11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * iSCSI transport class definitions 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) IBM Corporation, 2004 539e84790SAlex Aizman * Copyright (C) Mike Christie, 2004 - 2005 639e84790SAlex Aizman * Copyright (C) Dmitry Yusupov, 2004 - 2005 739e84790SAlex Aizman * Copyright (C) Alex Aizman, 2004 - 2005 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 101da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 111da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 121da177e4SLinus Torvalds * (at your option) any later version. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 151da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 161da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 171da177e4SLinus Torvalds * GNU General Public License for more details. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 201da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 211da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 221da177e4SLinus Torvalds */ 231da177e4SLinus Torvalds #ifndef SCSI_TRANSPORT_ISCSI_H 241da177e4SLinus Torvalds #define SCSI_TRANSPORT_ISCSI_H 251da177e4SLinus Torvalds 267b8631b5SMike Christie #include <linux/device.h> 2739e84790SAlex Aizman #include <scsi/iscsi_if.h> 281da177e4SLinus Torvalds 297b8631b5SMike Christie struct scsi_transport_template; 307b8631b5SMike Christie struct Scsi_Host; 317b8631b5SMike Christie struct mempool_zone; 327b8631b5SMike Christie struct iscsi_cls_conn; 337b8631b5SMike Christie 3439e84790SAlex Aizman /** 3539e84790SAlex Aizman * struct iscsi_transport - iSCSI Transport template 3639e84790SAlex Aizman * 3739e84790SAlex Aizman * @name: transport name 3839e84790SAlex Aizman * @caps: iSCSI Data-Path capabilities 3939e84790SAlex Aizman * @create_session: create new iSCSI session object 4039e84790SAlex Aizman * @destroy_session: destroy existing iSCSI session object 4139e84790SAlex Aizman * @create_conn: create new iSCSI connection 4239e84790SAlex Aizman * @bind_conn: associate this connection with existing iSCSI session 4339e84790SAlex Aizman * and specified transport descriptor 4439e84790SAlex Aizman * @destroy_conn: destroy inactive iSCSI connection 4539e84790SAlex Aizman * @set_param: set iSCSI Data-Path operational parameter 4639e84790SAlex Aizman * @start_conn: set connection to be operational 4739e84790SAlex Aizman * @stop_conn: suspend/recover/terminate connection 4839e84790SAlex Aizman * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 4939e84790SAlex Aizman * 5039e84790SAlex Aizman * Template API provided by iSCSI Transport 5139e84790SAlex Aizman */ 5239e84790SAlex Aizman struct iscsi_transport { 5339e84790SAlex Aizman struct module *owner; 5439e84790SAlex Aizman char *name; 5539e84790SAlex Aizman unsigned int caps; 5639e84790SAlex Aizman struct scsi_host_template *host_template; 577b8631b5SMike Christie /* LLD session/scsi_host data size */ 5839e84790SAlex Aizman int hostdata_size; 597b8631b5SMike Christie /* LLD iscsi_host data size */ 607b8631b5SMike Christie int ihostdata_size; 617b8631b5SMike Christie /* LLD connection data size */ 627b8631b5SMike Christie int conndata_size; 6339e84790SAlex Aizman int max_lun; 6439e84790SAlex Aizman unsigned int max_conn; 6539e84790SAlex Aizman unsigned int max_cmd_len; 667b8631b5SMike Christie struct Scsi_Host *(*create_session) (struct scsi_transport_template *t, 677b8631b5SMike Christie uint32_t initial_cmdsn); 687b8631b5SMike Christie void (*destroy_session) (struct Scsi_Host *shost); 697b8631b5SMike Christie struct iscsi_cls_conn *(*create_conn) (struct Scsi_Host *shost, 707b8631b5SMike Christie uint32_t cid); 7139e84790SAlex Aizman int (*bind_conn) (iscsi_sessionh_t session, iscsi_connh_t conn, 7239e84790SAlex Aizman uint32_t transport_fd, int is_leading); 7339e84790SAlex Aizman int (*start_conn) (iscsi_connh_t conn); 7439e84790SAlex Aizman void (*stop_conn) (iscsi_connh_t conn, int flag); 757b8631b5SMike Christie void (*destroy_conn) (struct iscsi_cls_conn *conn); 7639e84790SAlex Aizman int (*set_param) (iscsi_connh_t conn, enum iscsi_param param, 7739e84790SAlex Aizman uint32_t value); 787b8631b5SMike Christie int (*get_conn_param) (void *conndata, enum iscsi_param param, 7939e84790SAlex Aizman uint32_t *value); 807b8631b5SMike Christie int (*get_session_param) (struct Scsi_Host *shost, 817b8631b5SMike Christie enum iscsi_param param, uint32_t *value); 8239e84790SAlex Aizman int (*send_pdu) (iscsi_connh_t conn, struct iscsi_hdr *hdr, 8339e84790SAlex Aizman char *data, uint32_t data_size); 8439e84790SAlex Aizman void (*get_stats) (iscsi_connh_t conn, struct iscsi_stats *stats); 851da177e4SLinus Torvalds }; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* 8839e84790SAlex Aizman * transport registration upcalls 891da177e4SLinus Torvalds */ 907b8631b5SMike Christie extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 9139e84790SAlex Aizman extern int iscsi_unregister_transport(struct iscsi_transport *tt); 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* 9439e84790SAlex Aizman * control plane upcalls 951da177e4SLinus Torvalds */ 9639e84790SAlex Aizman extern void iscsi_conn_error(iscsi_connh_t conn, enum iscsi_err error); 9739e84790SAlex Aizman extern int iscsi_recv_pdu(iscsi_connh_t conn, struct iscsi_hdr *hdr, 9839e84790SAlex Aizman char *data, uint32_t data_size); 991da177e4SLinus Torvalds 1007b8631b5SMike Christie struct iscsi_cls_conn { 1017b8631b5SMike Christie struct list_head conn_list; /* item in connlist */ 1027b8631b5SMike Christie void *dd_data; /* LLD private data */ 1037b8631b5SMike Christie struct iscsi_transport *transport; 1047b8631b5SMike Christie iscsi_connh_t connh; 1057b8631b5SMike Christie int active; /* must be accessed with the connlock */ 1067b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 1077b8631b5SMike Christie struct mempool_zone *z_error; 1087b8631b5SMike Christie struct mempool_zone *z_pdu; 1097b8631b5SMike Christie struct list_head freequeue; 1107b8631b5SMike Christie }; 1117b8631b5SMike Christie 1127b8631b5SMike Christie #define iscsi_dev_to_conn(_dev) \ 1137b8631b5SMike Christie container_of(_dev, struct iscsi_cls_conn, dev) 1147b8631b5SMike Christie 1157b8631b5SMike Christie struct iscsi_cls_session { 1167b8631b5SMike Christie struct list_head list; /* item in session_list */ 1177b8631b5SMike Christie struct iscsi_transport *transport; 1187b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 1197b8631b5SMike Christie }; 1207b8631b5SMike Christie 1217b8631b5SMike Christie #define iscsi_dev_to_session(_dev) \ 1227b8631b5SMike Christie container_of(_dev, struct iscsi_cls_session, dev) 1237b8631b5SMike Christie 1247b8631b5SMike Christie #define iscsi_session_to_shost(_session) \ 1257b8631b5SMike Christie dev_to_shost(_session->dev.parent) 1267b8631b5SMike Christie 1277b8631b5SMike Christie /* 1287b8631b5SMike Christie * session and connection functions that can be used by HW iSCSI LLDs 1297b8631b5SMike Christie */ 1307b8631b5SMike Christie extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 1317b8631b5SMike Christie struct iscsi_transport *t); 1327b8631b5SMike Christie extern int iscsi_destroy_session(struct iscsi_cls_session *session); 1337b8631b5SMike Christie extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 1347b8631b5SMike Christie uint32_t cid); 1357b8631b5SMike Christie extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 1367b8631b5SMike Christie 1377b8631b5SMike Christie /* 1387b8631b5SMike Christie * session functions used by software iscsi 1397b8631b5SMike Christie */ 1407b8631b5SMike Christie extern struct Scsi_Host * 1417b8631b5SMike Christie iscsi_transport_create_session(struct scsi_transport_template *scsit, 1427b8631b5SMike Christie struct iscsi_transport *transport); 1437b8631b5SMike Christie extern int iscsi_transport_destroy_session(struct Scsi_Host *shost); 1447b8631b5SMike Christie 1451da177e4SLinus Torvalds #endif 146