-/*
+/*
* 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
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/mutex.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_if.h>
-#define ISCSI_SESSION_ATTRS 20
-#define ISCSI_HOST_ATTRS 2
+#define ISCSI_SESSION_ATTRS 11
+#define ISCSI_CONN_ATTRS 11
+#define ISCSI_HOST_ATTRS 0
struct iscsi_internal {
+ int daemon_pid;
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 iscsi_transport *iscsi_transport;
+ struct list_head list;
+ struct class_device cdev;
+
struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
+ 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];
+};
+
+static int iscsi_session_nr; /* sysfs session id for next new session */
+
+/*
+ * list of registered transports and lock that must
+ * be held while accessing list. The iscsi_transport_lock must
+ * be acquired after the rx_queue_mutex.
+ */
+static LIST_HEAD(iscsi_transports);
+static DEFINE_SPINLOCK(iscsi_transport_lock);
+
+#define to_iscsi_internal(tmpl) \
+ container_of(tmpl, struct iscsi_internal, t)
+
+#define cdev_to_iscsi_internal(_cdev) \
+ container_of(_cdev, struct iscsi_internal, cdev)
+
+static void iscsi_transport_release(struct class_device *cdev)
+{
+ struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
+ kfree(priv);
+}
+
+/*
+ * iscsi_transport_class represents the iscsi_transports that are
+ * registered.
+ */
+static struct class iscsi_transport_class = {
+ .name = "iscsi_transport",
+ .release = iscsi_transport_release,
+};
+
+static ssize_t
+show_transport_handle(struct class_device *cdev, char *buf)
+{
+ struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
+ return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
+}
+static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
+
+#define show_transport_attr(name, format) \
+static ssize_t \
+show_transport_##name(struct class_device *cdev, char *buf) \
+{ \
+ struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
+ return sprintf(buf, format"\n", priv->iscsi_transport->name); \
+} \
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
+
+show_transport_attr(caps, "0x%x");
+show_transport_attr(max_lun, "%d");
+show_transport_attr(max_conn, "%d");
+show_transport_attr(max_cmd_len, "%d");
+
+static struct attribute *iscsi_transport_attrs[] = {
+ &class_device_attr_handle.attr,
+ &class_device_attr_caps.attr,
+ &class_device_attr_max_lun.attr,
+ &class_device_attr_max_conn.attr,
+ &class_device_attr_max_cmd_len.attr,
+ NULL,
+};
+
+static struct attribute_group iscsi_transport_group = {
+ .attrs = iscsi_transport_attrs,
};
-#define to_iscsi_internal(tmpl) container_of(tmpl, struct iscsi_internal, t)
+static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
+ struct class_device *cdev)
+{
+ struct Scsi_Host *shost = dev_to_shost(dev);
+ struct iscsi_host *ihost = shost->shost_data;
+
+ memset(ihost, 0, sizeof(*ihost));
+ INIT_LIST_HEAD(&ihost->sessions);
+ mutex_init(&ihost->mutex);
+ return 0;
+}
+
+static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
+ "iscsi_host",
+ iscsi_setup_host,
+ NULL,
+ NULL);
-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 DEFINE_MUTEX(rx_queue_mutex);
+
+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 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
+
+static LIST_HEAD(sesslist);
+static DEFINE_SPINLOCK(sesslock);
+static LIST_HEAD(connlist);
+static DEFINE_SPINLOCK(connlock);
+
+static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
+{
+ struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
+ return sess->sid;
}
-#define iscsi_session_rd_attr(field, format) \
- iscsi_session_show_fn(field, format) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_##field, NULL);
+/*
+ * Returns the matching session to a given sid
+ */
+static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
+{
+ unsigned long flags;
+ struct iscsi_cls_session *sess;
-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");
+ spin_lock_irqsave(&sesslock, flags);
+ list_for_each_entry(sess, &sesslist, sess_list) {
+ if (sess->sid == sid) {
+ spin_unlock_irqrestore(&sesslock, flags);
+ return sess;
+ }
+ }
+ spin_unlock_irqrestore(&sesslock, flags);
+ return NULL;
+}
+/*
+ * Returns the matching connection to a given sid / cid tuple
+ */
+static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
+{
+ unsigned long flags;
+ struct iscsi_cls_conn *conn;
-#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"); \
+ spin_lock_irqsave(&connlock, flags);
+ list_for_each_entry(conn, &connlist, conn_list) {
+ if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
+ 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);
+/*
+ * The following functions can be used by LLDs that allocate
+ * their own scsi_hosts or by software iscsi LLDs
+ */
+static void iscsi_session_release(struct device *dev)
+{
+ struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
+ struct iscsi_transport *transport = session->transport;
+ struct Scsi_Host *shost;
-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);
+ shost = iscsi_session_to_shost(session);
+ scsi_host_put(shost);
+ kfree(session->targetname);
+ kfree(session);
+ module_put(transport->owner);
+}
-#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 int iscsi_is_session_dev(const struct device *dev)
+{
+ return dev->release == iscsi_session_release;
}
-#define iscsi_session_rd_digest_attr(field) \
- iscsi_session_show_digest_fn(field) \
-static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
+static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
+ uint id, uint lun)
+{
+ struct iscsi_host *ihost = shost->shost_data;
+ struct iscsi_cls_session *session;
-iscsi_session_rd_digest_attr(header_digest);
-iscsi_session_rd_digest_attr(data_digest);
+ mutex_lock(&ihost->mutex);
+ list_for_each_entry(session, &ihost->sessions, host_list) {
+ if ((channel == SCAN_WILD_CARD ||
+ channel == session->channel) &&
+ (id == SCAN_WILD_CARD || id == session->target_id))
+ scsi_scan_target(&session->dev, session->channel,
+ session->target_id, lun, 1);
+ }
+ mutex_unlock(&ihost->mutex);
-static ssize_t
-show_port(struct class_device *cdev, char *buf)
+ return 0;
+}
+
+static void session_recovery_timedout(void *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);
+ struct iscsi_cls_session *session = data;
+
+ dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed "
+ "out after %d secs\n", session->recovery_tmo);
- if (i->fnt->get_port)
- i->fnt->get_port(starget);
+ if (session->transport->session_recovery_timedout)
+ session->transport->session_recovery_timedout(session);
- return snprintf(buf, 20, "%hu\n", ntohs(iscsi_port(starget)));
+ scsi_target_unblock(&session->dev);
}
-static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
-static ssize_t
-show_ip_address(struct class_device *cdev, char *buf)
+void iscsi_unblock_session(struct iscsi_cls_session *session)
+{
+ if (!cancel_delayed_work(&session->recovery_work))
+ flush_scheduled_work();
+ scsi_target_unblock(&session->dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_unblock_session);
+
+void iscsi_block_session(struct iscsi_cls_session *session)
+{
+ scsi_target_block(&session->dev);
+ schedule_delayed_work(&session->recovery_work,
+ session->recovery_tmo * HZ);
+}
+EXPORT_SYMBOL_GPL(iscsi_block_session);
+
+/**
+ * iscsi_create_session - create iscsi class session
+ * @shost: scsi host
+ * @transport: iscsi transport
+ *
+ * This can be called from a LLD or iscsi_transport.
+ **/
+struct iscsi_cls_session *
+iscsi_create_session(struct Scsi_Host *shost,
+ struct iscsi_transport *transport, int channel)
+{
+ struct iscsi_host *ihost;
+ struct iscsi_cls_session *session;
+ int err;
+
+ if (!try_module_get(transport->owner))
+ return NULL;
+
+ session = kzalloc(sizeof(*session) + transport->sessiondata_size,
+ GFP_KERNEL);
+ if (!session)
+ goto module_put;
+ session->transport = transport;
+ session->recovery_tmo = 120;
+ INIT_WORK(&session->recovery_work, session_recovery_timedout, session);
+ INIT_LIST_HEAD(&session->host_list);
+ INIT_LIST_HEAD(&session->sess_list);
+
+ if (transport->sessiondata_size)
+ session->dd_data = &session[1];
+
+ /* this is released in the dev's release function */
+ scsi_host_get(shost);
+ ihost = shost->shost_data;
+
+ session->sid = iscsi_session_nr++;
+ session->channel = channel;
+ session->target_id = ihost->next_target_id++;
+
+ snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
+ session->sid);
+ session->dev.parent = &shost->shost_gendev;
+ session->dev.release = iscsi_session_release;
+ err = device_register(&session->dev);
+ if (err) {
+ dev_printk(KERN_ERR, &session->dev, "iscsi: could not "
+ "register session's dev\n");
+ goto free_session;
+ }
+ transport_register_device(&session->dev);
+
+ mutex_lock(&ihost->mutex);
+ list_add(&session->host_list, &ihost->sessions);
+ mutex_unlock(&ihost->mutex);
+
+ return session;
+
+free_session:
+ kfree(session);
+module_put:
+ module_put(transport->owner);
+ return NULL;
+}
+
+EXPORT_SYMBOL_GPL(iscsi_create_session);
+
+/**
+ * iscsi_destroy_session - destroy iscsi session
+ * @session: iscsi_session
+ *
+ * Can be called by a LLD or iscsi_transport. There must not be
+ * any running connections.
+ **/
+int iscsi_destroy_session(struct iscsi_cls_session *session)
{
- 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);
+ struct Scsi_Host *shost = iscsi_session_to_shost(session);
+ struct iscsi_host *ihost = shost->shost_data;
- if (i->fnt->get_ip_address)
- i->fnt->get_ip_address(starget);
+ if (!cancel_delayed_work(&session->recovery_work))
+ flush_scheduled_work();
- 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;
+ mutex_lock(&ihost->mutex);
+ list_del(&session->host_list);
+ mutex_unlock(&ihost->mutex);
+
+ transport_unregister_device(&session->dev);
+ device_unregister(&session->dev);
+ return 0;
}
-static CLASS_DEVICE_ATTR(ip_address, S_IRUGO, show_ip_address, NULL);
-static ssize_t
-show_isid(struct class_device *cdev, char *buf)
+EXPORT_SYMBOL_GPL(iscsi_destroy_session);
+
+static void iscsi_conn_release(struct device *dev)
+{
+ struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
+ struct device *parent = conn->dev.parent;
+
+ kfree(conn->persistent_address);
+ kfree(conn);
+ put_device(parent);
+}
+
+static int iscsi_is_conn_dev(const struct device *dev)
+{
+ return dev->release == iscsi_conn_release;
+}
+
+/**
+ * iscsi_create_conn - create iscsi class connection
+ * @session: iscsi cls session
+ * @cid: connection id
+ *
+ * This can be called from a LLD or iscsi_transport. The connection
+ * is child of the session so cid must be unique for all connections
+ * on the session.
+ *
+ * Since we do not support MCS, cid will normally be zero. In some cases
+ * for software iscsi we could be trying to preallocate a connection struct
+ * in which case there could be two connection structs and cid would be
+ * non-zero.
+ **/
+struct iscsi_cls_conn *
+iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
{
- 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);
+ struct iscsi_transport *transport = session->transport;
+ struct iscsi_cls_conn *conn;
+ int err;
- if (i->fnt->get_isid)
- i->fnt->get_isid(starget);
+ conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
+ if (!conn)
+ return NULL;
+
+ if (transport->conndata_size)
+ conn->dd_data = &conn[1];
+
+ INIT_LIST_HEAD(&conn->conn_list);
+ conn->transport = transport;
+ conn->cid = cid;
+
+ /* this is released in the dev's release function */
+ if (!get_device(&session->dev))
+ goto free_conn;
+
+ snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
+ session->sid, cid);
+ conn->dev.parent = &session->dev;
+ conn->dev.release = iscsi_conn_release;
+ err = device_register(&conn->dev);
+ if (err) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register "
+ "connection's dev\n");
+ goto release_parent_ref;
+ }
+ transport_register_device(&conn->dev);
+ return conn;
- 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]);
+release_parent_ref:
+ put_device(&session->dev);
+free_conn:
+ kfree(conn);
+ return NULL;
}
-static CLASS_DEVICE_ATTR(isid, S_IRUGO, show_isid, NULL);
+
+EXPORT_SYMBOL_GPL(iscsi_create_conn);
+
+/**
+ * iscsi_destroy_conn - destroy iscsi class connection
+ * @session: iscsi cls session
+ *
+ * This can be called from a LLD or iscsi_transport.
+ **/
+int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
+{
+ transport_unregister_device(&conn->dev);
+ device_unregister(&conn->dev);
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
/*
- * 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 interface functions
*/
-#define iscsi_session_show_str_fn(field) \
- \
+static struct iscsi_internal *
+iscsi_if_transport_lookup(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;
+
+ 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;
+}
+
+static inline struct list_head *skb_to_lh(struct sk_buff *skb)
+{
+ return (struct list_head *)&skb->cb;
+}
+
+static void*
+mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data)
+{
+ struct mempool_zone *zone = pool_data;
+
+ return alloc_skb(zone->size, gfp_mask);
+}
+
+static void
+mempool_zone_free_skb(void *element, void *pool_data)
+{
+ kfree_skb(element);
+}
+
+static void
+mempool_zone_complete(struct mempool_zone *zone)
+{
+ unsigned long flags;
+ struct list_head *lh, *n;
+
+ 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 struct mempool_zone *
+mempool_zone_init(unsigned max, unsigned size, unsigned hiwat)
+{
+ struct mempool_zone *zp;
+
+ zp = kzalloc(sizeof(*zp), GFP_KERNEL);
+ if (!zp)
+ return NULL;
+
+ zp->size = size;
+ zp->hiwat = hiwat;
+ INIT_LIST_HEAD(&zp->freequeue);
+ spin_lock_init(&zp->freelock);
+ atomic_set(&zp->allocated, 0);
+
+ zp->pool = mempool_create(max, mempool_zone_alloc_skb,
+ mempool_zone_free_skb, zp);
+ if (!zp->pool) {
+ kfree(zp);
+ return NULL;
+ }
+
+ return zp;
+}
+
+static void mempool_zone_destroy(struct mempool_zone *zp)
+{
+ mempool_destroy(zp->pool);
+ kfree(zp);
+}
+
+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 int
+iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid)
+{
+ unsigned long flags;
+ int rc;
+
+ skb_get(skb);
+ rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
+ if (rc < 0) {
+ mempool_free(skb, zone->pool);
+ printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
+ return rc;
+ }
+
+ spin_lock_irqsave(&zone->freelock, flags);
+ INIT_LIST_HEAD(skb_to_lh(skb));
+ list_add(skb_to_lh(skb), &zone->freequeue);
+ spin_unlock_irqrestore(&zone->freelock, flags);
+
+ return 0;
+}
+
+int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ char *pdu;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
+ data_size);
+
+ priv = iscsi_if_transport_lookup(conn->transport);
+ if (!priv)
+ return -EINVAL;
+
+ mempool_zone_complete(conn->z_pdu);
+
+ skb = mempool_zone_get_skb(conn->z_pdu);
+ if (!skb) {
+ iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver "
+ "control PDU: OOM\n");
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
+ 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.cid = conn->cid;
+ ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
+ 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, priv->daemon_pid);
+}
+EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
+
+void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev));
+
+ priv = iscsi_if_transport_lookup(conn->transport);
+ if (!priv)
+ return;
+
+ mempool_zone_complete(conn->z_error);
+
+ skb = mempool_zone_get_skb(conn->z_error);
+ if (!skb) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored "
+ "conn error (%d)\n", error);
+ return;
+ }
+
+ nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
+ 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.cid = conn->cid;
+ ev->r.connerror.sid = iscsi_conn_get_sid(conn);
+
+ iscsi_unicast_skb(conn->z_error, skb, priv->daemon_pid);
+
+ dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n",
+ 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)), 0);
+ nlh->nlmsg_flags = flags;
+ memcpy(NLMSG_DATA(nlh), payload, size);
+ return iscsi_unicast_skb(z_reply, skb, pid);
+}
+
+static int
+iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
+{
+ struct iscsi_uevent *ev = NLMSG_DATA(nlh);
+ struct iscsi_stats *stats;
+ struct sk_buff *skbstat;
+ struct iscsi_cls_conn *conn;
+ struct nlmsghdr *nlhstat;
+ struct iscsi_uevent *evstat;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev) +
+ sizeof(struct iscsi_stats) +
+ sizeof(struct iscsi_stats_custom) *
+ ISCSI_STATS_CUSTOM_MAX);
+ int err = 0;
+
+ priv = iscsi_if_transport_lookup(transport);
+ if (!priv)
+ return -EINVAL;
+
+ conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
+ if (!conn)
+ return -EEXIST;
+
+ do {
+ int actual_size;
+
+ mempool_zone_complete(conn->z_pdu);
+
+ skbstat = mempool_zone_get_skb(conn->z_pdu);
+ if (!skbstat) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not "
+ "deliver stats: OOM\n");
+ return -ENOMEM;
+ }
+
+ nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
+ (len - sizeof(*nlhstat)), 0);
+ 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.cid =
+ ev->u.get_stats.cid;
+ evstat->u.get_stats.sid =
+ ev->u.get_stats.sid;
+ stats = (struct iscsi_stats *)
+ ((char*)evstat + sizeof(*evstat));
+ memset(stats, 0, sizeof(*stats));
+
+ transport->get_stats(conn, 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(skbstat, NLMSG_ALIGN(actual_size));
+ nlhstat->nlmsg_len = actual_size;
+
+ err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid);
+ } while (err < 0 && err != -ECONNREFUSED);
+
+ return err;
+}
+
+static int
+iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
+{
+ struct iscsi_transport *transport = priv->iscsi_transport;
+ struct iscsi_cls_session *session;
+ unsigned long flags;
+ uint32_t hostno;
+
+ session = transport->create_session(transport, &priv->t,
+ ev->u.c_session.initial_cmdsn,
+ &hostno);
+ if (!session)
+ return -ENOMEM;
+
+ spin_lock_irqsave(&sesslock, flags);
+ list_add(&session->sess_list, &sesslist);
+ spin_unlock_irqrestore(&sesslock, flags);
+
+ ev->r.c_session_ret.host_no = hostno;
+ ev->r.c_session_ret.sid = session->sid;
+ return 0;
+}
+
+static int
+iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct iscsi_cls_conn *conn;
+ struct iscsi_cls_session *session;
+ unsigned long flags;
+
+ session = iscsi_session_lookup(ev->u.c_conn.sid);
+ if (!session) {
+ printk(KERN_ERR "iscsi: invalid session %d\n",
+ ev->u.c_conn.sid);
+ return -EINVAL;
+ }
+
+ conn = transport->create_conn(session, ev->u.c_conn.cid);
+ if (!conn) {
+ printk(KERN_ERR "iscsi: couldn't create a new "
+ "connection for session %d\n",
+ session->sid);
+ return -ENOMEM;
+ }
+
+ conn->z_pdu = mempool_zone_init(Z_MAX_PDU,
+ NLMSG_SPACE(sizeof(struct iscsi_uevent) +
+ sizeof(struct iscsi_hdr) +
+ DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
+ Z_HIWAT_PDU);
+ if (!conn->z_pdu) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
+ "pdu zone for new conn\n");
+ goto destroy_conn;
+ }
+
+ conn->z_error = mempool_zone_init(Z_MAX_ERROR,
+ NLMSG_SPACE(sizeof(struct iscsi_uevent)),
+ Z_HIWAT_ERROR);
+ if (!conn->z_error) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
+ "error zone for new conn\n");
+ goto free_pdu_pool;
+ }
+
+ ev->r.c_conn_ret.sid = session->sid;
+ ev->r.c_conn_ret.cid = conn->cid;
+
+ spin_lock_irqsave(&connlock, flags);
+ list_add(&conn->conn_list, &connlist);
+ conn->active = 1;
+ spin_unlock_irqrestore(&connlock, flags);
+
+ return 0;
+
+free_pdu_pool:
+ mempool_zone_destroy(conn->z_pdu);
+destroy_conn:
+ if (transport->destroy_conn)
+ transport->destroy_conn(conn->dd_data);
+ return -ENOMEM;
+}
+
+static int
+iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ unsigned long flags;
+ struct iscsi_cls_conn *conn;
+ struct mempool_zone *z_error, *z_pdu;
+
+ conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
+ if (!conn)
+ return -EINVAL;
+ spin_lock_irqsave(&connlock, flags);
+ conn->active = 0;
+ list_del(&conn->conn_list);
+ spin_unlock_irqrestore(&connlock, flags);
+
+ z_pdu = conn->z_pdu;
+ z_error = conn->z_error;
+
+ if (transport->destroy_conn)
+ transport->destroy_conn(conn);
+
+ mempool_zone_destroy(z_pdu);
+ mempool_zone_destroy(z_error);
+
+ return 0;
+}
+
+static void
+iscsi_copy_param(struct iscsi_uevent *ev, uint32_t *value, char *data)
+{
+ if (ev->u.set_param.len != sizeof(uint32_t))
+ BUG();
+ memcpy(value, data, min_t(uint32_t, sizeof(uint32_t),
+ ev->u.set_param.len));
+}
+
+static int
+iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ char *data = (char*)ev + sizeof(*ev);
+ struct iscsi_cls_conn *conn;
+ struct iscsi_cls_session *session;
+ int err = 0;
+ uint32_t value = 0;
+
+ session = iscsi_session_lookup(ev->u.set_param.sid);
+ conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
+ if (!conn || !session)
+ return -EINVAL;
+
+ switch (ev->u.set_param.param) {
+ case ISCSI_PARAM_SESS_RECOVERY_TMO:
+ iscsi_copy_param(ev, &value, data);
+ if (value != 0)
+ session->recovery_tmo = value;
+ break;
+ case ISCSI_PARAM_TARGET_NAME:
+ /* this should not change between logins */
+ if (session->targetname)
+ return 0;
+
+ session->targetname = kstrdup(data, GFP_KERNEL);
+ if (!session->targetname)
+ return -ENOMEM;
+ break;
+ case ISCSI_PARAM_TPGT:
+ iscsi_copy_param(ev, &value, data);
+ session->tpgt = value;
+ break;
+ case ISCSI_PARAM_PERSISTENT_PORT:
+ iscsi_copy_param(ev, &value, data);
+ conn->persistent_port = value;
+ break;
+ case ISCSI_PARAM_PERSISTENT_ADDRESS:
+ /*
+ * this is the address returned in discovery so it should
+ * not change between logins.
+ */
+ if (conn->persistent_address)
+ return 0;
+
+ conn->persistent_address = kstrdup(data, GFP_KERNEL);
+ if (!conn->persistent_address)
+ return -ENOMEM;
+ break;
+ default:
+ iscsi_copy_param(ev, &value, data);
+ err = transport->set_param(conn, ev->u.set_param.param, value);
+ }
+
+ return err;
+}
+
+static int
+iscsi_if_transport_ep(struct iscsi_transport *transport,
+ struct iscsi_uevent *ev, int msg_type)
+{
+ struct sockaddr *dst_addr;
+ int rc = 0;
+
+ switch (msg_type) {
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
+ if (!transport->ep_connect)
+ return -EINVAL;
+
+ dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
+ rc = transport->ep_connect(dst_addr,
+ ev->u.ep_connect.non_blocking,
+ &ev->r.ep_connect_ret.handle);
+ break;
+ case ISCSI_UEVENT_TRANSPORT_EP_POLL:
+ if (!transport->ep_poll)
+ return -EINVAL;
+
+ ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
+ ev->u.ep_poll.timeout_ms);
+ break;
+ case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+ if (!transport->ep_disconnect)
+ return -EINVAL;
+
+ transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
+ break;
+ }
+ return rc;
+}
+
+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;
+ struct iscsi_cls_session *session;
+ struct iscsi_cls_conn *conn;
+ unsigned long flags;
+
+ priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
+ if (!priv)
+ return -EINVAL;
+ transport = priv->iscsi_transport;
+
+ if (!try_module_get(transport->owner))
+ return -EINVAL;
+
+ priv->daemon_pid = NETLINK_CREDS(skb)->pid;
+
+ switch (nlh->nlmsg_type) {
+ case ISCSI_UEVENT_CREATE_SESSION:
+ err = iscsi_if_create_session(priv, ev);
+ break;
+ case ISCSI_UEVENT_DESTROY_SESSION:
+ session = iscsi_session_lookup(ev->u.d_session.sid);
+ if (session) {
+ spin_lock_irqsave(&sesslock, flags);
+ list_del(&session->sess_list);
+ spin_unlock_irqrestore(&sesslock, flags);
+
+ transport->destroy_session(session);
+ } else
+ err = -EINVAL;
+ 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:
+ session = iscsi_session_lookup(ev->u.b_conn.sid);
+ conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
+
+ if (session && conn)
+ ev->r.retcode = transport->bind_conn(session, conn,
+ ev->u.b_conn.transport_eph,
+ ev->u.b_conn.is_leading);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_SET_PARAM:
+ err = iscsi_set_param(transport, ev);
+ break;
+ case ISCSI_UEVENT_START_CONN:
+ conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
+ if (conn)
+ ev->r.retcode = transport->start_conn(conn);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_STOP_CONN:
+ conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
+ if (conn)
+ transport->stop_conn(conn, ev->u.stop_conn.flag);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_SEND_PDU:
+ conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
+ if (conn)
+ ev->r.retcode = transport->send_pdu(conn,
+ (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
+ (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
+ ev->u.send_pdu.data_size);
+ else
+ err = -EINVAL;
+ break;
+ case ISCSI_UEVENT_GET_STATS:
+ err = iscsi_if_get_stats(transport, nlh);
+ break;
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
+ case ISCSI_UEVENT_TRANSPORT_EP_POLL:
+ case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+ err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ module_put(transport->owner);
+ return err;
+}
+
+/*
+ * Get message from skb (based on rtnetlink_rcv_skb). Each message is
+ * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or
+ * invalid creds are discarded silently.
+ */
+static void
+iscsi_if_rx(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+
+ mutex_lock(&rx_queue_mutex);
+ while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+ if (NETLINK_CREDS(skb)->uid) {
+ skb_pull(skb, skb->len);
+ goto free_skb;
+ }
+
+ 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);
+ }
+free_skb:
+ kfree_skb(skb);
+ }
+ mutex_unlock(&rx_queue_mutex);
+}
+
+#define iscsi_cdev_to_conn(_cdev) \
+ iscsi_dev_to_conn(_cdev->dev)
+
+#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
+struct class_device_attribute class_device_attr_##_prefix##_##_name = \
+ __ATTR(_name,_mode,_show,_store)
+
+/*
+ * iSCSI connection attrs
+ */
+#define iscsi_conn_int_attr_show(param, format) \
static ssize_t \
-show_session_str_##field(struct class_device *cdev, char *buf) \
+show_conn_int_param_##param(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); \
+ uint32_t value = 0; \
+ struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
+ struct iscsi_transport *t = conn->transport; \
\
- if (i->fnt->get_##field) \
- ret = i->fnt->get_##field(starget, buf, PAGE_SIZE); \
- return ret; \
+ t->get_conn_param(conn, param, &value); \
+ return snprintf(buf, 20, format"\n", value); \
+}
+
+#define iscsi_conn_int_attr(field, param, format) \
+ iscsi_conn_int_attr_show(param, format) \
+static ISCSI_CLASS_ATTR(conn, 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_conn_int_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT, "%d");
+iscsi_conn_int_attr(port, ISCSI_PARAM_CONN_PORT, "%d");
+iscsi_conn_int_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN, "%u");
+
+#define iscsi_conn_str_attr_show(param) \
+static ssize_t \
+show_conn_str_param_##param(struct class_device *cdev, char *buf) \
+{ \
+ struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
+ struct iscsi_transport *t = conn->transport; \
+ return t->get_conn_str_param(conn, param, buf); \
}
-#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);
+#define iscsi_conn_str_attr(field, param) \
+ iscsi_conn_str_attr_show(param) \
+static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_str_param_##param, \
+ NULL);
-iscsi_session_rd_str_attr(target_name);
-iscsi_session_rd_str_attr(target_alias);
+iscsi_conn_str_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
+iscsi_conn_str_attr(address, ISCSI_PARAM_CONN_ADDRESS);
+
+#define iscsi_cdev_to_session(_cdev) \
+ iscsi_dev_to_session(_cdev->dev)
/*
- * iSCSI host attrs
+ * 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_cls_session *session = iscsi_cdev_to_session(cdev); \
+ struct iscsi_transport *t = session->transport; \
+ \
+ t->get_session_param(session, param, &value); \
+ return snprintf(buf, 20, format"\n", value); \
+}
+
+#define iscsi_session_int_attr(field, param, format) \
+ iscsi_session_int_attr_show(param, format) \
+static ISCSI_CLASS_ATTR(sess, 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");
+iscsi_session_int_attr(tpgt, ISCSI_PARAM_TPGT, "%d");
+
+#define iscsi_session_str_attr_show(param) \
+static ssize_t \
+show_session_str_param_##param(struct class_device *cdev, char *buf) \
+{ \
+ struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
+ struct iscsi_transport *t = session->transport; \
+ return t->get_session_str_param(session, param, buf); \
+}
+
+#define iscsi_session_str_attr(field, param) \
+ iscsi_session_str_attr_show(param) \
+static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_str_param_##param, \
+ NULL);
+
+iscsi_session_str_attr(targetname, ISCSI_PARAM_TARGET_NAME);
/*
- * 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.
+ * Private session and conn attrs. userspace uses several iscsi values
+ * to identify each session between reboots. Some of these values may not
+ * be present in the iscsi_transport/LLD driver becuase userspace handles
+ * login (and failback for login redirect) so for these type of drivers
+ * the class manages the attrs and values for the iscsi_transport/LLD
*/
-#define iscsi_host_show_str_fn(field) \
- \
+#define iscsi_priv_session_attr_show(field, format) \
static ssize_t \
-show_host_str_##field(struct class_device *cdev, char *buf) \
+show_priv_session_##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; \
+ struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
+ return sprintf(buf, format"\n", session->field); \
}
-#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_priv_session_attr(field, format) \
+ iscsi_priv_session_attr_show(field, format) \
+static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
+ NULL)
+iscsi_priv_session_attr(targetname, "%s");
+iscsi_priv_session_attr(tpgt, "%d");
+iscsi_priv_session_attr(recovery_tmo, "%d");
-iscsi_host_rd_str_attr(initiator_name);
-iscsi_host_rd_str_attr(initiator_alias);
+#define iscsi_priv_conn_attr_show(field, format) \
+static ssize_t \
+show_priv_conn_##field(struct class_device *cdev, char *buf) \
+{ \
+ struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
+ return sprintf(buf, format"\n", conn->field); \
+}
-#define SETUP_SESSION_RD_ATTR(field) \
- if (i->fnt->show_##field) { \
- i->session_attrs[count] = &class_device_attr_##field; \
+#define iscsi_priv_conn_attr(field, format) \
+ iscsi_priv_conn_attr_show(field, format) \
+static ISCSI_CLASS_ATTR(priv_conn, field, S_IRUGO, show_priv_conn_##field, \
+ NULL)
+iscsi_priv_conn_attr(persistent_address, "%s");
+iscsi_priv_conn_attr(persistent_port, "%d");
+
+#define SETUP_PRIV_SESSION_RD_ATTR(field) \
+do { \
+ priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
+ count++; \
+} while (0)
+
+#define SETUP_SESSION_RD_ATTR(field, param_flag) \
+do { \
+ if (tt->param_mask & param_flag) { \
+ priv->session_attrs[count] = &class_device_attr_sess_##field; \
count++; \
- }
+ } \
+} while (0)
-#define SETUP_HOST_RD_ATTR(field) \
- if (i->fnt->show_##field) { \
- i->host_attrs[count] = &class_device_attr_##field; \
+#define SETUP_PRIV_CONN_RD_ATTR(field) \
+do { \
+ priv->conn_attrs[count] = &class_device_attr_priv_conn_##field; \
+ count++; \
+} while (0)
+
+#define SETUP_CONN_RD_ATTR(field, param_flag) \
+do { \
+ if (tt->param_mask & param_flag) { \
+ priv->conn_attrs[count] = &class_device_attr_conn_##field; \
count++; \
- }
+ } \
+} while (0)
-static int iscsi_host_match(struct attribute_container *cont,
- struct device *dev)
+static int iscsi_session_match(struct attribute_container *cont,
+ struct device *dev)
{
+ struct iscsi_cls_session *session;
struct Scsi_Host *shost;
- struct iscsi_internal *i;
+ struct iscsi_internal *priv;
- if (!scsi_is_host_device(dev))
+ if (!iscsi_is_session_dev(dev))
return 0;
- shost = dev_to_shost(dev);
- if (!shost->transportt || shost->transportt->host_attrs.ac.class
- != &iscsi_host_class.class)
+ session = iscsi_dev_to_session(dev);
+ shost = iscsi_session_to_shost(session);
+ if (!shost->transportt)
+ return 0;
+
+ priv = to_iscsi_internal(shost->transportt);
+ if (priv->session_cont.ac.class != &iscsi_session_class.class)
+ return 0;
+
+ return &priv->session_cont.ac == cont;
+}
+
+static int iscsi_conn_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct iscsi_cls_session *session;
+ struct iscsi_cls_conn *conn;
+ struct Scsi_Host *shost;
+ struct iscsi_internal *priv;
+
+ if (!iscsi_is_conn_dev(dev))
+ return 0;
+
+ conn = iscsi_dev_to_conn(dev);
+ session = iscsi_dev_to_session(conn->dev.parent);
+ shost = iscsi_session_to_shost(session);
+
+ if (!shost->transportt)
+ return 0;
+
+ 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.host_attrs.ac == cont;
+ return &priv->conn_cont.ac == cont;
}
-static int iscsi_target_match(struct attribute_container *cont,
+static int iscsi_host_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
- struct iscsi_internal *i;
+ struct iscsi_internal *priv;
- if (!scsi_is_target_device(dev))
+ if (!scsi_is_host_device(dev))
return 0;
- shost = dev_to_shost(dev->parent);
- if (!shost->transportt || shost->transportt->host_attrs.ac.class
- != &iscsi_host_class.class)
+ 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.target_attrs.ac == cont;
+ priv = to_iscsi_internal(shost->transportt);
+ return &priv->t.host_attrs.ac == cont;
}
struct scsi_transport_template *
-iscsi_attach_transport(struct iscsi_function_template *fnt)
+iscsi_register_transport(struct iscsi_transport *tt)
{
- struct iscsi_internal *i = kmalloc(sizeof(struct iscsi_internal),
- GFP_KERNEL);
- int count = 0;
+ struct iscsi_internal *priv;
+ unsigned long flags;
+ int count = 0, err;
+
+ BUG_ON(!tt);
+
+ priv = iscsi_if_transport_lookup(tt);
+ if (priv)
+ return NULL;
- if (unlikely(!i))
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
return NULL;
+ INIT_LIST_HEAD(&priv->list);
+ priv->iscsi_transport = tt;
+ priv->t.user_scan = iscsi_user_scan;
- 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);
+ priv->cdev.class = &iscsi_transport_class;
+ snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
+ err = class_device_register(&priv->cdev);
+ if (err)
+ goto free_priv;
- BUG_ON(count > ISCSI_SESSION_ATTRS);
- i->session_attrs[count] = NULL;
+ err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
+ if (err)
+ goto unregister_cdev;
+
+ /* host parameters */
+ priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
+ priv->t.host_attrs.ac.class = &iscsi_host_class.class;
+ priv->t.host_attrs.ac.match = iscsi_host_match;
+ priv->t.host_size = sizeof(struct iscsi_host);
+ priv->host_attrs[0] = NULL;
+ transport_container_register(&priv->t.host_attrs);
+
+ /* 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);
- 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;
+ SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
+ SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
+ SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
+ SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
+ SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
+ SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
+ SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
+ SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
+ SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
+ if (tt->param_mask & ISCSI_PERSISTENT_ADDRESS)
+ SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
+ else
+ SETUP_PRIV_CONN_RD_ATTR(persistent_address);
+
+ if (tt->param_mask & ISCSI_PERSISTENT_PORT)
+ SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
+ else
+ SETUP_PRIV_CONN_RD_ATTR(persistent_port);
+
+ BUG_ON(count > ISCSI_CONN_ATTRS);
+ priv->conn_attrs[count] = NULL;
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;
+ /* 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_INITIAL_R2T_EN);
+ SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
+ SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
+ SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
+ SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
+ SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
+ SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
+ SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
+ SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
+
+ if (tt->param_mask & ISCSI_TARGET_NAME)
+ SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
+ else
+ SETUP_PRIV_SESSION_RD_ATTR(targetname);
+
+ if (tt->param_mask & ISCSI_TPGT)
+ SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
+ else
+ SETUP_PRIV_SESSION_RD_ATTR(tpgt);
+
+ BUG_ON(count > ISCSI_SESSION_ATTRS);
+ priv->session_attrs[count] = NULL;
+
+ spin_lock_irqsave(&iscsi_transport_lock, flags);
+ list_add(&priv->list, &iscsi_transports);
+ spin_unlock_irqrestore(&iscsi_transport_lock, flags);
+
+ printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
+ return &priv->t;
- return &i->t;
+unregister_cdev:
+ class_device_unregister(&priv->cdev);
+free_priv:
+ kfree(priv);
+ return NULL;
}
+EXPORT_SYMBOL_GPL(iscsi_register_transport);
+
+int iscsi_unregister_transport(struct iscsi_transport *tt)
+{
+ struct iscsi_internal *priv;
+ unsigned long flags;
+
+ BUG_ON(!tt);
-EXPORT_SYMBOL(iscsi_attach_transport);
+ mutex_lock(&rx_queue_mutex);
-void iscsi_release_transport(struct scsi_transport_template *t)
+ priv = iscsi_if_transport_lookup(tt);
+ BUG_ON (!priv);
+
+ 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);
+ transport_container_unregister(&priv->t.host_attrs);
+
+ sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
+ class_device_unregister(&priv->cdev);
+ mutex_unlock(&rx_queue_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
+
+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;
- transport_container_unregister(&i->t.target_attrs);
- transport_container_unregister(&i->t.host_attrs);
-
- kfree(i);
+ if (event == NETLINK_URELEASE &&
+ n->protocol == NETLINK_ISCSI && n->pid) {
+ struct iscsi_cls_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);
+ }
+
+ 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 = class_register(&iscsi_transport_class);
if (err)
return err;
- return transport_class_register(&iscsi_host_class);
+
+ err = transport_class_register(&iscsi_host_class);
+ if (err)
+ goto unregister_transport_class;
+
+ err = transport_class_register(&iscsi_connection_class);
+ if (err)
+ goto unregister_host_class;
+
+ err = transport_class_register(&iscsi_session_class);
+ if (err)
+ goto unregister_conn_class;
+
+ err = netlink_register_notifier(&iscsi_nl_notifier);
+ if (err)
+ goto unregister_session_class;
+
+ nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
+ THIS_MODULE);
+ if (!nls) {
+ err = -ENOBUFS;
+ goto unregister_notifier;
+ }
+
+ z_reply = mempool_zone_init(Z_MAX_REPLY,
+ NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
+ if (z_reply)
+ return 0;
+
+ sock_release(nls->sk_socket);
+unregister_notifier:
+ netlink_unregister_notifier(&iscsi_nl_notifier);
+unregister_session_class:
+ transport_class_unregister(&iscsi_session_class);
+unregister_conn_class:
+ transport_class_unregister(&iscsi_connection_class);
+unregister_host_class:
+ transport_class_unregister(&iscsi_host_class);
+unregister_transport_class:
+ class_unregister(&iscsi_transport_class);
+ return err;
}
static void __exit iscsi_transport_exit(void)
{
+ mempool_zone_destroy(z_reply);
+ sock_release(nls->sk_socket);
+ netlink_unregister_notifier(&iscsi_nl_notifier);
+ transport_class_unregister(&iscsi_connection_class);
+ transport_class_unregister(&iscsi_session_class);
transport_class_unregister(&iscsi_host_class);
- transport_class_unregister(&iscsi_transport_class);
+ 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_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");
git://git.onelab.eu / linux-2.6.git / blobdiff