/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ISCSI_SEQ_AND_PDU_LIST_H
#define ISCSI_SEQ_AND_PDU_LIST_H

#include <linux/types.h>
#include <linux/cache.h>

/* struct iscsi_pdu->status */
#define DATAOUT_PDU_SENT                        1

/* struct iscsi_seq->type */
#define SEQTYPE_IMMEDIATE                       1
#define SEQTYPE_UNSOLICITED                     2
#define SEQTYPE_NORMAL                          3

/* struct iscsi_seq->status */
#define DATAOUT_SEQUENCE_GOT_R2T                1
#define DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY 2
#define DATAOUT_SEQUENCE_COMPLETE               3

/* iscsi_determine_counts_for_list() type */
#define PDULIST_NORMAL                          1
#define PDULIST_IMMEDIATE                       2
#define PDULIST_UNSOLICITED                     3
#define PDULIST_IMMEDIATE_AND_UNSOLICITED       4

/* struct iscsi_pdu->type */
#define PDUTYPE_IMMEDIATE                       1
#define PDUTYPE_UNSOLICITED                     2
#define PDUTYPE_NORMAL                          3

/* struct iscsi_pdu->status */
#define ISCSI_PDU_NOT_RECEIVED                  0
#define ISCSI_PDU_RECEIVED_OK                   1
#define ISCSI_PDU_CRC_FAILED                    2
#define ISCSI_PDU_TIMED_OUT                     3

/* struct iscsi_build_list->randomize */
#define RANDOM_DATAIN_PDU_OFFSETS               0x01
#define RANDOM_DATAIN_SEQ_OFFSETS               0x02
#define RANDOM_DATAOUT_PDU_OFFSETS              0x04
#define RANDOM_R2T_OFFSETS                      0x08

/* struct iscsi_build_list->data_direction */
#define ISCSI_PDU_READ                          0x01
#define ISCSI_PDU_WRITE                         0x02

struct iscsi_build_list {
        int             data_direction;
        int             randomize;
        int             type;
        int             immediate_data_length;
};

struct iscsi_pdu {
        int             status;
        int             type;
        u8              flags;
        u32             data_sn;
        u32             length;
        u32             offset;
        u32             pdu_send_order;
        u32             seq_no;
} ____cacheline_aligned;

struct iscsi_seq {
        int             sent;
        int             status;
        int             type;
        u32             data_sn;
        u32             first_datasn;
        u32             last_datasn;
        u32             next_burst_len;
        u32             pdu_start;
        u32             pdu_count;
        u32             offset;
        u32             orig_offset;
        u32             pdu_send_order;
        u32             r2t_sn;
        u32             seq_send_order;
        u32             seq_no;
        u32             xfer_len;
} ____cacheline_aligned;

struct iscsit_cmd;

extern int iscsit_build_pdu_and_seq_lists(struct iscsit_cmd *, u32);
extern struct iscsi_pdu *iscsit_get_pdu_holder(struct iscsit_cmd *, u32, u32);
extern struct iscsi_pdu *iscsit_get_pdu_holder_for_seq(struct iscsit_cmd *, struct iscsi_seq *);
extern struct iscsi_seq *iscsit_get_seq_holder(struct iscsit_cmd *, u32, u32);

#endif /* ISCSI_SEQ_AND_PDU_LIST_H */