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linux/include/scsi/iscsi_if.h
Mike Christie 3fe5ae8b4c [SCSI] libiscsi: add warm target reset tmf support 
This implements warm target reset tmf support for
the scsi-ml target reset callback. Previously we would
just drop the session in that callback. This patch will
now try a target reset and if that fails drop the session.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04 12:01:36 -06:00

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/*
* iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
*
* Copyright (C) 2005 Dmitry Yusupov
* Copyright (C) 2005 Alex Aizman
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* See the file COPYING included with this distribution for more details.
*/
#ifndef ISCSI_IF_H
#define ISCSI_IF_H
#include <scsi/iscsi_proto.h>
#include <linux/in.h>
#include <linux/in6.h>
#define ISCSI_NL_GRP_ISCSID 1
#define ISCSI_NL_GRP_UIP 2
#define UEVENT_BASE 10
#define KEVENT_BASE 100
#define ISCSI_ERR_BASE 1000
enum iscsi_uevent_e {
ISCSI_UEVENT_UNKNOWN = 0,
/* down events */
ISCSI_UEVENT_CREATE_SESSION = UEVENT_BASE + 1,
ISCSI_UEVENT_DESTROY_SESSION = UEVENT_BASE + 2,
ISCSI_UEVENT_CREATE_CONN = UEVENT_BASE + 3,
ISCSI_UEVENT_DESTROY_CONN = UEVENT_BASE + 4,
ISCSI_UEVENT_BIND_CONN = UEVENT_BASE + 5,
ISCSI_UEVENT_SET_PARAM = UEVENT_BASE + 6,
ISCSI_UEVENT_START_CONN = UEVENT_BASE + 7,
ISCSI_UEVENT_STOP_CONN = UEVENT_BASE + 8,
ISCSI_UEVENT_SEND_PDU = UEVENT_BASE + 9,
ISCSI_UEVENT_GET_STATS = UEVENT_BASE + 10,
ISCSI_UEVENT_GET_PARAM = UEVENT_BASE + 11,
ISCSI_UEVENT_TRANSPORT_EP_CONNECT = UEVENT_BASE + 12,
ISCSI_UEVENT_TRANSPORT_EP_POLL = UEVENT_BASE + 13,
ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT = UEVENT_BASE + 14,
ISCSI_UEVENT_TGT_DSCVR = UEVENT_BASE + 15,
ISCSI_UEVENT_SET_HOST_PARAM = UEVENT_BASE + 16,
ISCSI_UEVENT_UNBIND_SESSION = UEVENT_BASE + 17,
ISCSI_UEVENT_CREATE_BOUND_SESSION = UEVENT_BASE + 18,
ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST = UEVENT_BASE + 19,
ISCSI_UEVENT_PATH_UPDATE = UEVENT_BASE + 20,
/* up events */
ISCSI_KEVENT_RECV_PDU = KEVENT_BASE + 1,
ISCSI_KEVENT_CONN_ERROR = KEVENT_BASE + 2,
ISCSI_KEVENT_IF_ERROR = KEVENT_BASE + 3,
ISCSI_KEVENT_DESTROY_SESSION = KEVENT_BASE + 4,
ISCSI_KEVENT_UNBIND_SESSION = KEVENT_BASE + 5,
ISCSI_KEVENT_CREATE_SESSION = KEVENT_BASE + 6,
ISCSI_KEVENT_PATH_REQ = KEVENT_BASE + 7,
ISCSI_KEVENT_IF_DOWN = KEVENT_BASE + 8,
};
enum iscsi_tgt_dscvr {
ISCSI_TGT_DSCVR_SEND_TARGETS = 1,
ISCSI_TGT_DSCVR_ISNS = 2,
ISCSI_TGT_DSCVR_SLP = 3,
};
struct iscsi_uevent {
uint32_t type; /* k/u events type */
uint32_t iferror; /* carries interface or resource errors */
uint64_t transport_handle;
union {
/* messages u -> k */
struct msg_create_session {
uint32_t initial_cmdsn;
uint16_t cmds_max;
uint16_t queue_depth;
} c_session;
struct msg_create_bound_session {
uint64_t ep_handle;
uint32_t initial_cmdsn;
uint16_t cmds_max;
uint16_t queue_depth;
} c_bound_session;
struct msg_destroy_session {
uint32_t sid;
} d_session;
struct msg_create_conn {
uint32_t sid;
uint32_t cid;
} c_conn;
struct msg_bind_conn {
uint32_t sid;
uint32_t cid;
uint64_t transport_eph;
uint32_t is_leading;
} b_conn;
struct msg_destroy_conn {
uint32_t sid;
uint32_t cid;
} d_conn;
struct msg_send_pdu {
uint32_t sid;
uint32_t cid;
uint32_t hdr_size;
uint32_t data_size;
} send_pdu;
struct msg_set_param {
uint32_t sid;
uint32_t cid;
uint32_t param; /* enum iscsi_param */
uint32_t len;
} set_param;
struct msg_start_conn {
uint32_t sid;
uint32_t cid;
} start_conn;
struct msg_stop_conn {
uint32_t sid;
uint32_t cid;
uint64_t conn_handle;
uint32_t flag;
} stop_conn;
struct msg_get_stats {
uint32_t sid;
uint32_t cid;
} get_stats;
struct msg_transport_connect {
uint32_t non_blocking;
} ep_connect;
struct msg_transport_connect_through_host {
uint32_t host_no;
uint32_t non_blocking;
} ep_connect_through_host;
struct msg_transport_poll {
uint64_t ep_handle;
uint32_t timeout_ms;
} ep_poll;
struct msg_transport_disconnect {
uint64_t ep_handle;
} ep_disconnect;
struct msg_tgt_dscvr {
enum iscsi_tgt_dscvr type;
uint32_t host_no;
/*
* enable = 1 to establish a new connection
* with the server. enable = 0 to disconnect
* from the server. Used primarily to switch
* from one iSNS server to another.
*/
uint32_t enable;
} tgt_dscvr;
struct msg_set_host_param {
uint32_t host_no;
uint32_t param; /* enum iscsi_host_param */
uint32_t len;
} set_host_param;
struct msg_set_path {
uint32_t host_no;
} set_path;
} u;
union {
/* messages k -> u */
int retcode;
struct msg_create_session_ret {
uint32_t sid;
uint32_t host_no;
} c_session_ret;
struct msg_create_conn_ret {
uint32_t sid;
uint32_t cid;
} c_conn_ret;
struct msg_unbind_session {
uint32_t sid;
uint32_t host_no;
} unbind_session;
struct msg_recv_req {
uint32_t sid;
uint32_t cid;
uint64_t recv_handle;
} recv_req;
struct msg_conn_error {
uint32_t sid;
uint32_t cid;
uint32_t error; /* enum iscsi_err */
} connerror;
struct msg_session_destroyed {
uint32_t host_no;
uint32_t sid;
} d_session;
struct msg_transport_connect_ret {
uint64_t handle;
} ep_connect_ret;
struct msg_req_path {
uint32_t host_no;
} req_path;
struct msg_notify_if_down {
uint32_t host_no;
} notify_if_down;
} r;
} __attribute__ ((aligned (sizeof(uint64_t))));
/*
* To keep the struct iscsi_uevent size the same for userspace code
* compatibility, the main structure for ISCSI_UEVENT_PATH_UPDATE and
* ISCSI_KEVENT_PATH_REQ is defined separately and comes after the
* struct iscsi_uevent in the NETLINK_ISCSI message.
*/
struct iscsi_path {
uint64_t handle;
uint8_t mac_addr[6];
uint8_t mac_addr_old[6];
uint32_t ip_addr_len; /* 4 or 16 */
union {
struct in_addr v4_addr;
struct in6_addr v6_addr;
} src;
union {
struct in_addr v4_addr;
struct in6_addr v6_addr;
} dst;
uint16_t vlan_id;
uint16_t pmtu;
} __attribute__ ((aligned (sizeof(uint64_t))));
/*
* Common error codes
*/
enum iscsi_err {
ISCSI_OK = 0,
ISCSI_ERR_DATASN = ISCSI_ERR_BASE + 1,
ISCSI_ERR_DATA_OFFSET = ISCSI_ERR_BASE + 2,
ISCSI_ERR_MAX_CMDSN = ISCSI_ERR_BASE + 3,
ISCSI_ERR_EXP_CMDSN = ISCSI_ERR_BASE + 4,
ISCSI_ERR_BAD_OPCODE = ISCSI_ERR_BASE + 5,
ISCSI_ERR_DATALEN = ISCSI_ERR_BASE + 6,
ISCSI_ERR_AHSLEN = ISCSI_ERR_BASE + 7,
ISCSI_ERR_PROTO = ISCSI_ERR_BASE + 8,
ISCSI_ERR_LUN = ISCSI_ERR_BASE + 9,
ISCSI_ERR_BAD_ITT = ISCSI_ERR_BASE + 10,
ISCSI_ERR_CONN_FAILED = ISCSI_ERR_BASE + 11,
ISCSI_ERR_R2TSN = ISCSI_ERR_BASE + 12,
ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13,
ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14,
ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15,
ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16,
ISCSI_ERR_NO_SCSI_CMD = ISCSI_ERR_BASE + 17,
ISCSI_ERR_INVALID_HOST = ISCSI_ERR_BASE + 18,
ISCSI_ERR_XMIT_FAILED = ISCSI_ERR_BASE + 19,
ISCSI_ERR_TCP_CONN_CLOSE = ISCSI_ERR_BASE + 20,
};
/*
* iSCSI Parameters (RFC3720)
*/
enum iscsi_param {
/* passed in using netlink set param */
ISCSI_PARAM_MAX_RECV_DLENGTH,
ISCSI_PARAM_MAX_XMIT_DLENGTH,
ISCSI_PARAM_HDRDGST_EN,
ISCSI_PARAM_DATADGST_EN,
ISCSI_PARAM_INITIAL_R2T_EN,
ISCSI_PARAM_MAX_R2T,
ISCSI_PARAM_IMM_DATA_EN,
ISCSI_PARAM_FIRST_BURST,
ISCSI_PARAM_MAX_BURST,
ISCSI_PARAM_PDU_INORDER_EN,
ISCSI_PARAM_DATASEQ_INORDER_EN,
ISCSI_PARAM_ERL,
ISCSI_PARAM_IFMARKER_EN,
ISCSI_PARAM_OFMARKER_EN,
ISCSI_PARAM_EXP_STATSN,
ISCSI_PARAM_TARGET_NAME,
ISCSI_PARAM_TPGT,
ISCSI_PARAM_PERSISTENT_ADDRESS,
ISCSI_PARAM_PERSISTENT_PORT,
ISCSI_PARAM_SESS_RECOVERY_TMO,
/* pased in through bind conn using transport_fd */
ISCSI_PARAM_CONN_PORT,
ISCSI_PARAM_CONN_ADDRESS,
ISCSI_PARAM_USERNAME,
ISCSI_PARAM_USERNAME_IN,
ISCSI_PARAM_PASSWORD,
ISCSI_PARAM_PASSWORD_IN,
ISCSI_PARAM_FAST_ABORT,
ISCSI_PARAM_ABORT_TMO,
ISCSI_PARAM_LU_RESET_TMO,
ISCSI_PARAM_HOST_RESET_TMO,
ISCSI_PARAM_PING_TMO,
ISCSI_PARAM_RECV_TMO,
ISCSI_PARAM_IFACE_NAME,
ISCSI_PARAM_ISID,
ISCSI_PARAM_INITIATOR_NAME,
ISCSI_PARAM_TGT_RESET_TMO,
/* must always be last */
ISCSI_PARAM_MAX,
};
#define ISCSI_MAX_RECV_DLENGTH (1ULL << ISCSI_PARAM_MAX_RECV_DLENGTH)
#define ISCSI_MAX_XMIT_DLENGTH (1ULL << ISCSI_PARAM_MAX_XMIT_DLENGTH)
#define ISCSI_HDRDGST_EN (1ULL << ISCSI_PARAM_HDRDGST_EN)
#define ISCSI_DATADGST_EN (1ULL << ISCSI_PARAM_DATADGST_EN)
#define ISCSI_INITIAL_R2T_EN (1ULL << ISCSI_PARAM_INITIAL_R2T_EN)
#define ISCSI_MAX_R2T (1ULL << ISCSI_PARAM_MAX_R2T)
#define ISCSI_IMM_DATA_EN (1ULL << ISCSI_PARAM_IMM_DATA_EN)
#define ISCSI_FIRST_BURST (1ULL << ISCSI_PARAM_FIRST_BURST)
#define ISCSI_MAX_BURST (1ULL << ISCSI_PARAM_MAX_BURST)
#define ISCSI_PDU_INORDER_EN (1ULL << ISCSI_PARAM_PDU_INORDER_EN)
#define ISCSI_DATASEQ_INORDER_EN (1ULL << ISCSI_PARAM_DATASEQ_INORDER_EN)
#define ISCSI_ERL (1ULL << ISCSI_PARAM_ERL)
#define ISCSI_IFMARKER_EN (1ULL << ISCSI_PARAM_IFMARKER_EN)
#define ISCSI_OFMARKER_EN (1ULL << ISCSI_PARAM_OFMARKER_EN)
#define ISCSI_EXP_STATSN (1ULL << ISCSI_PARAM_EXP_STATSN)
#define ISCSI_TARGET_NAME (1ULL << ISCSI_PARAM_TARGET_NAME)
#define ISCSI_TPGT (1ULL << ISCSI_PARAM_TPGT)
#define ISCSI_PERSISTENT_ADDRESS (1ULL << ISCSI_PARAM_PERSISTENT_ADDRESS)
#define ISCSI_PERSISTENT_PORT (1ULL << ISCSI_PARAM_PERSISTENT_PORT)
#define ISCSI_SESS_RECOVERY_TMO (1ULL << ISCSI_PARAM_SESS_RECOVERY_TMO)
#define ISCSI_CONN_PORT (1ULL << ISCSI_PARAM_CONN_PORT)
#define ISCSI_CONN_ADDRESS (1ULL << ISCSI_PARAM_CONN_ADDRESS)
#define ISCSI_USERNAME (1ULL << ISCSI_PARAM_USERNAME)
#define ISCSI_USERNAME_IN (1ULL << ISCSI_PARAM_USERNAME_IN)
#define ISCSI_PASSWORD (1ULL << ISCSI_PARAM_PASSWORD)
#define ISCSI_PASSWORD_IN (1ULL << ISCSI_PARAM_PASSWORD_IN)
#define ISCSI_FAST_ABORT (1ULL << ISCSI_PARAM_FAST_ABORT)
#define ISCSI_ABORT_TMO (1ULL << ISCSI_PARAM_ABORT_TMO)
#define ISCSI_LU_RESET_TMO (1ULL << ISCSI_PARAM_LU_RESET_TMO)
#define ISCSI_HOST_RESET_TMO (1ULL << ISCSI_PARAM_HOST_RESET_TMO)
#define ISCSI_PING_TMO (1ULL << ISCSI_PARAM_PING_TMO)
#define ISCSI_RECV_TMO (1ULL << ISCSI_PARAM_RECV_TMO)
#define ISCSI_IFACE_NAME (1ULL << ISCSI_PARAM_IFACE_NAME)
#define ISCSI_ISID (1ULL << ISCSI_PARAM_ISID)
#define ISCSI_INITIATOR_NAME (1ULL << ISCSI_PARAM_INITIATOR_NAME)
#define ISCSI_TGT_RESET_TMO (1ULL << ISCSI_PARAM_TGT_RESET_TMO)
/* iSCSI HBA params */
enum iscsi_host_param {
ISCSI_HOST_PARAM_HWADDRESS,
ISCSI_HOST_PARAM_INITIATOR_NAME,
ISCSI_HOST_PARAM_NETDEV_NAME,
ISCSI_HOST_PARAM_IPADDRESS,
ISCSI_HOST_PARAM_MAX,
};
#define ISCSI_HOST_HWADDRESS (1ULL << ISCSI_HOST_PARAM_HWADDRESS)
#define ISCSI_HOST_INITIATOR_NAME (1ULL << ISCSI_HOST_PARAM_INITIATOR_NAME)
#define ISCSI_HOST_NETDEV_NAME (1ULL << ISCSI_HOST_PARAM_NETDEV_NAME)
#define ISCSI_HOST_IPADDRESS (1ULL << ISCSI_HOST_PARAM_IPADDRESS)
#define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
#define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
/*
* These flags presents iSCSI Data-Path capabilities.
*/
#define CAP_RECOVERY_L0 0x1
#define CAP_RECOVERY_L1 0x2
#define CAP_RECOVERY_L2 0x4
#define CAP_MULTI_R2T 0x8
#define CAP_HDRDGST 0x10
#define CAP_DATADGST 0x20
#define CAP_MULTI_CONN 0x40
#define CAP_TEXT_NEGO 0x80
#define CAP_MARKERS 0x100
#define CAP_FW_DB 0x200
#define CAP_SENDTARGETS_OFFLOAD 0x400 /* offload discovery process */
#define CAP_DATA_PATH_OFFLOAD 0x800 /* offload entire IO path */
#define CAP_DIGEST_OFFLOAD 0x1000 /* offload hdr and data digests */
#define CAP_PADDING_OFFLOAD 0x2000 /* offload padding insertion, removal,
and verification */
/*
* These flags describes reason of stop_conn() call
*/
#define STOP_CONN_TERM 0x1
#define STOP_CONN_SUSPEND 0x2
#define STOP_CONN_RECOVER 0x3
#define ISCSI_STATS_CUSTOM_MAX 32
#define ISCSI_STATS_CUSTOM_DESC_MAX 64
struct iscsi_stats_custom {
char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
uint64_t value;
};
/*
* struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
*
* Note: this structure contains counters collected on per-connection basis.
*/
struct iscsi_stats {
/* octets */
uint64_t txdata_octets;
uint64_t rxdata_octets;
/* xmit pdus */
uint32_t noptx_pdus;
uint32_t scsicmd_pdus;
uint32_t tmfcmd_pdus;
uint32_t login_pdus;
uint32_t text_pdus;
uint32_t dataout_pdus;
uint32_t logout_pdus;
uint32_t snack_pdus;
/* recv pdus */
uint32_t noprx_pdus;
uint32_t scsirsp_pdus;
uint32_t tmfrsp_pdus;
uint32_t textrsp_pdus;
uint32_t datain_pdus;
uint32_t logoutrsp_pdus;
uint32_t r2t_pdus;
uint32_t async_pdus;
uint32_t rjt_pdus;
/* errors */
uint32_t digest_err;
uint32_t timeout_err;
/*
* iSCSI Custom Statistics support, i.e. Transport could
* extend existing MIB statistics with its own specific statistics
* up to ISCSI_STATS_CUSTOM_MAX
*/
uint32_t custom_length;
struct iscsi_stats_custom custom[0]
__attribute__ ((aligned (sizeof(uint64_t))));
};
#endif
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