From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Aizman Subject: Re: [ANNOUNCE] Linux-iSCSI High-Performance Initiator: iscsi_tcp.h Date: Mon, 18 Apr 2005 22:55:28 -0700 Message-ID: <42649D50.3020103@yahoo.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------010907000305040105070201" Return-path: To: netdev@oss.sgi.com Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org This is a multi-part message in MIME format. --------------010907000305040105070201 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Attached: iscsi_tcp.h. The corresponding source file (iscsi_tcp.c) was sent in the previous e-mail. Again, it'd be great to get this code reviewed. Thanks! --------------010907000305040105070201 Content-Type: text/plain; name="iscsi_tcp.h" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="iscsi_tcp.h" /* * iSCSI Initiator TCP Transport * Copyright (C) 2004 Dmitry Yusupov, Alex Aizman * 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 #include /* 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_CNX_INITIAL_STAGE 0 #define ISCSI_CNX_STARTED 1 #define ISCSI_CNX_STOPPED 2 #define ISCSI_CNX_CLEANUP_WAIT 3 /* Socket's Receive state machine */ #define IN_PROGRESS_WAIT_HEADER 0x0 #define IN_PROGRESS_HEADER_GATHER 0x1 #define IN_PROGRESS_DATA_RECV 0x2 /* Task Mgmt states */ #define TMABORT_INITIAL 0x0 #define TMABORT_SUCCESS 0x1 #define TMABORT_FAILED 0x2 #define TMABORT_TIMEDOUT 0x3 /* iSCSI Task Command's state machine */ #define IN_PROGRESS_IDLE 0x0 #define IN_PROGRESS_READ 0x1 #define IN_PROGRESS_WRITE 0x2 /* 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 ISCSI_DEFAULT_PORT 3260 #define ISCSI_STRING_MAX 255 #define ISCSI_NODE_NAME_MAX 255 #define ISCSI_NODE_PORTAL_MAX 32 #define ISCSI_ALIAS_NAME_MAX 255 #define ISCSI_CONN_MAX 1 #define ISCSI_PORTAL_MAX 1 #define ISCSI_CONN_RCVBUF_MIN 262144 #define ISCSI_CONN_SNDBUF_MIN 262144 #define ISCSI_TEXT_SEPARATOR '=' #define ISCSI_PAD_LEN 4 #define ISCSI_DRAFT20_VERSION 0x00 #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 0x1000 #define ISCSI_SG_TABLESIZE SG_ALL #define ISCSI_CMD_PER_LUN 128 #define ISCSI_TCP_MAX_LUN 256 #define ISCSI_TCP_MAX_CMD_LEN 16 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; }; struct iscsi_conn { struct iscsi_hdr hdr; /* Header placeholder */ char hdrext[4*sizeof(__u16) + sizeof(__u32)]; char *data; /* Data placeholder */ int data_copied; /* iSCSI connection-wide sequencing */ uint32_t exp_statsn; int hdr_size; /* PDU Header size pre-calc. */ /* control data */ int senselen; /* is data has sense? */ int cpu; /* binded CPU */ int busy; int id; /* iSCSI CID */ struct iscsi_tcp_recv in; /* TCP receive context */ int in_progress; /* Connection state machine */ struct socket *sock; /* BSD socket layer */ struct iscsi_session *session; /* Parent session */ struct list_head item; /* item's list of connections */ struct kfifo *writequeue; /* Write response xmit queue */ struct kfifo *immqueue; /* Immediate xmit queue */ struct kfifo *mgmtqueue; /* Mgmt xmit queue */ struct kfifo *xmitqueue; /* Data-path queue */ struct work_struct xmitwork; /* per-conn. xmit workqueue */ volatile int c_stage; /* Connection state */ iscsi_cnx_t handle; /* CP connection handle */ struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ spinlock_t lock; /* general connection lock */ volatile int suspend; /* connection suspended */ struct crypto_tfm *tx_tfm; struct crypto_tfm *rx_tfm; struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ struct semaphore xmitsema; wait_queue_head_t ehwait; struct iscsi_tm tmhdr; volatile int tmabort_state; struct timer_list tmabort_timer; volatile int stop_stage; /* cnx_stop() state machine */ int data_size; /* actual recv_dlength size */ /* configuration */ int max_recv_dlength; int max_xmit_dlength; int hdrdgst_en; int datadgst_en; /* old values for socket callbacks */ void (*old_data_ready)(struct sock *, int); void (*old_state_change)(struct sock *); void (*old_write_space)(struct sock *); }; 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 Conn. */ spinlock_t conn_lock; spinlock_t lock; volatile int state; struct list_head item; void *auth_client; iscsi_snx_t handle; /* CP session handle */ int conn_cnt; volatile int generation; struct list_head connections; /* list of connects. */ 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; }; struct iscsi_data_task { struct iscsi_data hdr; /* PDU */ char hdrext[sizeof(__u32)]; /* Header-Digest */ struct list_head item; /* data queue item */ }; #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 */ volatile 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_cmd_task { struct iscsi_cmd hdr; /* orig. SCSI PDU */ char hdrext[4*sizeof(__u16)+ /* one AHS */ sizeof(__u32)]; /* Header-Digest */ int itt; /* this ITT */ int datasn; /* DataSN numbering */ struct iscsi_buf headbuf; /* Header Buffer */ 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; volatile int in_progress; /* State machine */ volatile int xmstate; /* Xmit State machine */ int imm_count; /* Imm-Data bytes */ int unsol_count; /* Imm-Data-Out bytes */ int r2t_data_count; /* R2T Data-Out bytes */ int data_count; /* Remaining Data-Out */ struct scsi_cmnd *sc; /* Assoc. SCSI cmnd */ int total_length; int data_offset; struct iscsi_conn *conn; /* used connection */ 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; }; #endif /* ISCSI_H */ --------------010907000305040105070201--