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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [scsi/] [libiscsi.h] - Blame information for rev 62

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1 62 marcus.erl
/*
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 * iSCSI lib definitions
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 *
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 * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
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 * Copyright (C) 2004 - 2006 Mike Christie
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 * Copyright (C) 2004 - 2005 Dmitry Yusupov
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 * Copyright (C) 2004 - 2005 Alex Aizman
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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 by
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 * 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,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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 */
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#ifndef LIBISCSI_H
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#define LIBISCSI_H
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <scsi/iscsi_proto.h>
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#include <scsi/iscsi_if.h>
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struct scsi_transport_template;
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struct scsi_device;
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struct Scsi_Host;
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struct scsi_cmnd;
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struct socket;
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struct iscsi_transport;
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struct iscsi_cls_session;
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struct iscsi_cls_conn;
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struct iscsi_session;
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struct iscsi_nopin;
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/* #define DEBUG_SCSI */
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#ifdef DEBUG_SCSI
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#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
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#else
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#define debug_scsi(fmt...)
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#endif
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#define ISCSI_DEF_XMIT_CMDS_MAX 128     /* must be power of 2 */
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#define ISCSI_MGMT_CMDS_MAX     16      /* must be power of 2 */
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#define ISCSI_MGMT_ITT_OFFSET   0xa00
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#define ISCSI_DEF_CMD_PER_LUN           32
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#define ISCSI_MAX_CMD_PER_LUN           128
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/* Task Mgmt states */
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#define TMABORT_INITIAL                 0x0
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#define TMABORT_SUCCESS                 0x1
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#define TMABORT_FAILED                  0x2
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#define TMABORT_TIMEDOUT                0x3
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#define TMABORT_NOT_FOUND               0x4
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/* Connection suspend "bit" */
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#define ISCSI_SUSPEND_BIT               1
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#define ISCSI_ITT_MASK                  (0xfff)
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#define ISCSI_CID_SHIFT                 12
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#define ISCSI_CID_MASK                  (0xffff << ISCSI_CID_SHIFT)
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#define ISCSI_AGE_SHIFT                 28
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#define ISCSI_AGE_MASK                  (0xf << ISCSI_AGE_SHIFT)
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#define ISCSI_ADDRESS_BUF_LEN           64
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struct iscsi_mgmt_task {
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        /*
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         * Becuae LLDs allocate their hdr differently, this is a pointer to
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         * that storage. It must be setup at session creation time.
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         */
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        struct iscsi_hdr        *hdr;
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        char                    *data;          /* mgmt payload */
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        unsigned                data_count;     /* counts data to be sent */
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        uint32_t                itt;            /* this ITT */
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        void                    *dd_data;       /* driver/transport data */
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        struct list_head        running;
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};
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enum {
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        ISCSI_TASK_COMPLETED,
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        ISCSI_TASK_PENDING,
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        ISCSI_TASK_RUNNING,
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        ISCSI_TASK_ABORTING,
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};
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struct iscsi_cmd_task {
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        /*
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         * Becuae LLDs allocate their hdr differently, this is a pointer to
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         * that storage. It must be setup at session creation time.
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         */
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        struct iscsi_cmd        *hdr;
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        int                     itt;            /* this ITT */
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        uint32_t                unsol_datasn;
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        unsigned                imm_count;      /* imm-data (bytes)   */
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        unsigned                unsol_count;    /* unsolicited (bytes)*/
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        /* offset in unsolicited stream (bytes); */
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        unsigned                unsol_offset;
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        unsigned                data_count;     /* remaining Data-Out */
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        struct scsi_cmnd        *sc;            /* associated SCSI cmd*/
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        struct iscsi_conn       *conn;          /* used connection    */
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        struct iscsi_mgmt_task  *mtask;         /* tmf mtask in progr */
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        /* state set/tested under session->lock */
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        int                     state;
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        atomic_t                refcount;
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        struct list_head        running;        /* running cmd list */
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        void                    *dd_data;       /* driver/transport data */
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};
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struct iscsi_conn {
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        struct iscsi_cls_conn   *cls_conn;      /* ptr to class connection */
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        void                    *dd_data;       /* iscsi_transport data */
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        struct iscsi_session    *session;       /* parent session */
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        /*
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         * LLDs should set this lock. It protects the transport recv
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         * code
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         */
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        rwlock_t                *recv_lock;
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        /*
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         * conn_stop() flag: stop to recover, stop to terminate
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         */
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        int                     stop_stage;
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        /* iSCSI connection-wide sequencing */
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        uint32_t                exp_statsn;
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        /* control data */
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        int                     id;             /* CID */
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        int                     c_stage;        /* connection state */
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        /*
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         * Preallocated buffer for pdus that have data but do not
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         * originate from scsi-ml. We never have two pdus using the
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         * buffer at the same time. It is only allocated to
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         * the default max recv size because the pdus we support
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         * should always fit in this buffer
148
         */
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        char                    *data;
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        struct iscsi_mgmt_task  *login_mtask;   /* mtask used for login/text */
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        struct iscsi_mgmt_task  *mtask;         /* xmit mtask in progress */
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        struct iscsi_cmd_task   *ctask;         /* xmit ctask in progress */
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        /* xmit */
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        struct kfifo            *mgmtqueue;     /* mgmt (control) xmit queue */
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        struct list_head        mgmt_run_list;  /* list of control tasks */
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        struct list_head        xmitqueue;      /* data-path cmd queue */
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        struct list_head        run_list;       /* list of cmds in progress */
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        struct work_struct      xmitwork;       /* per-conn. xmit workqueue */
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        unsigned long           suspend_tx;     /* suspend Tx */
161
        unsigned long           suspend_rx;     /* suspend Rx */
162
 
163
        /* abort */
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        wait_queue_head_t       ehwait;         /* used in eh_abort() */
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        struct iscsi_tm         tmhdr;
166
        struct timer_list       tmabort_timer;
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        int                     tmabort_state;  /* see TMABORT_INITIAL, etc.*/
168
 
169
        /* negotiated params */
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        unsigned                max_recv_dlength; /* initiator_max_recv_dsl*/
171
        unsigned                max_xmit_dlength; /* target_max_recv_dsl */
172
        int                     hdrdgst_en;
173
        int                     datadgst_en;
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        int                     ifmarker_en;
175
        int                     ofmarker_en;
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        /* values userspace uses to id a conn */
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        int                     persistent_port;
178
        char                    *persistent_address;
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        /* remote portal currently connected to */
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        int                     portal_port;
181
        char                    portal_address[ISCSI_ADDRESS_BUF_LEN];
182
        /* local address */
183
        int                     local_port;
184
        char                    local_address[ISCSI_ADDRESS_BUF_LEN];
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        /* MIB-statistics */
187
        uint64_t                txdata_octets;
188
        uint64_t                rxdata_octets;
189
        uint32_t                scsicmd_pdus_cnt;
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        uint32_t                dataout_pdus_cnt;
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        uint32_t                scsirsp_pdus_cnt;
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        uint32_t                datain_pdus_cnt;
193
        uint32_t                r2t_pdus_cnt;
194
        uint32_t                tmfcmd_pdus_cnt;
195
        int32_t                 tmfrsp_pdus_cnt;
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197
        /* custom statistics */
198
        uint32_t                eh_abort_cnt;
199
};
200
 
201
struct iscsi_queue {
202
        struct kfifo            *queue;         /* FIFO Queue */
203
        void                    **pool;         /* Pool of elements */
204
        int                     max;            /* Max number of elements */
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};
206
 
207
struct iscsi_session {
208
        /*
209
         * Syncs up the scsi eh thread with the iscsi eh thread when sending
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         * task management functions. This must be taken before the session
211
         * and recv lock.
212
         */
213
        struct mutex            eh_mutex;
214
 
215
        /* iSCSI session-wide sequencing */
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        uint32_t                cmdsn;
217
        uint32_t                exp_cmdsn;
218
        uint32_t                max_cmdsn;
219
 
220
        /* This tracks the reqs queued into the initiator */
221
        uint32_t                queued_cmdsn;
222
 
223
        /* configuration */
224
        int                     initial_r2t_en;
225
        unsigned                max_r2t;
226
        int                     imm_data_en;
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        unsigned                first_burst;
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        unsigned                max_burst;
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        int                     time2wait;
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        int                     time2retain;
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        int                     pdu_inorder_en;
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        int                     dataseq_inorder_en;
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        int                     erl;
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        int                     tpgt;
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        char                    *username;
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        char                    *username_in;
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        char                    *password;
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        char                    *password_in;
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        char                    *targetname;
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        char                    *initiatorname;
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        /* hw address or netdev iscsi connection is bound to */
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        char                    *hwaddress;
243
        char                    *netdev;
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        /* control data */
245
        struct iscsi_transport  *tt;
246
        struct Scsi_Host        *host;
247
        struct iscsi_conn       *leadconn;      /* leading connection */
248
        spinlock_t              lock;           /* protects session state, *
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                                                 * sequence numbers,       *
250
                                                 * session resources:      *
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                                                 * - cmdpool,              *
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                                                 * - mgmtpool,             *
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                                                 * - r2tpool               */
254
        int                     state;          /* session state           */
255
        int                     age;            /* counts session re-opens */
256
 
257
        int                     cmds_max;       /* size of cmds array */
258
        struct iscsi_cmd_task   **cmds;         /* Original Cmds arr */
259
        struct iscsi_queue      cmdpool;        /* PDU's pool */
260
        int                     mgmtpool_max;   /* size of mgmt array */
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        struct iscsi_mgmt_task  **mgmt_cmds;    /* Original mgmt arr */
262
        struct iscsi_queue      mgmtpool;       /* Mgmt PDU's pool */
263
};
264
 
265
/*
266
 * scsi host template
267
 */
268
extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
269
extern int iscsi_eh_abort(struct scsi_cmnd *sc);
270
extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
271
extern int iscsi_queuecommand(struct scsi_cmnd *sc,
272
                              void (*done)(struct scsi_cmnd *));
273
 
274
 
275
/*
276
 * iSCSI host helpers.
277
 */
278
extern int iscsi_host_set_param(struct Scsi_Host *shost,
279
                                enum iscsi_host_param param, char *buf,
280
                                int buflen);
281
extern int iscsi_host_get_param(struct Scsi_Host *shost,
282
                                enum iscsi_host_param param, char *buf);
283
 
284
/*
285
 * session management
286
 */
287
extern struct iscsi_cls_session *
288
iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
289
                    uint16_t, uint16_t, int, int, uint32_t, uint32_t *);
290
extern void iscsi_session_teardown(struct iscsi_cls_session *);
291
extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *);
292
extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
293
extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
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                           enum iscsi_param param, char *buf, int buflen);
295
extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
296
                                   enum iscsi_param param, char *buf);
297
 
298
#define session_to_cls(_sess) \
299
        hostdata_session(_sess->host->hostdata)
300
 
301
/*
302
 * connection management
303
 */
304
extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
305
                                               uint32_t);
306
extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
307
extern int iscsi_conn_start(struct iscsi_cls_conn *);
308
extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
309
extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
310
                           int);
311
extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
312
extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
313
                                enum iscsi_param param, char *buf);
314
 
315
/*
316
 * pdu and task processing
317
 */
318
extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
319
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *,
320
                                        struct iscsi_data *hdr);
321
extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
322
                                char *, uint32_t);
323
extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
324
                              char *, int);
325
extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
326
                                char *, int);
327
extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *,
328
                            uint32_t *);
329
 
330
/*
331
 * generic helpers
332
 */
333
extern void iscsi_pool_free(struct iscsi_queue *, void **);
334
extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);
335
 
336
#endif

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