diff options
Diffstat (limited to 'drivers/scsi/iscsi_tcp.h')
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 190 |
1 files changed, 20 insertions, 170 deletions
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index ba26741..8083028 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -2,7 +2,8 @@ * iSCSI Initiator TCP Transport * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify @@ -21,20 +22,7 @@ #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 +#include <scsi/libiscsi.h> /* Socket's Receive state machine */ #define IN_PROGRESS_WAIT_HEADER 0x0 @@ -42,12 +30,6 @@ #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 @@ -62,34 +44,14 @@ #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_DEF_CMD_PER_LUN 32 -#define ISCSI_MAX_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; +struct socket; /* Socket connection recieve helper */ struct iscsi_tcp_recv { @@ -104,48 +66,32 @@ struct iscsi_tcp_recv { 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; + char zero_copy_hdr; }; -struct iscsi_cls_conn; - -struct iscsi_conn { - struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ +struct iscsi_tcp_conn { + struct iscsi_conn *iscsi_conn; + struct socket *sock; 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 */ /* old values for socket callbacks */ void (*old_data_ready)(struct sock *, int); @@ -155,93 +101,14 @@ struct iscsi_conn { /* 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 mutex xmitmutex; /* 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 */ + /* MIB custom statistics */ uint32_t sendpage_failures_cnt; uint32_t discontiguous_hdr_cnt; - uint32_t eh_abort_cnt; ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); }; -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; unsigned int sent; @@ -251,22 +118,17 @@ struct iscsi_buf { 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 */ +struct iscsi_tcp_mgmt_task { + struct iscsi_hdr hdr; + char hdrext[sizeof(__u32)]; /* Header-Digest */ 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 { @@ -280,48 +142,36 @@ struct iscsi_r2t_info { 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_data_task dtask; /* which data task */ }; -struct iscsi_cmd_task { - struct iscsi_cmd hdr; /* iSCSI PDU header */ +struct iscsi_tcp_cmd_task { + struct iscsi_cmd hdr; char hdrext[4*sizeof(__u16)+ /* AHS */ sizeof(__u32)]; /* HeaderDigest */ char pad[ISCSI_PAD_LEN]; - int itt; /* this ITT */ - int datasn; /* DataSN */ + int pad_count; /* padded bytes */ struct iscsi_buf headbuf; /* header buf (xmit) */ struct iscsi_buf sendbuf; /* in progress buffer*/ + int xmstate; /* xmit xtate machine */ 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 */ + struct iscsi_data_task *dtask; /* data task in progress*/ + struct iscsi_data_task unsol_dtask; /* unsol data task */ + int digest_offset; /* for partial buff digest */ }; #endif /* ISCSI_H */ |
