* iSCSI Initiator TCP Transport
* Copyright (C) 2004 Dmitry Yusupov
* Copyright (C) 2004 Alex Aizman
- * Copyright (C) 2005 - 2006 Mike Christie
- * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2005 Mike Christie
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
#ifndef ISCSI_TCP_H
#define ISCSI_TCP_H
-#include <scsi/libiscsi.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_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_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
-struct socket;
+#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_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_tcp_conn {
- struct iscsi_conn *iscsi_conn;
- struct socket *sock;
+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 */
/* old values for socket callbacks */
void (*old_data_ready)(struct sock *, int);
/* 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 custom statistics */
+ /* 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;
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;
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_tcp_mgmt_task {
- struct iscsi_hdr hdr;
- char hdrext[sizeof(__u32)]; /* Header-Digest */
+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 {
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_tcp_cmd_task {
- struct iscsi_cmd hdr;
+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 pad_count; /* padded bytes */
+ int itt; /* this ITT */
+ int datasn; /* DataSN */
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*/
- struct iscsi_data_task unsol_dtask; /* unsol data task */
- int digest_offset; /* for partial buff digest */
+ struct iscsi_data_task *dtask; /* data task in progress*/
+ int digest_offset; /* for partial buff digest */
};
#endif /* ISCSI_H */
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