* 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
* 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_cls_conn;
-
-struct iscsi_conn {
- struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
- 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 */
+struct iscsi_sw_tcp_conn {
+ struct iscsi_conn *iscsi_conn;
+ struct socket *sock;
+ struct iscsi_sw_tcp_send out;
/* 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 list_head run_list; /* list of cmds in progress */
- 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 */
- int recovery_failed;
- 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;
- 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 list_head running; /* running cmd list */
- 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 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff