[SCSI] open-iscsi/linux-iscsi-5 Initiator: Initiator header
drivers/scsi/iscsi_tcp.h, header file. Signed-off-by: Alex Aizman <itn780@yahoo.com> Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Alex Aizman
James Bottomley
Родитель
39e84790d3
Коммит
c213ca0792
|
|
@ -0,0 +1,322 @@
|
|||
/*
|
||||
* iSCSI Initiator TCP Transport
|
||||
* Copyright (C) 2004 Dmitry Yusupov
|
||||
* Copyright (C) 2004 Alex Aizman
|
||||
* Copyright (C) 2005 Mike Christie
|
||||
* 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_TCP_H
|
||||
#define ISCSI_TCP_H
|
||||
|
||||
/* Session's states */
|
||||
#define ISCSI_STATE_FREE 1
|
||||
#define ISCSI_STATE_LOGGED_IN 2
|
||||
#define ISCSI_STATE_FAILED 3
|
||||
#define ISCSI_STATE_TERMINATE 4
|
||||
|
||||
/* Connection's states */
|
||||
#define ISCSI_CONN_INITIAL_STAGE 0
|
||||
#define ISCSI_CONN_STARTED 1
|
||||
#define ISCSI_CONN_STOPPED 2
|
||||
#define ISCSI_CONN_CLEANUP_WAIT 3
|
||||
|
||||
/* Connection suspend "bit" */
|
||||
#define SUSPEND_BIT 1
|
||||
|
||||
/* Socket's Receive state machine */
|
||||
#define IN_PROGRESS_WAIT_HEADER 0x0
|
||||
#define IN_PROGRESS_HEADER_GATHER 0x1
|
||||
#define IN_PROGRESS_DATA_RECV 0x2
|
||||
#define IN_PROGRESS_DDIGEST_RECV 0x3
|
||||
|
||||
/* Task Mgmt states */
|
||||
#define TMABORT_INITIAL 0x0
|
||||
#define TMABORT_SUCCESS 0x1
|
||||
#define TMABORT_FAILED 0x2
|
||||
#define TMABORT_TIMEDOUT 0x3
|
||||
|
||||
/* xmit state machine */
|
||||
#define XMSTATE_IDLE 0x0
|
||||
#define XMSTATE_R_HDR 0x1
|
||||
#define XMSTATE_W_HDR 0x2
|
||||
#define XMSTATE_IMM_HDR 0x4
|
||||
#define XMSTATE_IMM_DATA 0x8
|
||||
#define XMSTATE_UNS_INIT 0x10
|
||||
#define XMSTATE_UNS_HDR 0x20
|
||||
#define XMSTATE_UNS_DATA 0x40
|
||||
#define XMSTATE_SOL_HDR 0x80
|
||||
#define XMSTATE_SOL_DATA 0x100
|
||||
#define XMSTATE_W_PAD 0x200
|
||||
#define XMSTATE_DATA_DIGEST 0x400
|
||||
|
||||
#define ISCSI_CONN_MAX 1
|
||||
#define ISCSI_CONN_RCVBUF_MIN 262144
|
||||
#define ISCSI_CONN_SNDBUF_MIN 262144
|
||||
#define ISCSI_PAD_LEN 4
|
||||
#define ISCSI_R2T_MAX 16
|
||||
#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */
|
||||
#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */
|
||||
#define ISCSI_MGMT_ITT_OFFSET 0xa00
|
||||
#define ISCSI_SG_TABLESIZE SG_ALL
|
||||
#define ISCSI_CMD_PER_LUN 128
|
||||
#define ISCSI_TCP_MAX_CMD_LEN 16
|
||||
|
||||
#define ITT_MASK (0xfff)
|
||||
#define CID_SHIFT 12
|
||||
#define CID_MASK (0xffff<<CID_SHIFT)
|
||||
#define AGE_SHIFT 28
|
||||
#define AGE_MASK (0xf<<AGE_SHIFT)
|
||||
|
||||
struct iscsi_queue {
|
||||
struct kfifo *queue; /* FIFO Queue */
|
||||
void **pool; /* Pool of elements */
|
||||
int max; /* Max number of elements */
|
||||
};
|
||||
|
||||
struct iscsi_session;
|
||||
struct iscsi_cmd_task;
|
||||
struct iscsi_mgmt_task;
|
||||
|
||||
/* Socket connection recieve helper */
|
||||
struct iscsi_tcp_recv {
|
||||
struct iscsi_hdr *hdr;
|
||||
struct sk_buff *skb;
|
||||
int offset;
|
||||
int len;
|
||||
int hdr_offset;
|
||||
int copy;
|
||||
int copied;
|
||||
int padding;
|
||||
struct iscsi_cmd_task *ctask; /* current cmd in progress */
|
||||
|
||||
/* copied and flipped values */
|
||||
int opcode;
|
||||
int flags;
|
||||
int cmd_status;
|
||||
int ahslen;
|
||||
int datalen;
|
||||
uint32_t itt;
|
||||
int datadgst;
|
||||
};
|
||||
|
||||
struct iscsi_conn {
|
||||
struct iscsi_hdr hdr; /* header placeholder */
|
||||
char hdrext[4*sizeof(__u16) +
|
||||
sizeof(__u32)];
|
||||
int data_copied;
|
||||
char *data; /* data placeholder */
|
||||
struct socket *sock; /* TCP socket */
|
||||
int data_size; /* actual recv_dlength */
|
||||
int stop_stage; /* conn_stop() flag: *
|
||||
* stop to recover, *
|
||||
* stop to terminate */
|
||||
/* iSCSI connection-wide sequencing */
|
||||
uint32_t exp_statsn;
|
||||
int hdr_size; /* PDU header size */
|
||||
unsigned long suspend_rx; /* suspend Rx */
|
||||
|
||||
struct crypto_tfm *rx_tfm; /* CRC32C (Rx) */
|
||||
struct crypto_tfm *data_rx_tfm; /* CRC32C (Rx) for data */
|
||||
|
||||
/* control data */
|
||||
int senselen; /* scsi sense length */
|
||||
int id; /* CID */
|
||||
struct iscsi_tcp_recv in; /* TCP receive context */
|
||||
struct iscsi_session *session; /* parent session */
|
||||
struct list_head item; /* maintains list of conns */
|
||||
int in_progress; /* connection state machine */
|
||||
int c_stage; /* connection state */
|
||||
struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
|
||||
struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
|
||||
struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
|
||||
spinlock_t lock; /* FIXME: to be removed */
|
||||
|
||||
/* old values for socket callbacks */
|
||||
void (*old_data_ready)(struct sock *, int);
|
||||
void (*old_state_change)(struct sock *);
|
||||
void (*old_write_space)(struct sock *);
|
||||
|
||||
/* xmit */
|
||||
struct crypto_tfm *tx_tfm; /* CRC32C (Tx) */
|
||||
struct crypto_tfm *data_tx_tfm; /* CRC32C (Tx) for data */
|
||||
struct kfifo *writequeue; /* write cmds for Data-Outs */
|
||||
struct kfifo *immqueue; /* immediate xmit queue */
|
||||
struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */
|
||||
struct kfifo *xmitqueue; /* data-path cmd queue */
|
||||
struct work_struct xmitwork; /* per-conn. xmit workqueue */
|
||||
struct semaphore xmitsema; /* serializes connection xmit,
|
||||
* access to kfifos: *
|
||||
* xmitqueue, writequeue, *
|
||||
* immqueue, mgmtqueue */
|
||||
unsigned long suspend_tx; /* suspend Tx */
|
||||
|
||||
/* abort */
|
||||
wait_queue_head_t ehwait; /* used in eh_abort() */
|
||||
struct iscsi_tm tmhdr;
|
||||
struct timer_list tmabort_timer; /* abort timer */
|
||||
int tmabort_state; /* see TMABORT_INITIAL, etc.*/
|
||||
|
||||
/* negotiated params */
|
||||
int max_recv_dlength;
|
||||
int max_xmit_dlength;
|
||||
int hdrdgst_en;
|
||||
int datadgst_en;
|
||||
|
||||
/* MIB-statistics */
|
||||
uint64_t txdata_octets;
|
||||
uint64_t rxdata_octets;
|
||||
uint32_t scsicmd_pdus_cnt;
|
||||
uint32_t dataout_pdus_cnt;
|
||||
uint32_t scsirsp_pdus_cnt;
|
||||
uint32_t datain_pdus_cnt;
|
||||
uint32_t r2t_pdus_cnt;
|
||||
uint32_t tmfcmd_pdus_cnt;
|
||||
int32_t tmfrsp_pdus_cnt;
|
||||
|
||||
/* custom statistics */
|
||||
uint32_t sendpage_failures_cnt;
|
||||
uint32_t discontiguous_hdr_cnt;
|
||||
uint32_t eh_abort_cnt;
|
||||
};
|
||||
|
||||
struct iscsi_session {
|
||||
/* iSCSI session-wide sequencing */
|
||||
uint32_t cmdsn;
|
||||
uint32_t exp_cmdsn;
|
||||
uint32_t max_cmdsn;
|
||||
|
||||
/* configuration */
|
||||
int initial_r2t_en;
|
||||
int max_r2t;
|
||||
int imm_data_en;
|
||||
int first_burst;
|
||||
int max_burst;
|
||||
int time2wait;
|
||||
int time2retain;
|
||||
int pdu_inorder_en;
|
||||
int dataseq_inorder_en;
|
||||
int erl;
|
||||
int ifmarker_en;
|
||||
int ofmarker_en;
|
||||
|
||||
/* control data */
|
||||
struct Scsi_Host *host;
|
||||
int id;
|
||||
struct iscsi_conn *leadconn; /* leading connection */
|
||||
spinlock_t lock; /* protects session state, *
|
||||
* sequence numbers, *
|
||||
* session resources: *
|
||||
* - cmdpool, *
|
||||
* - mgmtpool, *
|
||||
* - r2tpool */
|
||||
int state; /* session state */
|
||||
struct list_head item;
|
||||
void *auth_client;
|
||||
int conn_cnt;
|
||||
int age; /* counts session re-opens */
|
||||
|
||||
struct list_head connections; /* list of connections */
|
||||
int cmds_max; /* size of cmds array */
|
||||
struct iscsi_cmd_task **cmds; /* Original Cmds arr */
|
||||
struct iscsi_queue cmdpool; /* PDU's pool */
|
||||
int mgmtpool_max; /* size of mgmt array */
|
||||
struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
|
||||
struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */
|
||||
};
|
||||
|
||||
struct iscsi_buf {
|
||||
struct scatterlist sg;
|
||||
struct kvec iov;
|
||||
unsigned int sent;
|
||||
};
|
||||
|
||||
struct iscsi_data_task {
|
||||
struct iscsi_data hdr; /* PDU */
|
||||
char hdrext[sizeof(__u32)]; /* Header-Digest */
|
||||
struct list_head item; /* data queue item */
|
||||
struct iscsi_buf digestbuf; /* digest buffer */
|
||||
uint32_t digest; /* data digest */
|
||||
};
|
||||
#define ISCSI_DTASK_DEFAULT_MAX ISCSI_SG_TABLESIZE * PAGE_SIZE / 512
|
||||
|
||||
struct iscsi_mgmt_task {
|
||||
struct iscsi_hdr hdr; /* mgmt. PDU */
|
||||
char hdrext[sizeof(__u32)]; /* Header-Digest */
|
||||
char *data; /* mgmt payload */
|
||||
int xmstate; /* mgmt xmit progress */
|
||||
int data_count; /* counts data to be sent */
|
||||
struct iscsi_buf headbuf; /* header buffer */
|
||||
struct iscsi_buf sendbuf; /* in progress buffer */
|
||||
int sent;
|
||||
uint32_t itt; /* this ITT */
|
||||
};
|
||||
|
||||
struct iscsi_r2t_info {
|
||||
__be32 ttt; /* copied from R2T */
|
||||
__be32 exp_statsn; /* copied from R2T */
|
||||
uint32_t data_length; /* copied from R2T */
|
||||
uint32_t data_offset; /* copied from R2T */
|
||||
struct iscsi_buf headbuf; /* Data-Out Header Buffer */
|
||||
struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
|
||||
int sent; /* R2T sequence progress */
|
||||
int data_count; /* DATA-Out payload progress */
|
||||
struct scatterlist *sg; /* per-R2T SG list */
|
||||
int solicit_datasn;
|
||||
struct iscsi_data_task *dtask; /* which data task */
|
||||
};
|
||||
|
||||
struct iscsi_cmd_task {
|
||||
struct iscsi_cmd hdr; /* iSCSI PDU header */
|
||||
char hdrext[4*sizeof(__u16)+ /* AHS */
|
||||
sizeof(__u32)]; /* HeaderDigest */
|
||||
char pad[ISCSI_PAD_LEN];
|
||||
int itt; /* this ITT */
|
||||
int datasn; /* DataSN */
|
||||
struct iscsi_buf headbuf; /* header buf (xmit) */
|
||||
struct iscsi_buf sendbuf; /* in progress buffer*/
|
||||
int sent;
|
||||
struct scatterlist *sg; /* per-cmd SG list */
|
||||
struct scatterlist *bad_sg; /* assert statement */
|
||||
int sg_count; /* SG's to process */
|
||||
uint32_t unsol_datasn;
|
||||
uint32_t exp_r2tsn;
|
||||
int xmstate; /* xmit xtate machine */
|
||||
int imm_count; /* imm-data (bytes) */
|
||||
int unsol_count; /* unsolicited (bytes)*/
|
||||
int r2t_data_count; /* R2T Data-Out bytes */
|
||||
int data_count; /* remaining Data-Out */
|
||||
int pad_count; /* padded bytes */
|
||||
struct scsi_cmnd *sc; /* associated SCSI cmd*/
|
||||
int total_length;
|
||||
int data_offset;
|
||||
struct iscsi_conn *conn; /* used connection */
|
||||
struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */
|
||||
|
||||
struct iscsi_r2t_info *r2t; /* in progress R2T */
|
||||
struct iscsi_queue r2tpool;
|
||||
struct kfifo *r2tqueue;
|
||||
struct iscsi_r2t_info **r2ts;
|
||||
struct list_head dataqueue; /* Data-Out dataqueue */
|
||||
mempool_t *datapool;
|
||||
uint32_t datadigest; /* for recover digest */
|
||||
int digest_count;
|
||||
uint32_t immdigest; /* for imm data */
|
||||
struct iscsi_buf immbuf; /* for imm data digest */
|
||||
struct iscsi_data_task *dtask; /* data task in progress*/
|
||||
int digest_offset; /* for partial buff digest */
|
||||
};
|
||||
|
||||
#endif /* ISCSI_H */
|
||||
Загрузка…
Ссылка в новой задаче