--- /dev/null
+/*
+ * 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 */
projects / linux-2.6-omap-h63xx.git / commitdiff