diff options
Diffstat (limited to 'drivers/scsi/iscsi_tcp.h')
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 311 |
1 files changed, 27 insertions, 284 deletions
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index f95e61b76f7..f42ecb238af 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 @@ -18,308 +19,50 @@ * See the file COPYING included with this distribution for more details. */ -#ifndef ISCSI_TCP_H -#define ISCSI_TCP_H +#ifndef ISCSI_SW_TCP_H +#define ISCSI_SW_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 +#include <scsi/libiscsi.h> +#include <scsi/libiscsi_tcp.h> -/* 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 +struct socket; +struct iscsi_tcp_conn; -/* 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_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; - -/* Socket connection recieve helper */ -struct iscsi_tcp_recv { +/* Socket connection send helper */ +struct iscsi_sw_tcp_send { 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_segment segment; + struct iscsi_segment data_segment; }; -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 */ +struct iscsi_sw_tcp_conn { + struct socket *sock; + struct iscsi_sw_tcp_send out; /* old values for socket callbacks */ - void (*old_data_ready)(struct sock *, int); + void (*old_data_ready)(struct sock *); 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 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; + /* data and header digests */ + struct hash_desc tx_hash; /* CRC32C (Tx) */ + struct hash_desc rx_hash; /* CRC32C (Rx) */ - /* 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_sw_tcp_host { + struct iscsi_session *session; }; -struct iscsi_buf { - struct scatterlist sg; - unsigned int sent; - char use_sendmsg; -}; - -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 */ +struct iscsi_sw_tcp_hdrbuf { + struct iscsi_hdr hdrbuf; + char hdrextbuf[ISCSI_MAX_AHS_SIZE + + ISCSI_DIGEST_SIZE]; }; -#endif /* ISCSI_H */ +#endif /* ISCSI_SW_TCP_H */ |