2 files changed, 73 insertions, 8 deletions

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index be1bc792ab18..3e5cb5ab2d34 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -168,6 +168,12 @@ typedef uint64_t iscsi_connh_t;		/* iSCSI Data-Path connection handle */
 
 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
+#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
+
+/**
+ * iscsi_hostdata - get LLD hostdata from scsi_host
+ * @_hostdata: pointer to scsi host's hostdata
+ **/
 #define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
 
 /*
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index f25041c386ec..16602a547a63 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -23,8 +23,14 @@
 #ifndef SCSI_TRANSPORT_ISCSI_H
 #define SCSI_TRANSPORT_ISCSI_H
 
+#include <linux/device.h>
 #include <scsi/iscsi_if.h>
 
+struct scsi_transport_template;
+struct Scsi_Host;
+struct mempool_zone;
+struct iscsi_cls_conn;
+
 /**
  * struct iscsi_transport - iSCSI Transport template
  *
@@ -48,23 +54,31 @@ struct iscsi_transport {
         char *name;
         unsigned int caps;
         struct scsi_host_template *host_template;
+        /* LLD session/scsi_host data size */
         int hostdata_size;
+        /* LLD iscsi_host data size */
+        int ihostdata_size;
+        /* LLD connection data size */
+        int conndata_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);
+        struct Scsi_Host *(*create_session) (struct scsi_transport_template *t,
+                                             uint32_t initial_cmdsn);
+        void (*destroy_session) (struct Scsi_Host *shost);
+        struct iscsi_cls_conn *(*create_conn) (struct Scsi_Host *shost,
+                                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);
+        void (*destroy_conn) (struct iscsi_cls_conn *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 (*get_conn_param) (void *conndata, enum iscsi_param param,
+                               uint32_t *value);
+        int (*get_session_param) (struct Scsi_Host *shost,
+                                  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);
@@ -73,7 +87,7 @@ struct iscsi_transport {
 /*
  * transport registration upcalls
  */
-extern int iscsi_register_transport(struct iscsi_transport *tt);
+extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
 
 /*
@@ -83,4 +97,49 @@ 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);
 
+struct iscsi_cls_conn {
+        struct list_head conn_list;     /* item in connlist */
+        void *dd_data;                  /* LLD private data */
+        struct iscsi_transport *transport;
+        iscsi_connh_t connh;
+        int active;                     /* must be accessed with the connlock */
+        struct device dev;              /* sysfs transport/container device */
+        struct mempool_zone *z_error;
+        struct mempool_zone *z_pdu;
+        struct list_head freequeue;
+};
+
+#define iscsi_dev_to_conn(_dev) \
+        container_of(_dev, struct iscsi_cls_conn, dev)
+
+struct iscsi_cls_session {
+        struct list_head list;  /* item in session_list */
+        struct iscsi_transport *transport;
+        struct device dev;      /* sysfs transport/container device */
+};
+
+#define iscsi_dev_to_session(_dev) \
+        container_of(_dev, struct iscsi_cls_session, dev)
+
+#define iscsi_session_to_shost(_session) \
+        dev_to_shost(_session->dev.parent)
+
+/*
+ * session and connection functions that can be used by HW iSCSI LLDs
+ */
+extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
+                                struct iscsi_transport *t);
+extern int iscsi_destroy_session(struct iscsi_cls_session *session);
+extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
+                                            uint32_t cid);
+extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
+
+/*
+ * session functions used by software iscsi
+ */
+extern struct Scsi_Host *
+iscsi_transport_create_session(struct scsi_transport_template *scsit,
+                               struct iscsi_transport *transport);
+extern int iscsi_transport_destroy_session(struct Scsi_Host *shost);
+
 #endif