_irqsave(&zone->freelock, flags);
+ list_add(skb_to_lh(skb), &zone->freequeue);
+ spin_unlock_irqrestore(&zone->freelock, flags);

- 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]);
+ return 0;
}
-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; \
+int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ struct iscsi_if_conn *conn;
+ char *pdu;
+ int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
+ data_size);
+
+ conn = iscsi_if_find_conn(connh);
+ BUG_ON(!conn);
+
+ mempool_zone_complete(&conn->z_pdu);
+
+ skb = mempool_zone_get_skb(&conn->z_pdu);
+ if (!skb) {
+ iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED);
+ printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n",
+ conn->host->host_no);
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)));
+ ev = NLMSG_DATA(nlh);
+ memset(ev, 0, sizeof(*ev));
+ ev->transport_handle = iscsi_handle(conn->transport);
+ ev->type = ISCSI_KEVENT_RECV_PDU;
+ if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
+ ev->iferror = -ENOMEM;
+ ev->r.recv_req.conn_handle = connh;
+ pdu = (char*)ev + sizeof(*ev);
+ memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
+ memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
+
+ return iscsi_unicast_skb(&conn->z_pdu, skb);
}
+EXPORT_SYMBOL_GPL(iscsi_recv_pdu);

-#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);
+void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ struct iscsi_if_conn *conn;
+ int len = NLMSG_SPACE(sizeof(*ev));
+
+ conn = iscsi_if_find_conn(connh);
+ BUG_ON(!conn);
+
+ mempool_zone_complete(&conn->z_error);
+
+ skb = mempool_zone_get_skb(&conn->z_error);
+ if (!skb) {
+ printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n",
+ conn->host->host_no, error);
+ return;
+ }
+
+ nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)));
+ ev = NLMSG_DATA(nlh);
+ ev->transport_handle = iscsi_handle(conn->transport);
+ ev->type = ISCSI_KEVENT_CONN_ERROR;
+ if (atomic_read(&conn->z_error.allocated) >= conn->z_error.hiwat)
+ ev->iferror = -ENOMEM;
+ ev->r.connerror.error = error;
+ ev->r.connerror.conn_handle = connh;

-iscsi_session_rd_str_attr(target_name);
-iscsi_session_rd_str_attr(target_alias);
+ iscsi_unicast_skb(&conn->z_error, skb);
+
+ printk(KERN_INFO "iscsi%d: detected conn error (%d)\n",
+ conn->host->host_no, error);
+}
+EXPORT_SYMBOL_GPL(iscsi_conn_error);
+
+static int
+iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
+ void *payload, int size)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ int len = NLMSG_SPACE(size);
+ int flags = multi ? NLM_F_MULTI : 0;
+ int t = done ? NLMSG_DONE : type;
+
+ mempool_zone_complete(&z_reply);
+
+ skb = mempool_zone_get_skb(&z_reply);
+ /*
+ * FIXME:
+ * user is supposed to react on iferror == -ENOMEM;
+ * see iscsi_if_rx().
+ */
+ BUG_ON(!skb);
+
+ nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)));
+ nlh->nlmsg_flags = flags;
+ memcpy(NLMSG_DATA(nlh), payload, size);
+ return iscsi_unicast_skb(&z_reply, skb);
+}

/*
- * iSCSI host attrs
+ * iSCSI Session's hostdata organization:
+ *
+ * *------------------* <== host->hostdata
+ * | transport |
+ * |------------------| <== iscsi_hostdata(host->hostdata)
+ * | transport's data |
+ * |------------------| <== hostdata_session(host->hostdata)
+ * | interface's data |
+ * *------------------*
*/

+#define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \
+ _t->hostdata_size % sizeof(unsigned long) + \
+ sizeof(struct iscsi_if_session))
+
+#define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \
+ ((struct iscsi_transport *) \
+ iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size)
+
+static void iscsi_if_session_dev_release(struct device *dev)
+{
+ struct iscsi_if_session *session = iscsi_dev_to_if_session(dev);
+ struct iscsi_transport *transport = session->transport;
+ struct Scsi_Host *shost = iscsi_if_session_to_shost(session);
+ struct iscsi_if_conn *conn, *tmp;
+ unsigned long flags;
+
+ /* now free connections */
+ spin_lock_irqsave(&connlock, flags);
+ list_for_each_entry_safe(conn, tmp, &session->connections,
+ session_list) {
+ list_del(&conn->session_list);
+ mempool_destroy(conn->z_pdu.pool);
+ mempool_destroy(conn->z_error.pool);
+ kfree(conn);
+ }
+ spin_unlock_irqrestore(&connlock, flags);
+ scsi_host_put(shost);
+ module_put(transport->owner);
+}
+
+static int
+iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
+{
+ struct iscsi_transport *transport = priv->iscsi_transport;
+ struct iscsi_if_session *session;
+ struct Scsi_Host *shost;
+ unsigned long flags;
+ int error;
+
+ if (!try_module_get(transport->owner))
+ return -EPERM;
+
+ shost = scsi_host_alloc(transport->host_template,
+ hostdata_privsize(transport));
+ if (!shost) {
+ ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
+ printk(KERN_ERR "iscsi: can not allocate SCSI host for "
+ "session\n");
+ error = -ENOMEM;
+ goto out_module_put;
+ }
+ shost->max_id = 1;
+ shost->max_channel = 0;
+ shost->max_lun = transport->max_lun;
+ shost->max_cmd_len = transport->max_cmd_len;
+ shost->transportt = &priv->t;
+
+ /* store struct iscsi_transport in hostdata */
+ *(uint64_t*)shost->hostdata = ev->transport_handle;
+
+ ev->r.c_session_ret.session_handle = transport->create_session(
+ ev->u.c_session.initial_cmdsn, shost);
+ if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) {
+ error = 0;
+ goto out_host_put;
+ }
+
+ /* host_no becomes assigned SID */
+ ev->r.c_session_ret.sid = shost->host_no;
+ /* initialize session */
+ session = hostdata_session(shost->hostdata);
+ INIT_LIST_HEAD(&session->connections);
+ INIT_LIST_HEAD(&session->list);
+ session->sessionh = ev->r.c_session_ret.session_handle;
+ session->transport = transport;
+
+ error = scsi_add_host(shost, NULL);
+ if (error)
+ goto out_destroy_session;
+
+ /*
+ * this is released in the dev's release function)
+ */
+ scsi_host_get(shost);
+ snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no);
+ session->dev.parent = &shost->shost_gendev;
+ session->dev.release = iscsi_if_session_dev_release;
+ error = device_register(&session->dev);
+ if (error) {
+ printk(KERN_ERR "iscsi: could not register session%d's dev\n",
+ shost->host_no);
+ goto out_remove_host;
+ }
+ transport_register_device(&session->dev);
+
+ /* add this session to the list of active sessions */
+ spin_lock_irqsave(&priv->session_lock, flags);
+ list_add(&session->list, &priv->sessions);
+ spin_unlock_irqrestore(&priv->session_lock, flags);
+
+ return 0;
+
+ out_remove_host:
+ scsi_remove_host(shost);
+ out_destroy_session:
+ transport->destroy_session(ev->r.c_session_ret.session_handle);
+ ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
+ out_host_put:
+ scsi_host_put(shost);
+ out_module_put:
+ module_put(transport->owner);
+ return error;
+}
+
+static int
+iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
+{
+ struct iscsi_transport *transport = priv->iscsi_transport;
+ struct Scsi_Host *shost;
+ struct iscsi_if_session *session;
+ unsigned long flags;
+ struct iscsi_if_conn *conn;
+ int error = 0;
+
+ shost = scsi_host_lookup(ev->u.d_session.sid);
+ if (shost == ERR_PTR(-ENXIO))
+ return -EEXIST;
+ session = hostdata_session(shost->hostdata);
+
+ /* check if we have active connections */
+ spin_lock_irqsave(&connlock, flags);
+ list_for_each_entry(conn, &session->connections, session_list) {
+ if (conn->active) {
+ printk(KERN_ERR "iscsi%d: can not destroy session: "
+ "has active connection (%p)\n",
+ shost->host_no, iscsi_ptr(conn->connh));
+ spin_unlock_irqrestore(&connlock, flags);
+ error = EIO;
+ goto out_release_ref;
+ }
+ }
+ spin_unlock_irqrestore(&connlock, flags);
+
+ scsi_remove_host(shost);
+ transport->destroy_session(ev->u.d_session.session_handle);
+ transport_unregister_device(&session->dev);
+ device_unregister(&session->dev);
+
+ /* remove this session from the list of active sessions */
+ spin_lock_irqsave(&priv->session_lock, flags);
+ list_del(&session->list);
+ spin_unlock_irqrestore(&priv->session_lock, flags);
+
+ /* ref from host alloc */
+ scsi_host_put(shost);
+ out_release_ref:
+ /* ref from host lookup */
+ scsi_host_put(shost);
+ return error;
+}
+
+static void iscsi_if_conn_dev_release(struct device *dev)
+{
+ struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev);
+ struct Scsi_Host *shost = conn->host;
+
+ scsi_host_put(shost);
+}
+
+static int
+iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct iscsi_if_session *session;
+ struct Scsi_Host *shost;
+ struct iscsi_if_conn *conn;
+ unsigned long flags;
+ int error;
+
+ shost = scsi_host_lookup(ev->u.c_conn.sid);
+ if (shost == ERR_PTR(-ENXIO))
+ return -EEXIST;
+ session = hostdata_session(shost->hostdata);
+
+ conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL);
+ if (!conn) {
+ error = -ENOMEM;
+ goto out_release_ref;
+ }
+ memset(conn, 0, sizeof(struct iscsi_if_conn));
+ INIT_LIST_HEAD(&conn->session_list);
+ INIT_LIST_HEAD(&conn->conn_list);
+ conn->host = shost;
+ conn->transport = transport;
+
+ error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU,
+ NLMSG_SPACE(sizeof(struct iscsi_uevent) +
+ sizeof(struct iscsi_hdr) +
+ DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
+ Z_HIWAT_PDU);
+ if (error) {
+ printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new "
+ "conn\n", shost->host_no);
+ goto out_free_conn;
+ }
+ error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR,
+ NLMSG_SPACE(sizeof(struct iscsi_uevent)),
+ Z_HIWAT_ERROR);
+ if (error) {
+ printk(KERN_ERR "iscsi%d: can not allocate error zone for "
+ "new conn\n", shost->host_no);
+ goto out_free_pdu_pool;
+ }
+
+ ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle,
+ ev->u.c_conn.cid);
+ if (!ev->r.handle) {
+ error = -ENODEV;
+ goto out_free_error_pool;
+ }
+
+ conn->connh = ev->r.handle;
+
+ /*
+ * this is released in the dev's release function
+ */
+ if (!scsi_host_get(shost))
+ goto out_destroy_conn;
+ snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
+ shost->host_no, ev->u.c_conn.cid);
+ conn->dev.parent = &session->dev;
+ conn->dev.release = iscsi_if_conn_dev_release;
+ error = device_register(&conn->dev);
+ if (error) {
+ printk(KERN_ERR "iscsi%d: could not register connections%u "
+ "dev\n", shost->host_no, ev->u.c_conn.cid);
+ goto out_release_parent_ref;
+ }
+ transport_register_device(&conn->dev);
+
+ spin_lock_irqsave(&connlock, flags);
+ list_add(&conn->conn_list, &connlist);
+ list_add(&conn->session_list, &session->connections);
+ conn->active = 1;
+ spin_unlock_irqrestore(&connlock, flags);
+
+ scsi_host_put(shost);
+ return 0;
+
+ out_release_parent_ref:
+ scsi_host_put(shost);
+ out_destroy_conn:
+ transport->destroy_conn(ev->r.handle);
+ out_free_error_pool:
+ mempool_destroy(conn->z_error.pool);
+ out_free_pdu_pool:
+ mempool_destroy(conn->z_pdu.pool);
+ out_free_conn:
+ kfree(conn);
+ out_release_ref:
+ scsi_host_put(shost);
+ return error;
+}
+
+static int
+iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ unsigned long flags;
+ struct iscsi_if_conn *conn;
+
+ conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle);
+ if (!conn)
+ return -EEXIST;
+
+ transport->destroy_conn(ev->u.d_conn.conn_handle);
+
+ spin_lock_irqsave(&connlock, flags);
+ conn->active = 0;
+ list_del(&conn->conn_list);
+ spin_unlock_irqrestore(&connlock, flags);
+
+ transport_unregister_device(&conn->dev);
+ device_unregister(&conn->dev);
+ return 0;
+}
+
+static int
+iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb,
+ struct nlmsghdr *nlh)
+{
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+ struct iscsi_stats *stats;
+ struct sk_buff *skbstat;
+ struct iscsi_if_conn *conn;
+ struct nlmsghdr *nlhstat;
+ struct iscsi_uevent *evstat;
+ int len = NLMSG_SPACE(sizeof(*ev) +
+ sizeof(struct iscsi_stats) +
+ sizeof(struct iscsi_stats_custom) *
+ ISCSI_STATS_CUSTOM_MAX);
+ int err = 0;
+
+ conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle);
+ if (!conn)
+ return -EEXIST;
+
+ do {
+ int actual_size;
+
+ mempool_zone_complete(&conn->z_pdu);
+
+ skbstat = mempool_zone_get_skb(&conn->z_pdu);
+ if (!skbstat) {
+ printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n",
+ conn->host->host_no);
+ return -ENOMEM;
+ }
+
+ nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0,
+ (len - sizeof(*nlhstat)));
+ evstat = NLMSG_DATA(nlhstat);
+ memset(evstat, 0, sizeof(*evstat));
+ evstat->transport_handle = iscsi_handle(conn->transport);
+ evstat->type = nlh->nlmsg_type;
+ if (atomic_read(&conn->z_pdu.allocated) >= conn->z_pdu.hiwat)
+ evstat->iferror = -ENOMEM;
+ evstat->u.get_stats.conn_handle =
+ ev->u.get_stats.conn_handle;
+ stats = (struct iscsi_stats *)
+ ((char*)evstat + sizeof(*evstat));
+ memset(stats, 0, sizeof(*stats));
+
+ transport->get_stats(ev->u.get_stats.conn_handle, stats);
+ actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
+ sizeof(struct iscsi_stats) +
+ sizeof(struct iscsi_stats_custom) *
+ stats->custom_length);
+ actual_size -= sizeof(*nlhstat);
+ actual_size = NLMSG_LENGTH(actual_size);
+ skb_trim(skb, NLMSG_ALIGN(actual_size));
+ nlhstat->nlmsg_len = actual_size;
+
+ err = iscsi_unicast_skb(&conn->z_pdu, skbstat);
+ } while (err < 0 && err != -ECONNREFUSED);
+
+ return err;
+}
+
+static int
+iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ int err = 0;
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+ struct iscsi_transport *transport = NULL;
+ struct iscsi_internal *priv;
+
+ if (NETLINK_CREDS(skb)->uid)
+ return -EPERM;
+
+ priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
+ if (priv)
+ transport = priv->iscsi_transport;
+ else if (nlh->nlmsg_type != ISCSI_UEVENT_TRANS_LIST)
+ return -EEXIST;
+
+ daemon_pid = NETLINK_CREDS(skb)->pid;
+
+ switch (nlh->nlmsg_type) {
+ case ISCSI_UEVENT_TRANS_LIST: {
+ unsigned long flags;
+
+ /*
+ * this will always succeed for now since there
+ * is only one transport. We can kill this event
+ * and just export the info in sysfs when we settle
+ * the iscsi sysfs layout debate
+ */
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_for_each_entry(priv, &iscsi_transports, list) {
+ ev->r.t_list.elements[0].trans_handle =
+ iscsi_handle(priv->iscsi_transport);
+ strncpy(ev->r.t_list.elements[0].name,
+ priv->iscsi_transport->name,
+ ISCSI_TRANSPORT_NAME_MAXLEN);
+ }
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+
+ } break;
+ case ISCSI_UEVENT_CREATE_SESSION:
+ err = iscsi_if_create_session(priv, ev);
+ break;
+ case ISCSI_UEVENT_DESTROY_SESSION:
+ err = iscsi_if_destroy_session(priv, ev);
+ break;
+ case ISCSI_UEVENT_CREATE_CONN:
+ err = iscsi_if_create_conn(transport, ev);
+ break;
+ case ISCSI_UEVENT_DESTROY_CONN:
+ err = iscsi_if_destroy_conn(transport, ev);
+ break;
+ case ISCSI_UEVENT_BIND_CONN:
+ if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle))
+ return -EEXIST;
+ ev->r.retcode = transport->bind_conn(
+ ev->u.b_conn.session_handle,
+ ev->u.b_conn.conn_handle,
+ ev->u.b_conn.transport_fd,
+ ev->u.b_conn.is_leading);
+ break;
+ case ISCSI_UEVENT_SET_PARAM:
+ if (!iscsi_if_find_conn(ev->u.set_param.conn_handle))
+ return -EEXIST;
+ ev->r.retcode = transport->set_param(
+ ev->u.set_param.conn_handle,
+ ev->u.set_param.param, ev->u.set_param.value);
+ break;
+ case ISCSI_UEVENT_START_CONN:
+ if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle))
+ return -EEXIST;
+ ev->r.retcode = transport->start_conn(
+ ev->u.start_conn.conn_handle);
+ break;
+ case ISCSI_UEVENT_STOP_CONN:
+ if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle))
+ return -EEXIST;
+ transport->stop_conn(ev->u.stop_conn.conn_handle,
+ ev->u.stop_conn.flag);
+ break;
+ case ISCSI_UEVENT_SEND_PDU:
+ if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle))
+ return -EEXIST;
+ ev->r.retcode = transport->send_pdu(
+ ev->u.send_pdu.conn_handle,
+ (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
+ (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
+ ev->u.send_pdu.data_size);
+ break;
+ case ISCSI_UEVENT_GET_STATS:
+ err = iscsi_if_get_stats(transport, skb, nlh);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+/* Get message from skb (based on rtnetlink_rcv_skb). Each message is
+ * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
+ * discarded silently. */
+static void
+iscsi_if_rx(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+
+ down(&rx_queue_sema);
+ while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+ while (skb->len >= NLMSG_SPACE(0)) {
+ int err;
+ uint32_t rlen;
+ struct nlmsghdr *nlh;
+ struct iscsi_uevent *ev;
+
+ nlh = (struct nlmsghdr *)skb->data;
+ if (nlh->nlmsg_len < sizeof(*nlh) ||
+ skb->len < nlh->nlmsg_len) {
+ break;
+ }
+ ev = NLMSG_DATA(nlh);
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ err = iscsi_if_recv_msg(skb, nlh);
+ if (err) {
+ ev->type = ISCSI_KEVENT_IF_ERROR;
+ ev->iferror = err;
+ }
+ do {
+ /*
+ * special case for GET_STATS:
+ * on success - sending reply and stats from
+ * inside of if_recv_msg(),
+ * on error - fall through.
+ */
+ if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
+ break;
+ err = iscsi_if_send_reply(
+ NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
+ nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
+ if (atomic_read(&z_reply.allocated) >=
+ z_reply.hiwat)
+ ev->iferror = -ENOMEM;
+ } while (err < 0 && err != -ECONNREFUSED);
+ skb_pull(skb, rlen);
+ }
+ kfree_skb(skb);
+ }
+ up(&rx_queue_sema);
+}
+
/*
- * 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.
+ * iSCSI connection attrs
*/
-#define iscsi_host_show_str_fn(field) \
- \
+#define iscsi_conn_int_attr_show(param, format) \
static ssize_t \
-show_host_str_##field(struct class_device *cdev, char *buf) \
+show_conn_int_param_##param(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); \
+ uint32_t value = 0; \
+ struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \
+ struct iscsi_internal *priv; \
\
- if (i->fnt->get_##field) \
- ret = i->fnt->get_##field(shost, buf, PAGE_SIZE); \
- return ret; \
+ priv = to_iscsi_internal(conn->host->transportt); \
+ if (priv->param_mask & (1 << param)) \
+ priv->iscsi_transport->get_param(conn->connh, param, &value); \
+ return snprintf(buf, 20, format"\n", value); \
}

-#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);
+#define iscsi_conn_int_attr(field, param, format) \
+ iscsi_conn_int_attr_show(param, format) \
+static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL);
+
+iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u");
+iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u");
+iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d");
+iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d");
+iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d");
+iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d");

-iscsi_host_rd_str_attr(initiator_name);
-iscsi_host_rd_str_attr(initiator_alias);
+/*
+ * iSCSI session attrs
+ */
+#define iscsi_session_int_attr_show(param, format) \
+static ssize_t \
+show_session_int_param_##param(struct class_device *cdev, char *buf) \
+{ \
+ uint32_t value = 0; \
+ struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \
+ struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \
+ struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
+ struct iscsi_if_conn *conn = NULL; \
+ unsigned long flags; \
+ \
+ spin_lock_irqsave(&connlock, flags); \
+ if (!list_empty(&session->connections)) { \
+ conn = list_entry(session->connections.next, \
+ struct iscsi_if_conn, session_list); \
+ spin_unlock_irqrestore(&connlock, flags); \
+ \
+ if (conn && (priv->param_mask & (1 << param))) \
+ priv->iscsi_transport->get_param(conn->connh, \
+ param, &value);\
+ } \
+ return snprintf(buf, 20, format"\n", value); \
+}

-#define SETUP_SESSION_RD_ATTR(field) \
- if (i->fnt->show_##field) { \
- i->session_attrs[count] = &class_device_attr_##field; \
+#define iscsi_session_int_attr(field, param, format) \
+ iscsi_session_int_attr_show(param, format) \
+static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL);
+
+iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d");
+iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu");
+iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d");
+iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u");
+iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u");
+iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d");
+iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d");
+iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d");
+
+#define SETUP_SESSION_RD_ATTR(field, param) \
+ if (priv->param_mask & (1 << param)) { \
+ priv->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; \
+#define SETUP_CONN_RD_ATTR(field, param) \
+ if (priv->param_mask & (1 << param)) { \
+ priv->conn_attrs[count] = &class_device_attr_##field; \
count++; \
}

-static int iscsi_host_match(struct attribute_container *cont,
- struct device *dev)
+static int iscsi_is_session_dev(const struct device *dev)
{
+ return dev->release == iscsi_if_session_dev_release;
+}
+
+static int iscsi_session_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct iscsi_if_session *session;
struct Scsi_Host *shost;
- struct iscsi_internal *i;
+ struct iscsi_internal *priv;
+
+ if (!iscsi_is_session_dev(dev))
+ return 0;

- if (!scsi_is_host_device(dev))
+ session = iscsi_dev_to_if_session(dev);
+ shost = iscsi_if_session_to_shost(session);
+ if (!shost->transportt)
return 0;

- shost = dev_to_shost(dev);
- if (!shost->transportt || shost->transportt->host_attrs.ac.class
- != &iscsi_host_class.class)
+ priv = to_iscsi_internal(shost->transportt);
+ if (priv->session_cont.ac.class != &iscsi_session_class.class)
return 0;

- i = to_iscsi_internal(shost->transportt);
-
- return &i->t.host_attrs.ac == cont;
+ return &priv->session_cont.ac == cont;
}

-static int iscsi_target_match(struct attribute_container *cont,
- struct device *dev)
+static int iscsi_is_conn_dev(const struct device *dev)
{
+ return dev->release == iscsi_if_conn_dev_release;
+}
+
+static int iscsi_conn_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct iscsi_if_conn *conn;
struct Scsi_Host *shost;
- struct iscsi_internal *i;
+ struct iscsi_internal *priv;
+
+ if (!iscsi_is_conn_dev(dev))
+ return 0;

- if (!scsi_is_target_device(dev))
+ conn = iscsi_dev_to_if_conn(dev);
+ shost = conn->host;
+ if (!shost->transportt)
return 0;

- shost = dev_to_shost(dev->parent);
- if (!shost->transportt || shost->transportt->host_attrs.ac.class
- != &iscsi_host_class.class)
+ priv = to_iscsi_internal(shost->transportt);
+ if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
return 0;

- i = to_iscsi_internal(shost->transportt);
-
- return &i->t.target_attrs.ac == cont;
+ return &priv->conn_cont.ac == cont;
}

-struct scsi_transport_template *
-iscsi_attach_transport(struct iscsi_function_template *fnt)
+int iscsi_register_transport(struct iscsi_transport *tt)
{
- struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
- GFP_KERNEL);
+ struct iscsi_internal *priv;
+ unsigned long flags;
int count = 0;

- if (unlikely(!i))
- return NULL;
+ BUG_ON(!tt);

- memset(i, 0, sizeof(struct iscsi_internal));
- i->fnt = fnt;
+ priv = iscsi_if_transport_lookup(tt);
+ if (priv)
+ return -EEXIST;
+
+ priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ memset(priv, 0, sizeof(*priv));
+ INIT_LIST_HEAD(&priv->list);
+ INIT_LIST_HEAD(&priv->sessions);
+ spin_lock_init(&priv->session_lock);
+ priv->iscsi_transport = tt;
+
+ /* setup parameters mask */
+ priv->param_mask = 0xFFFFFFFF;
+ if (!(tt->caps & CAP_MULTI_R2T))
+ priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T);
+ if (!(tt->caps & CAP_HDRDGST))
+ priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN);
+ if (!(tt->caps & CAP_DATADGST))
+ priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN);
+ if (!(tt->caps & CAP_MARKERS)) {
+ priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN);
+ priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN);
+ }

- 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);
+ /* connection parameters */
+ priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
+ priv->conn_cont.ac.class = &iscsi_connection_class.class;
+ priv->conn_cont.ac.match = iscsi_conn_match;
+ transport_container_register(&priv->conn_cont);
+
+ SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
+ SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
+ SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN);
+ SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN);
+ SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN);
+ SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN);

- BUG_ON(count > ISCSI_SESSION_ATTRS);
- i->session_attrs[count] = NULL;
+ BUG_ON(count > ISCSI_CONN_ATTRS);
+ priv->conn_attrs[count] = NULL;
+ count = 0;

- 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;
+ /* session parameters */
+ priv->session_cont.ac.attrs = &priv->session_attrs[0];
+ priv->session_cont.ac.class = &iscsi_session_class.class;
+ priv->session_cont.ac.match = iscsi_session_match;
+ transport_container_register(&priv->session_cont);
+
+ SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN);
+ SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T);
+ SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN);
+ SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST);
+ SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST);
+ SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN);
+ SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN)
+ SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL);

- count = 0;
- SETUP_HOST_RD_ATTR(initiator_name);
- SETUP_HOST_RD_ATTR(initiator_alias);
+ BUG_ON(count > ISCSI_SESSION_ATTRS);
+ priv->session_attrs[count] = NULL;

- BUG_ON(count > ISCSI_HOST_ATTRS);
- i->host_attrs[count] = NULL;
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_add(&priv->list, &iscsi_transports);
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);

- return &i->t;
+ printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
+ return 0;
}
+EXPORT_SYMBOL_GPL(iscsi_register_transport);
+
+int iscsi_unregister_transport(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;
+
+ BUG_ON(!tt);
+
+ down(&rx_queue_sema);
+
+ priv = iscsi_if_transport_lookup(tt);
+ BUG_ON (!priv);
+
+ spin_lock_irqsave(&priv->session_lock, flags);
+ if (!list_empty(&priv->sessions)) {
+ spin_unlock_irqrestore(&priv->session_lock, flags);
+ up(&rx_queue_sema);
+ return -EPERM;
+ }
+ spin_unlock_irqrestore(&priv->session_lock, flags);
+
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_del(&priv->list);
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+
+ transport_container_unregister(&priv->conn_cont);
+ transport_container_unregister(&priv->session_cont);
+ kfree(priv);
+ up(&rx_queue_sema);

-EXPORT_SYMBOL(iscsi_attach_transport);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_unregister_transport);

-void iscsi_release_transport(struct scsi_transport_template *t)
+static int
+iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
{
- struct iscsi_internal *i = to_iscsi_internal(t);
+ struct netlink_notify *n = ptr;
+
+ if (event == NETLINK_URELEASE &&
+ n->protocol == NETLINK_ISCSI && n->pid) {
+ struct iscsi_if_conn *conn;
+ unsigned long flags;
+
+ mempool_zone_complete(&z_reply);
+ spin_lock_irqsave(&connlock, flags);
+ list_for_each_entry(conn, &connlist, conn_list) {
+ mempool_zone_complete(&conn->z_error);
+ mempool_zone_complete(&conn->z_pdu);
+ }
+ spin_unlock_irqrestore(&connlock, flags);
+ }

- transport_container_unregister(&i->t.target_attrs);
- transport_container_unregister(&i->t.host_attrs);
-
- kfree(i);
+ return NOTIFY_DONE;
}

-EXPORT_SYMBOL(iscsi_release_transport);
+static struct notifier_block iscsi_nl_notifier = {
+ .notifier_call = iscsi_rcv_nl_event,
+};

static __init int iscsi_transport_init(void)
{
- int err = transport_class_register(&iscsi_transport_class);
+ int err;

+ err = transport_class_register(&iscsi_connection_class);
if (err)
return err;
- return transport_class_register(&iscsi_host_class);
+
+ err = transport_class_register(&iscsi_session_class);
+ if (err)
+ goto unregister_conn_class;
+
+ netlink_register_notifier(&iscsi_nl_notifier);
+ nls = netlink_kernel_create(NETLINK_ISCSI, iscsi_if_rx);
+ if (!nls) {
+ err = -ENOBUFS;
+ goto unregister_notifier;
+ }
+
+ err = mempool_zone_init(&z_reply, Z_MAX_REPLY,
+ NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
+ if (!err)
+ return 0;
+
+ sock_release(nls->sk_socket);
+ unregister_notifier:
+ netlink_unregister_notifier(&iscsi_nl_notifier);
+ unregister_conn_class:
+ transport_class_unregister(&iscsi_connection_class);
+ return err;
}

static void __exit iscsi_transport_exit(void)
{
- transport_class_unregister(&iscsi_host_class);
- transport_class_unregister(&iscsi_transport_class);
+ mempool_destroy(z_reply.pool);
+ sock_release(nls->sk_socket);
+ netlink_unregister_notifier(&iscsi_nl_notifier);
+ transport_class_unregister(&iscsi_connection_class);
+ transport_class_unregister(&iscsi_session_class);
}

module_init(iscsi_transport_init);
module_exit(iscsi_transport_exit);

-MODULE_AUTHOR("Mike Christie");
-MODULE_DESCRIPTION("iSCSI Transport Attributes");
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
+ "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
+ "Alex Aizman <itn780@yahoo.com>");
+MODULE_DESCRIPTION("iSCSI Transport Interface");
MODULE_LICENSE("GPL");
diff -aurp linux-2.6.12-rc4/include/scsi/scsi_transport_iscsi.h linux-2.6.12-rc4.work/include/scsi/scsi_transport_iscsi.h
--- linux-2.6.12-rc4/include/scsi/scsi_transport_iscsi.h 2005-05-06 22:20:31.000000000 -0700
+++ linux-2.6.12-rc4.work/include/scsi/scsi_transport_iscsi.h 2005-05-14 12:19:35.000000000 -0700
@@ -1,8 +1,8 @@
-/*
+/*
* iSCSI transport class definitions
*
* Copyright (C) IBM Corporation, 2004
- * Copyright (C) Mike Christie, 2004
+ * Copyright (C) Mike Christie, Dmitry Yusupov, Alex Aizman, 2004 - 2005
*
* 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
@@ -21,158 +21,68 @@
#ifndef SCSI_TRANSPORT_ISCSI_H
#define SCSI_TRANSPORT_ISCSI_H

-#include <linux/config.h>
-#include <linux/in6.h>
-#include <linux/in.h>
-
-struct scsi_transport_template;
+#include <scsi/iscsi_if.h>

-struct iscsi_class_session {
- uint8_t isid[6];
- uint16_t tsih;
- int header_digest; /* 1 CRC32, 0 None */
- int data_digest; /* 1 CRC32, 0 None */
- uint16_t tpgt;
- union {
- struct in6_addr sin6_addr;
- struct in_addr sin_addr;
- } u;
- sa_family_t addr_type; /* must be AF_INET or AF_INET6 */
- uint16_t port; /* must be in network byte order */
- int initial_r2t; /* 1 Yes, 0 No */
- int immediate_data; /* 1 Yes, 0 No */
- uint32_t max_recv_data_segment_len;
- uint32_t max_burst_len;
- uint32_t first_burst_len;
- uint16_t def_time2wait;
- uint16_t def_time2retain;
- uint16_t max_outstanding_r2t;
- int data_pdu_in_order; /* 1 Yes, 0 No */
- int data_sequence_in_order; /* 1 Yes, 0 No */
- int erl;
+/**
+ * struct iscsi_transport - iSCSI Transport template
+ *
+ * @name: transport name
+ * @caps: iSCSI Data-Path capabilities
+ * @create_session: create new iSCSI session object
+ * @destroy_session: destroy existing iSCSI session object
+ * @create_conn: create new iSCSI connection
+ * @bind_conn: associate this connection with existing iSCSI session
+ * and specified transport descriptor
+ * @destroy_conn: destroy inactive iSCSI connection
+ * @set_param: set iSCSI Data-Path operational parameter
+ * @start_conn: set connection to be operational
+ * @stop_conn: suspend/recover/terminate connection
+ * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
+ *
+ * Template API provided by iSCSI Transport
+ */
+struct iscsi_transport {
+ struct module *owner;
+ char *name;
+ unsigned int caps;
+ struct scsi_host_template *host_template;
+ int hostdata_size;
+ int max_lun;
+ unsigned int max_conn;
+ unsigned int max_cmd_len;
+ iscsi_sessionh_t (*create_session) (uint32_t initial_cmdsn,
+ struct Scsi_Host *shost);
+ void (*destroy_session) (iscsi_sessionh_t session);
+ iscsi_connh_t (*create_conn) (iscsi_sessionh_t session, uint32_t cid);
+ int (*bind_conn) (iscsi_sessionh_t session, iscsi_connh_t conn,
+ uint32_t transport_fd, int is_leading);
+ int (*start_conn) (iscsi_connh_t conn);
+ void (*stop_conn) (iscsi_connh_t conn, int flag);
+ void (*destroy_conn) (iscsi_connh_t conn);
+ int (*set_param) (iscsi_connh_t conn, enum iscsi_param param,
+ uint32_t value);
+ int (*get_param) (iscsi_connh_t conn, enum iscsi_param param,
+ uint32_t *value);
+ int (*send_pdu) (iscsi_connh_t conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size);
+ void (*get_stats) (iscsi_connh_t conn, struct iscsi_stats *stats);
+ /*
+ * transport class private data
+ */
+ struct scsi_transport_template *scsi_transport;
};

/*
- * accessor macros
+ * transport registration upcalls
*/
-#define iscsi_isid(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->isid)
-#define iscsi_tsih(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->tsih)
-#define iscsi_header_digest(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->header_digest)
-#define iscsi_data_digest(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->data_digest)
-#define iscsi_port(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->port)
-#define iscsi_addr_type(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->addr_type)
-#define iscsi_sin_addr(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->u.sin_addr)
-#define iscsi_sin6_addr(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->u.sin6_addr)
-#define iscsi_tpgt(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->tpgt)
-#define iscsi_initial_r2t(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->initial_r2t)
-#define iscsi_immediate_data(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->immediate_data)
-#define iscsi_max_recv_data_segment_len(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->max_recv_data_segment_len)
-#define iscsi_max_burst_len(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->max_burst_len)
-#define iscsi_first_burst_len(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->first_burst_len)
-#define iscsi_def_time2wait(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->def_time2wait)
-#define iscsi_def_time2retain(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->def_time2retain)
-#define iscsi_max_outstanding_r2t(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->max_outstanding_r2t)
-#define iscsi_data_pdu_in_order(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->data_pdu_in_order)
-#define iscsi_data_sequence_in_order(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->data_sequence_in_order)
-#define iscsi_erl(x) \
- (((struct iscsi_class_session *)&(x)->starget_data)->erl)
+extern int iscsi_register_transport(struct iscsi_transport *tt);
+extern int iscsi_unregister_transport(struct iscsi_transport *tt);

/*
- * The functions by which the transport class and the driver communicate
+ * control plane upcalls
*/
-struct iscsi_function_template {
- /*
- * target attrs
- */
- void (*get_isid)(struct scsi_target *);
- void (*get_tsih)(struct scsi_target *);
- void (*get_header_digest)(struct scsi_target *);
- void (*get_data_digest)(struct scsi_target *);
- void (*get_port)(struct scsi_target *);
- void (*get_tpgt)(struct scsi_target *);
- /*
- * In get_ip_address the lld must set the address and
- * the address type
- */
- void (*get_ip_address)(struct scsi_target *);
- /*
- * The lld should snprintf the name or alias to the buffer
- */
- ssize_t (*get_target_name)(struct scsi_target *, char *, ssize_t);
- ssize_t (*get_target_alias)(struct scsi_target *, char *, ssize_t);
- void (*get_initial_r2t)(struct scsi_target *);
- void (*get_immediate_data)(struct scsi_target *);
- void (*get_max_recv_data_segment_len)(struct scsi_target *);
- void (*get_max_burst_len)(struct scsi_target *);
- void (*get_first_burst_len)(struct scsi_target *);
- void (*get_def_time2wait)(struct scsi_target *);
- void (*get_def_time2retain)(struct scsi_target *);
- void (*get_max_outstanding_r2t)(struct scsi_target *);
- void (*get_data_pdu_in_order)(struct scsi_target *);
- void (*get_data_sequence_in_order)(struct scsi_target *);
- void (*get_erl)(struct scsi_target *);
-
- /*
- * host atts
- */
-
- /*
- * The lld should snprintf the name or alias to the buffer
- */
- ssize_t (*get_initiator_alias)(struct Scsi_Host *, char *, ssize_t);
- ssize_t (*get_initiator_name)(struct Scsi_Host *, char *, ssize_t);
- /*
- * The driver sets these to tell the transport class it
- * wants the attributes displayed in sysfs. If the show_ flag
- * is not set, the attribute will be private to the transport
- * class. We could probably just test if a get_ fn was set
- * since we only use the values for sysfs but this is how
- * fc does it too.
- */
- unsigned long show_isid:1;
- unsigned long show_tsih:1;
- unsigned long show_header_digest:1;
- unsigned long show_data_digest:1;
- unsigned long show_port:1;
- unsigned long show_tpgt:1;
- unsigned long show_ip_address:1;
- unsigned long show_target_name:1;
- unsigned long show_target_alias:1;
- unsigned long show_initial_r2t:1;
- unsigned long show_immediate_data:1;
- unsigned long show_max_recv_data_segment_len:1;
- unsigned long show_max_burst_len:1;
- unsigned long show_first_burst_len:1;
- unsigned long show_def_time2wait:1;
- unsigned long show_def_time2retain:1;
- unsigned long show_max_outstanding_r2t:1;
- unsigned long show_data_pdu_in_order:1;
- unsigned long show_data_sequence_in_order:1;
- unsigned long show_erl:1;
- unsigned long show_initiator_name:1;
- unsigned long show_initiator_alias:1;
-};
-
-struct scsi_transport_template *iscsi_attach_transport(struct iscsi_function_template *);
-void iscsi_release_transport(struct scsi_transport_template *);
+extern void iscsi_conn_error(iscsi_connh_t conn, enum iscsi_err error);
+extern int iscsi_recv_pdu(iscsi_connh_t conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size);

#endif