#define ISCSI_TRANSPORT_VERSION "2.0-870"
+static int dbg_session;
+module_param_named(debug_session, dbg_session, int,
+ S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug_session,
+ "Turn on debugging for sessions in scsi_transport_iscsi "
+ "module. Set to 1 to turn on, and zero to turn off. Default "
+ "is off.");
+
+static int dbg_conn;
+module_param_named(debug_conn, dbg_conn, int,
+ S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug_conn,
+ "Turn on debugging for connections in scsi_transport_iscsi "
+ "module. Set to 1 to turn on, and zero to turn off. Default "
+ "is off.");
+
+#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
+ do { \
+ if (dbg_session) \
+ iscsi_cls_session_printk(KERN_INFO, _session, \
+ "%s: " dbg_fmt, \
+ __func__, ##arg); \
+ } while (0);
+
+#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
+ do { \
+ if (dbg_conn) \
+ iscsi_cls_conn_printk(KERN_INFO, _conn, \
+ "%s: " dbg_fmt, \
+ __func__, ##arg); \
+ } while (0);
+
struct iscsi_internal {
- int daemon_pid;
struct scsi_transport_template t;
struct iscsi_transport *iscsi_transport;
struct list_head list;
memset(ihost, 0, sizeof(*ihost));
atomic_set(&ihost->nr_scans, 0);
mutex_init(&ihost->mutex);
-
- snprintf(ihost->scan_workq_name, sizeof(ihost->scan_workq_name),
- "iscsi_scan_%d", shost->host_no);
- ihost->scan_workq = create_singlethread_workqueue(
- ihost->scan_workq_name);
- if (!ihost->scan_workq)
- return -ENOMEM;
- return 0;
-}
-
-static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
- struct device *cdev)
-{
- struct Scsi_Host *shost = dev_to_shost(dev);
- struct iscsi_cls_host *ihost = shost->shost_data;
-
- destroy_workqueue(ihost->scan_workq);
return 0;
}
static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
"iscsi_host",
iscsi_setup_host,
- iscsi_remove_host,
+ NULL,
NULL);
static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
err = 0;
break;
case ISCSI_SESSION_FAILED:
- err = DID_TRANSPORT_DISRUPTED << 16;
+ err = DID_IMM_RETRY << 16;
break;
case ISCSI_SESSION_FREE:
err = DID_TRANSPORT_FAILFAST << 16;
shost = iscsi_session_to_shost(session);
scsi_host_put(shost);
+ ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
kfree(session);
}
return 0;
session = iscsi_dev_to_session(dev);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
+
shost = iscsi_session_to_shost(session);
ihost = shost->shost_data;
spin_lock_irqsave(&session->lock, flags);
if (session->state != ISCSI_SESSION_LOGGED_IN) {
spin_unlock_irqrestore(&session->lock, flags);
- mutex_unlock(&ihost->mutex);
- return 0;
+ goto user_scan_exit;
}
id = session->target_id;
spin_unlock_irqrestore(&session->lock, flags);
scsi_scan_target(&session->dev, 0, id,
scan_data->lun, 1);
}
+
+user_scan_exit:
mutex_unlock(&ihost->mutex);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
return 0;
}
if (session->transport->session_recovery_timedout)
session->transport->session_recovery_timedout(session);
+ ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
scsi_target_unblock(&session->dev);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
}
static void __iscsi_unblock_session(struct work_struct *work)
struct iscsi_cls_host *ihost = shost->shost_data;
unsigned long flags;
+ ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
/*
* The recovery and unblock work get run from the same workqueue,
* so try to cancel it if it was going to run after this unblock.
* scanning from userspace).
*/
if (shost->hostt->scan_finished) {
- if (queue_work(ihost->scan_workq, &session->scan_work))
+ if (scsi_queue_work(shost, &session->scan_work))
atomic_inc(&ihost->nr_scans);
}
+ ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
}
/**
block_work);
unsigned long flags;
+ ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
spin_lock_irqsave(&session->lock, flags);
session->state = ISCSI_SESSION_FAILED;
spin_unlock_irqrestore(&session->lock, flags);
scsi_target_block(&session->dev);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
session->recovery_tmo * HZ);
}
struct iscsi_cls_host *ihost = shost->shost_data;
unsigned long flags;
+ ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
+
/* Prevent new scans and make sure scanning is not in progress */
mutex_lock(&ihost->mutex);
spin_lock_irqsave(&session->lock, flags);
scsi_remove_target(&session->dev);
iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
-}
-
-static int iscsi_unbind_session(struct iscsi_cls_session *session)
-{
- struct Scsi_Host *shost = iscsi_session_to_shost(session);
- struct iscsi_cls_host *ihost = shost->shost_data;
-
- return queue_work(ihost->scan_workq, &session->unbind_work);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
}
struct iscsi_cls_session *
device_initialize(&session->dev);
if (dd_size)
session->dd_data = &session[1];
+
+ ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
return session;
}
EXPORT_SYMBOL_GPL(iscsi_alloc_session);
"Too many iscsi targets. Max "
"number of targets is %d.\n",
ISCSI_MAX_TARGET - 1);
+ err = -EOVERFLOW;
goto release_host;
}
}
spin_unlock_irqrestore(&sesslock, flags);
iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
+ ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
return 0;
release_host:
struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
struct device *parent = conn->dev.parent;
+ ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
kfree(conn);
put_device(parent);
}
void iscsi_remove_session(struct iscsi_cls_session *session)
{
struct Scsi_Host *shost = iscsi_session_to_shost(session);
- struct iscsi_cls_host *ihost = shost->shost_data;
unsigned long flags;
int err;
+ ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
+
spin_lock_irqsave(&sesslock, flags);
list_del(&session->sess_list);
spin_unlock_irqrestore(&sesslock, flags);
scsi_target_unblock(&session->dev);
/* flush running scans then delete devices */
- flush_workqueue(ihost->scan_workq);
+ scsi_flush_work(shost);
__iscsi_unbind_session(&session->unbind_work);
/* hw iscsi may not have removed all connections from session */
"for session. Error %d.\n", err);
transport_unregister_device(&session->dev);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
device_del(&session->dev);
}
EXPORT_SYMBOL_GPL(iscsi_remove_session);
void iscsi_free_session(struct iscsi_cls_session *session)
{
+ ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
put_device(&session->dev);
}
int iscsi_destroy_session(struct iscsi_cls_session *session)
{
iscsi_remove_session(session);
+ ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
iscsi_free_session(session);
return 0;
}
list_add(&conn->conn_list, &connlist);
conn->active = 1;
spin_unlock_irqrestore(&connlock, flags);
+
+ ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
return conn;
release_parent_ref:
spin_unlock_irqrestore(&connlock, flags);
transport_unregister_device(&conn->dev);
+ ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
device_unregister(&conn->dev);
return 0;
}
}
static int
-iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
+iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
{
- int rc;
-
- rc = netlink_broadcast(nls, skb, 0, 1, gfp);
- if (rc < 0) {
- printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
- return rc;
- }
-
- return 0;
-}
-
-static int
-iscsi_unicast_skb(struct sk_buff *skb, int pid)
-{
- int rc;
-
- rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
- if (rc < 0) {
- printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
- return rc;
- }
-
- return 0;
+ return nlmsg_multicast(nls, skb, 0, group, gfp);
}
int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
return -ENOMEM;
}
- nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
memset(ev, 0, sizeof(*ev));
ev->transport_handle = iscsi_handle(conn->transport);
memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
- return iscsi_unicast_skb(skb, priv->daemon_pid);
+ return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
+int iscsi_offload_mesg(struct Scsi_Host *shost,
+ struct iscsi_transport *transport, uint32_t type,
+ char *data, uint16_t data_size)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ int len = NLMSG_SPACE(sizeof(*ev) + data_size);
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
+ return -ENOMEM;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ memset(ev, 0, sizeof(*ev));
+ ev->type = type;
+ ev->transport_handle = iscsi_handle(transport);
+ switch (type) {
+ case ISCSI_KEVENT_PATH_REQ:
+ ev->r.req_path.host_no = shost->host_no;
+ break;
+ case ISCSI_KEVENT_IF_DOWN:
+ ev->r.notify_if_down.host_no = shost->host_no;
+ break;
+ }
+
+ memcpy((char *)ev + sizeof(*ev), data, data_size);
+
+ return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
+}
+EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
+
void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
{
struct nlmsghdr *nlh;
return;
}
- nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
ev->transport_handle = iscsi_handle(conn->transport);
ev->type = ISCSI_KEVENT_CONN_ERROR;
ev->r.connerror.cid = conn->cid;
ev->r.connerror.sid = iscsi_conn_get_sid(conn);
- iscsi_broadcast_skb(skb, GFP_ATOMIC);
+ iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
error);
EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
static int
-iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
- void *payload, int size)
+iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
+ void *payload, int size)
{
struct sk_buff *skb;
struct nlmsghdr *nlh;
return -ENOMEM;
}
- nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
+ nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
nlh->nlmsg_flags = flags;
memcpy(NLMSG_DATA(nlh), payload, size);
- return iscsi_unicast_skb(skb, pid);
+ return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
}
static int
return -ENOMEM;
}
- nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
+ nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
(len - sizeof(*nlhstat)), 0);
evstat = NLMSG_DATA(nlhstat);
memset(evstat, 0, sizeof(*evstat));
skb_trim(skbstat, NLMSG_ALIGN(actual_size));
nlhstat->nlmsg_len = actual_size;
- err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
+ err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
+ GFP_ATOMIC);
} while (err < 0 && err != -ECONNREFUSED);
return err;
return -ENOMEM;
}
- nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
ev->transport_handle = iscsi_handle(session->transport);
* this will occur if the daemon is not up, so we just warn
* the user and when the daemon is restarted it will handle it
*/
- rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
- if (rc < 0)
+ rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
+ if (rc == -ESRCH)
iscsi_cls_session_printk(KERN_ERR, session,
"Cannot notify userspace of session "
"event %u. Check iscsi daemon\n",
event);
+
+ ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
+ event, rc);
return rc;
}
EXPORT_SYMBOL_GPL(iscsi_session_event);
{
struct iscsi_transport *transport = priv->iscsi_transport;
struct iscsi_cls_session *session;
- uint32_t host_no;
+ struct Scsi_Host *shost;
session = transport->create_session(ep, cmds_max, queue_depth,
- initial_cmdsn, &host_no);
+ initial_cmdsn);
if (!session)
return -ENOMEM;
- ev->r.c_session_ret.host_no = host_no;
+ shost = iscsi_session_to_shost(session);
+ ev->r.c_session_ret.host_no = shost->host_no;
ev->r.c_session_ret.sid = session->sid;
+ ISCSI_DBG_TRANS_SESSION(session,
+ "Completed creating transport session\n");
return 0;
}
ev->r.c_conn_ret.sid = session->sid;
ev->r.c_conn_ret.cid = conn->cid;
+
+ ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
return 0;
}
if (!conn)
return -EINVAL;
+ ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
if (transport->destroy_conn)
transport->destroy_conn(conn);
+
return 0;
}
return err;
}
+static int iscsi_if_ep_connect(struct iscsi_transport *transport,
+ struct iscsi_uevent *ev, int msg_type)
+{
+ struct iscsi_endpoint *ep;
+ struct sockaddr *dst_addr;
+ struct Scsi_Host *shost = NULL;
+ int non_blocking, err = 0;
+
+ if (!transport->ep_connect)
+ return -EINVAL;
+
+ if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
+ shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
+ if (!shost) {
+ printk(KERN_ERR "ep connect failed. Could not find "
+ "host no %u\n",
+ ev->u.ep_connect_through_host.host_no);
+ return -ENODEV;
+ }
+ non_blocking = ev->u.ep_connect_through_host.non_blocking;
+ } else
+ non_blocking = ev->u.ep_connect.non_blocking;
+
+ dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
+ ep = transport->ep_connect(shost, dst_addr, non_blocking);
+ if (IS_ERR(ep)) {
+ err = PTR_ERR(ep);
+ goto release_host;
+ }
+
+ ev->r.ep_connect_ret.handle = ep->id;
+release_host:
+ if (shost)
+ scsi_host_put(shost);
+ return err;
+}
+
static int
iscsi_if_transport_ep(struct iscsi_transport *transport,
struct iscsi_uevent *ev, int msg_type)
{
struct iscsi_endpoint *ep;
- struct sockaddr *dst_addr;
int rc = 0;
switch (msg_type) {
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
- if (!transport->ep_connect)
- return -EINVAL;
-
- dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
- ep = transport->ep_connect(dst_addr,
- ev->u.ep_connect.non_blocking);
- if (IS_ERR(ep))
- return PTR_ERR(ep);
-
- ev->r.ep_connect_ret.handle = ep->id;
+ rc = iscsi_if_ep_connect(transport, ev, msg_type);
break;
case ISCSI_UEVENT_TRANSPORT_EP_POLL:
if (!transport->ep_poll)
}
static int
-iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct Scsi_Host *shost;
+ struct iscsi_path *params;
+ int err;
+
+ if (!transport->set_path)
+ return -ENOSYS;
+
+ shost = scsi_host_lookup(ev->u.set_path.host_no);
+ if (!shost) {
+ printk(KERN_ERR "set path could not find host no %u\n",
+ ev->u.set_path.host_no);
+ return -ENODEV;
+ }
+
+ params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
+ err = transport->set_path(shost, params);
+
+ scsi_host_put(shost);
+ return err;
+}
+
+static int
+iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
{
int err = 0;
struct iscsi_uevent *ev = NLMSG_DATA(nlh);
struct iscsi_cls_conn *conn;
struct iscsi_endpoint *ep = NULL;
+ if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
+ *group = ISCSI_NL_GRP_UIP;
+ else
+ *group = ISCSI_NL_GRP_ISCSID;
+
priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
if (!priv)
return -EINVAL;
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, ep, ev,
case ISCSI_UEVENT_UNBIND_SESSION:
session = iscsi_session_lookup(ev->u.d_session.sid);
if (session)
- iscsi_unbind_session(session);
+ scsi_queue_work(iscsi_session_to_shost(session),
+ &session->unbind_work);
else
err = -EINVAL;
break;
case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
case ISCSI_UEVENT_TRANSPORT_EP_POLL:
case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
+ case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
break;
case ISCSI_UEVENT_TGT_DSCVR:
case ISCSI_UEVENT_SET_HOST_PARAM:
err = iscsi_set_host_param(transport, ev);
break;
+ case ISCSI_UEVENT_PATH_UPDATE:
+ err = iscsi_set_path(transport, ev);
+ break;
default:
err = -ENOSYS;
break;
uint32_t rlen;
struct nlmsghdr *nlh;
struct iscsi_uevent *ev;
+ uint32_t group;
nlh = nlmsg_hdr(skb);
if (nlh->nlmsg_len < sizeof(*nlh) ||
if (rlen > skb->len)
rlen = skb->len;
- err = iscsi_if_recv_msg(skb, nlh);
+ err = iscsi_if_recv_msg(skb, nlh, &group);
if (err) {
ev->type = ISCSI_KEVENT_IF_ERROR;
ev->iferror = err;
*/
if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
break;
- err = iscsi_if_send_reply(
- NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
+ err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
} while (err < 0 && err != -ECONNREFUSED);
skb_pull(skb, rlen);
if (!priv)
return NULL;
INIT_LIST_HEAD(&priv->list);
- priv->daemon_pid = -1;
priv->iscsi_transport = tt;
priv->t.user_scan = iscsi_user_scan;
- if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
- priv->t.create_work_queue = 1;
+ priv->t.create_work_queue = 1;
priv->dev.class = &iscsi_transport_class;
dev_set_name(&priv->dev, "%s", tt->name);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff