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path: root/drivers/scsi/scsi_transport_iscsi.c
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Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c106
1 files changed, 73 insertions, 33 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 2730d507e58..10ff0f0210b 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -56,6 +56,8 @@ struct iscsi_internal {
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
@@ -165,14 +167,23 @@ static DEFINE_SPINLOCK(sesslock);
static LIST_HEAD(connlist);
static DEFINE_SPINLOCK(connlock);
-static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle)
+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;
+}
+
+/*
+ * 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;
spin_lock_irqsave(&sesslock, flags);
list_for_each_entry(sess, &sesslist, sess_list) {
- if (sess == iscsi_ptr(handle)) {
+ if (sess->sid == sid) {
spin_unlock_irqrestore(&sesslock, flags);
return sess;
}
@@ -181,14 +192,17 @@ static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle)
return NULL;
}
-static struct iscsi_cls_conn *iscsi_conn_lookup(uint64_t handle)
+/*
+ * 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;
spin_lock_irqsave(&connlock, flags);
list_for_each_entry(conn, &connlist, conn_list) {
- if (conn == iscsi_ptr(handle)) {
+ if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
spin_unlock_irqrestore(&connlock, flags);
return conn;
}
@@ -223,7 +237,7 @@ static int iscsi_is_session_dev(const struct device *dev)
* @shost: scsi host
* @transport: iscsi transport
*
- * This can be called from a LLD or 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)
@@ -234,14 +248,20 @@ iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport)
if (!try_module_get(transport->owner))
return NULL;
- session = kzalloc(sizeof(*session), GFP_KERNEL);
+ session = kzalloc(sizeof(*session) + transport->sessiondata_size,
+ GFP_KERNEL);
if (!session)
goto module_put;
session->transport = transport;
+ if (transport->sessiondata_size)
+ session->dd_data = &session[1];
+
/* 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->sid = iscsi_session_nr++;
+ 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);
@@ -301,12 +321,16 @@ static int iscsi_is_conn_dev(const struct device *dev)
* 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 iscsi_transport *transport = session->transport;
- struct Scsi_Host *shost = iscsi_session_to_shost(session);
struct iscsi_cls_conn *conn;
int err;
@@ -319,12 +343,14 @@ iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
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",
- shost->host_no, cid);
+ session->sid, cid);
conn->dev.parent = &session->dev;
conn->dev.release = iscsi_conn_release;
err = device_register(&conn->dev);
@@ -607,7 +633,8 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
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 = iscsi_handle(conn);
+ 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);
@@ -639,7 +666,8 @@ void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err 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 = iscsi_handle(conn);
+ ev->r.connerror.cid = conn->cid;
+ ev->r.connerror.sid = iscsi_conn_get_sid(conn);
iscsi_unicast_skb(conn->z_error, skb);
@@ -689,7 +717,7 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
ISCSI_STATS_CUSTOM_MAX);
int err = 0;
- conn = iscsi_conn_lookup(ev->u.get_stats.conn_handle);
+ conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
if (!conn)
return -EEXIST;
@@ -713,8 +741,10 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
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;
+ 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));
@@ -740,16 +770,16 @@ iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
{
struct iscsi_transport *transport = priv->iscsi_transport;
struct iscsi_cls_session *session;
- uint32_t sid;
+ uint32_t hostno;
session = transport->create_session(&priv->t,
ev->u.c_session.initial_cmdsn,
- &sid);
+ &hostno);
if (!session)
return -ENOMEM;
- ev->r.c_session_ret.session_handle = iscsi_handle(session);
- ev->r.c_session_ret.sid = sid;
+ ev->r.c_session_ret.host_no = hostno;
+ ev->r.c_session_ret.sid = session->sid;
return 0;
}
@@ -760,13 +790,20 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
struct iscsi_cls_session *session;
unsigned long flags;
- session = iscsi_session_lookup(ev->u.c_conn.session_handle);
- if (!session)
+ 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)
+ 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) +
@@ -788,7 +825,8 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
goto free_pdu_pool;
}
- ev->r.handle = iscsi_handle(conn);
+ 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);
@@ -812,7 +850,7 @@ iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev
struct iscsi_cls_conn *conn;
struct mempool_zone *z_error, *z_pdu;
- conn = iscsi_conn_lookup(ev->u.d_conn.conn_handle);
+ conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
if (!conn)
return -EINVAL;
spin_lock_irqsave(&connlock, flags);
@@ -855,7 +893,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
err = iscsi_if_create_session(priv, ev);
break;
case ISCSI_UEVENT_DESTROY_SESSION:
- session = iscsi_session_lookup(ev->u.d_session.session_handle);
+ session = iscsi_session_lookup(ev->u.d_session.sid);
if (session)
transport->destroy_session(session);
else
@@ -868,8 +906,8 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
err = iscsi_if_destroy_conn(transport, ev);
break;
case ISCSI_UEVENT_BIND_CONN:
- session = iscsi_session_lookup(ev->u.b_conn.session_handle);
- conn = iscsi_conn_lookup(ev->u.b_conn.conn_handle);
+ 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,
@@ -879,7 +917,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
err = -EINVAL;
break;
case ISCSI_UEVENT_SET_PARAM:
- conn = iscsi_conn_lookup(ev->u.set_param.conn_handle);
+ conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
if (conn)
ev->r.retcode = transport->set_param(conn,
ev->u.set_param.param, ev->u.set_param.value);
@@ -887,7 +925,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
err = -EINVAL;
break;
case ISCSI_UEVENT_START_CONN:
- conn = iscsi_conn_lookup(ev->u.start_conn.conn_handle);
+ conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
if (conn)
ev->r.retcode = transport->start_conn(conn);
else
@@ -895,14 +933,14 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break;
case ISCSI_UEVENT_STOP_CONN:
- conn = iscsi_conn_lookup(ev->u.stop_conn.conn_handle);
+ 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.conn_handle);
+ 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)),
@@ -923,9 +961,11 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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
- * or invalid creds discarded silently. */
+/*
+ * 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)
{
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-30 23:18:22 +0000