iscsi-tcp.h.patch - drivers/scsi/iscsi_tcp.h, header file.
Signed-off-by: Alex Aizman <[email protected]>
Signed-off-by: Dmitry Yusupov <[email protected]>
Signed-off-by: Mike Christie <[email protected]>
Index: drivers/scsi/iscsi_tcp.h
===================================================================
--- /dev/null (tree:7570fde464d579ce455c865f07a613e967e9396c)
+++ uncommitted/drivers/scsi/iscsi_tcp.h (mode:100644 sha1:82dcf8dada8e223e55acec92f54eb2473460d086)
@@ -0,0 +1,291 @@
+/*
+ * iSCSI Initiator TCP Transport
+ * Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
+ * maintained by [email protected]
+ *
+ * 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 <scsi/scsi_transport_iscsi.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_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 XMSTATE_W_PAD 0x200
+
+#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 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 */
+ 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 *);
+
+ /* 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;
+};
+
+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;
+ 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 */
+ char pad[ISCSI_PAD_LEN];
+ 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 */
+ int pad_count; /* Padded bytes */
+ 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 */
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