[SCSI] scsi_transport_iscsi: Add conn login, kernel to user, event to support offload session login.

Offload drivers like qla4xxx will offload the sending of the login/logout
pdus still, so this patch adds iscsi_conn_login_event which is
used by these types of drivers to notify userspace that the connection
has changed state.

It also adds a iscsi_is_session_online helper so the lld
can query the sessions state field.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 20 insertions, 0 deletions

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index d3f256a232f8..629ca42dfe75 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -71,6 +71,7 @@ enum iscsi_uevent_e {
 
         ISCSI_KEVENT_PATH_REQ           = KEVENT_BASE + 7,
         ISCSI_KEVENT_IF_DOWN            = KEVENT_BASE + 8,
+        ISCSI_KEVENT_CONN_LOGIN_STATE   = KEVENT_BASE + 9,
 };
 
 enum iscsi_tgt_dscvr {
@@ -198,6 +199,11 @@ struct iscsi_uevent {
                         uint32_t        cid;
                         uint64_t        recv_handle;
                 } recv_req;
+                struct msg_conn_login {
+                        uint32_t        sid;
+                        uint32_t        cid;
+                        uint32_t        state; /* enum iscsi_conn_state */
+                } conn_login;
                 struct msg_conn_error {
                         uint32_t        sid;
                         uint32_t        cid;
@@ -309,6 +315,16 @@ enum iscsi_net_param {
         ISCSI_NET_PARAM_IFACE_NAME              = 17,
 };
 
+enum iscsi_conn_state {
+        ISCSI_CONN_STATE_FREE,
+        ISCSI_CONN_STATE_XPT_WAIT,
+        ISCSI_CONN_STATE_IN_LOGIN,
+        ISCSI_CONN_STATE_LOGGED_IN,
+        ISCSI_CONN_STATE_IN_LOGOUT,
+        ISCSI_CONN_STATE_LOGOUT_REQUESTED,
+        ISCSI_CONN_STATE_CLEANUP_WAIT,
+};
+
 /*
  * Common error codes
  */
@@ -421,6 +437,7 @@ enum iscsi_host_param {
 #define CAP_DIGEST_OFFLOAD      0x1000  /* offload hdr and data digests */
 #define CAP_PADDING_OFFLOAD     0x2000  /* offload padding insertion, removal,
                                          and verification */
+#define CAP_LOGIN_OFFLOAD       0x4000  /* offload session login */
 
 /*
  * These flags describes reason of stop_conn() call
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 4a3edeeae8f6..3389cd5ea94c 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -156,6 +156,8 @@ extern int iscsi_unregister_transport(struct iscsi_transport *tt);
  */
 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
                                    enum iscsi_err error);
+extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
+                                   enum iscsi_conn_state state);
 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
                           char *data, uint32_t data_size);
 
@@ -268,6 +270,7 @@ struct iscsi_iface {
         dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
 
 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
+extern int iscsi_is_session_online(struct iscsi_cls_session *session);
 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
                                 struct iscsi_transport *transport, int dd_size);
 extern int iscsi_add_session(struct iscsi_cls_session *session,