diff options
Diffstat (limited to 'drivers/scsi/iscsi_tcp.h')
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h new file mode 100644 index 000000000000..d23ae68fae0d --- /dev/null +++ b/drivers/scsi/iscsi_tcp.h @@ -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 */ |