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7996a778ff
There is a lot of code duplcited between iscsi_tcp and the upcoming iscsi_iser driver. This patch puts the duplicated code in a lib. There is more code to move around but this takes care of the basics. For iscsi_offload if they use the lib we will probably move some things around. For example in the queuecommand we will not assume that the LLD wants to do queue_work, but it is better to handle that later when we know for sure what iscsi_offload looks like (we could probably do this for iscsi_iser though to). Ideally I would like to get the iscsi_transports modules to a place where all they really have to do is put data on the wire, but how to do that will hopefully be more clear when we see other modules like iscsi_offload. Or maybe iscsi_offload will not use the lib and it will just be iscsi_iser and iscsi_tcp and maybe the iscsi_tcp_tgt if that is allowed in mainline. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
293 lines
7.9 KiB
C
293 lines
7.9 KiB
C
/*
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* iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
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*
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* Copyright (C) 2005 Dmitry Yusupov
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* Copyright (C) 2005 Alex Aizman
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* maintained by open-iscsi@googlegroups.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* See the file COPYING included with this distribution for more details.
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*/
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#ifndef ISCSI_IF_H
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#define ISCSI_IF_H
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#include <scsi/iscsi_proto.h>
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#define UEVENT_BASE 10
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#define KEVENT_BASE 100
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#define ISCSI_ERR_BASE 1000
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enum iscsi_uevent_e {
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ISCSI_UEVENT_UNKNOWN = 0,
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/* down events */
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ISCSI_UEVENT_CREATE_SESSION = UEVENT_BASE + 1,
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ISCSI_UEVENT_DESTROY_SESSION = UEVENT_BASE + 2,
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ISCSI_UEVENT_CREATE_CONN = UEVENT_BASE + 3,
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ISCSI_UEVENT_DESTROY_CONN = UEVENT_BASE + 4,
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ISCSI_UEVENT_BIND_CONN = UEVENT_BASE + 5,
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ISCSI_UEVENT_SET_PARAM = UEVENT_BASE + 6,
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ISCSI_UEVENT_START_CONN = UEVENT_BASE + 7,
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ISCSI_UEVENT_STOP_CONN = UEVENT_BASE + 8,
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ISCSI_UEVENT_SEND_PDU = UEVENT_BASE + 9,
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ISCSI_UEVENT_GET_STATS = UEVENT_BASE + 10,
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ISCSI_UEVENT_GET_PARAM = UEVENT_BASE + 11,
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/* up events */
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ISCSI_KEVENT_RECV_PDU = KEVENT_BASE + 1,
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ISCSI_KEVENT_CONN_ERROR = KEVENT_BASE + 2,
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ISCSI_KEVENT_IF_ERROR = KEVENT_BASE + 3,
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};
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struct iscsi_uevent {
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uint32_t type; /* k/u events type */
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uint32_t iferror; /* carries interface or resource errors */
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uint64_t transport_handle;
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union {
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/* messages u -> k */
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struct msg_create_session {
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uint32_t initial_cmdsn;
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} c_session;
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struct msg_destroy_session {
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uint32_t sid;
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} d_session;
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struct msg_create_conn {
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uint32_t sid;
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uint32_t cid;
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} c_conn;
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struct msg_bind_conn {
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uint32_t sid;
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uint32_t cid;
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uint32_t transport_fd;
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uint32_t is_leading;
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} b_conn;
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struct msg_destroy_conn {
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uint32_t sid;
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uint32_t cid;
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} d_conn;
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struct msg_send_pdu {
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uint32_t sid;
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uint32_t cid;
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uint32_t hdr_size;
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uint32_t data_size;
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} send_pdu;
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struct msg_set_param {
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uint32_t sid;
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uint32_t cid;
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uint32_t param; /* enum iscsi_param */
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uint32_t len;
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} set_param;
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struct msg_start_conn {
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uint32_t sid;
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uint32_t cid;
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} start_conn;
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struct msg_stop_conn {
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uint32_t sid;
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uint32_t cid;
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uint64_t conn_handle;
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uint32_t flag;
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} stop_conn;
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struct msg_get_stats {
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uint32_t sid;
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uint32_t cid;
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} get_stats;
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} u;
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union {
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/* messages k -> u */
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int retcode;
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struct msg_create_session_ret {
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uint32_t sid;
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uint32_t host_no;
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} c_session_ret;
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struct msg_create_conn_ret {
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uint32_t sid;
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uint32_t cid;
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} c_conn_ret;
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struct msg_recv_req {
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uint32_t sid;
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uint32_t cid;
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uint64_t recv_handle;
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} recv_req;
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struct msg_conn_error {
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uint32_t sid;
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uint32_t cid;
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uint32_t error; /* enum iscsi_err */
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} connerror;
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} r;
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} __attribute__ ((aligned (sizeof(uint64_t))));
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/*
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* Common error codes
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*/
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enum iscsi_err {
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ISCSI_OK = 0,
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ISCSI_ERR_DATASN = ISCSI_ERR_BASE + 1,
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ISCSI_ERR_DATA_OFFSET = ISCSI_ERR_BASE + 2,
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ISCSI_ERR_MAX_CMDSN = ISCSI_ERR_BASE + 3,
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ISCSI_ERR_EXP_CMDSN = ISCSI_ERR_BASE + 4,
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ISCSI_ERR_BAD_OPCODE = ISCSI_ERR_BASE + 5,
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ISCSI_ERR_DATALEN = ISCSI_ERR_BASE + 6,
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ISCSI_ERR_AHSLEN = ISCSI_ERR_BASE + 7,
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ISCSI_ERR_PROTO = ISCSI_ERR_BASE + 8,
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ISCSI_ERR_LUN = ISCSI_ERR_BASE + 9,
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ISCSI_ERR_BAD_ITT = ISCSI_ERR_BASE + 10,
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ISCSI_ERR_CONN_FAILED = ISCSI_ERR_BASE + 11,
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ISCSI_ERR_R2TSN = ISCSI_ERR_BASE + 12,
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ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13,
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ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14,
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ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15,
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ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16,
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ISCSI_ERR_NO_SCSI_CMD = ISCSI_ERR_BASE + 17,
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};
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/*
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* iSCSI Parameters (RFC3720)
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*/
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enum iscsi_param {
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/* passed in using netlink set param */
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ISCSI_PARAM_MAX_RECV_DLENGTH,
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ISCSI_PARAM_MAX_XMIT_DLENGTH,
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ISCSI_PARAM_HDRDGST_EN,
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ISCSI_PARAM_DATADGST_EN,
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ISCSI_PARAM_INITIAL_R2T_EN,
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ISCSI_PARAM_MAX_R2T,
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ISCSI_PARAM_IMM_DATA_EN,
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ISCSI_PARAM_FIRST_BURST,
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ISCSI_PARAM_MAX_BURST,
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ISCSI_PARAM_PDU_INORDER_EN,
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ISCSI_PARAM_DATASEQ_INORDER_EN,
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ISCSI_PARAM_ERL,
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ISCSI_PARAM_IFMARKER_EN,
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ISCSI_PARAM_OFMARKER_EN,
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ISCSI_PARAM_TARGET_NAME,
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ISCSI_PARAM_TPGT,
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ISCSI_PARAM_PERSISTENT_ADDRESS,
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ISCSI_PARAM_PERSISTENT_PORT,
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ISCSI_PARAM_SESS_RECOVERY_TMO,
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/* pased in through bind conn using transport_fd */
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ISCSI_PARAM_CONN_PORT,
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ISCSI_PARAM_CONN_ADDRESS,
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/* must always be last */
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ISCSI_PARAM_MAX,
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};
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#define ISCSI_MAX_RECV_DLENGTH (1 << ISCSI_PARAM_MAX_RECV_DLENGTH)
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#define ISCSI_MAX_XMIT_DLENGTH (1 << ISCSI_PARAM_MAX_XMIT_DLENGTH)
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#define ISCSI_HDRDGST_EN (1 << ISCSI_PARAM_HDRDGST_EN)
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#define ISCSI_DATADGST_EN (1 << ISCSI_PARAM_DATADGST_EN)
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#define ISCSI_INITIAL_R2T_EN (1 << ISCSI_PARAM_INITIAL_R2T_EN)
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#define ISCSI_MAX_R2T (1 << ISCSI_PARAM_MAX_R2T)
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#define ISCSI_IMM_DATA_EN (1 << ISCSI_PARAM_IMM_DATA_EN)
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#define ISCSI_FIRST_BURST (1 << ISCSI_PARAM_FIRST_BURST)
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#define ISCSI_MAX_BURST (1 << ISCSI_PARAM_MAX_BURST)
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#define ISCSI_PDU_INORDER_EN (1 << ISCSI_PARAM_PDU_INORDER_EN)
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#define ISCSI_DATASEQ_INORDER_EN (1 << ISCSI_PARAM_DATASEQ_INORDER_EN)
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#define ISCSI_ERL (1 << ISCSI_PARAM_ERL)
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#define ISCSI_IFMARKER_EN (1 << ISCSI_PARAM_IFMARKER_EN)
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#define ISCSI_OFMARKER_EN (1 << ISCSI_PARAM_OFMARKER_EN)
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#define ISCSI_TARGET_NAME (1 << ISCSI_PARAM_TARGET_NAME)
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#define ISCSI_TPGT (1 << ISCSI_PARAM_TPGT)
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#define ISCSI_PERSISTENT_ADDRESS (1 << ISCSI_PARAM_PERSISTENT_ADDRESS)
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#define ISCSI_PERSISTENT_PORT (1 << ISCSI_PARAM_PERSISTENT_PORT)
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#define ISCSI_SESS_RECOVERY_TMO (1 << ISCSI_PARAM_SESS_RECOVERY_TMO)
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#define ISCSI_CONN_PORT (1 << ISCSI_PARAM_CONN_PORT)
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#define ISCSI_CONN_ADDRESS (1 << ISCSI_PARAM_CONN_ADDRESS)
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#define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
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#define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
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#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
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/**
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* iscsi_hostdata - get LLD hostdata from scsi_host
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* @_hostdata: pointer to scsi host's hostdata
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**/
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#define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
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/*
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* These flags presents iSCSI Data-Path capabilities.
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*/
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#define CAP_RECOVERY_L0 0x1
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#define CAP_RECOVERY_L1 0x2
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#define CAP_RECOVERY_L2 0x4
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#define CAP_MULTI_R2T 0x8
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#define CAP_HDRDGST 0x10
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#define CAP_DATADGST 0x20
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#define CAP_MULTI_CONN 0x40
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#define CAP_TEXT_NEGO 0x80
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#define CAP_MARKERS 0x100
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/*
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* These flags describes reason of stop_conn() call
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*/
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#define STOP_CONN_TERM 0x1
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#define STOP_CONN_SUSPEND 0x2
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#define STOP_CONN_RECOVER 0x3
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#define ISCSI_STATS_CUSTOM_MAX 32
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#define ISCSI_STATS_CUSTOM_DESC_MAX 64
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struct iscsi_stats_custom {
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char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
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uint64_t value;
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};
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/*
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* struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
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*
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* Note: this structure contains counters collected on per-connection basis.
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*/
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struct iscsi_stats {
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/* octets */
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uint64_t txdata_octets;
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uint64_t rxdata_octets;
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/* xmit pdus */
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uint32_t noptx_pdus;
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uint32_t scsicmd_pdus;
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uint32_t tmfcmd_pdus;
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uint32_t login_pdus;
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uint32_t text_pdus;
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uint32_t dataout_pdus;
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uint32_t logout_pdus;
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uint32_t snack_pdus;
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/* recv pdus */
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uint32_t noprx_pdus;
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uint32_t scsirsp_pdus;
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uint32_t tmfrsp_pdus;
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uint32_t textrsp_pdus;
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uint32_t datain_pdus;
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uint32_t logoutrsp_pdus;
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uint32_t r2t_pdus;
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uint32_t async_pdus;
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uint32_t rjt_pdus;
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/* errors */
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uint32_t digest_err;
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uint32_t timeout_err;
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/*
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* iSCSI Custom Statistics support, i.e. Transport could
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* extend existing MIB statistics with its own specific statistics
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* up to ISCSI_STATS_CUSTOM_MAX
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*/
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uint32_t custom_length;
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struct iscsi_stats_custom custom[0]
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__attribute__ ((aligned (sizeof(uint64_t))));
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};
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#endif
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