1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef ISCSI_SEQ_AND_PDU_LIST_H
3#define ISCSI_SEQ_AND_PDU_LIST_H
4
5#include <linux/types.h>
6#include <linux/cache.h>
7
8/* struct iscsi_pdu->status */
9#define DATAOUT_PDU_SENT			1
10
11/* struct iscsi_seq->type */
12#define SEQTYPE_IMMEDIATE			1
13#define SEQTYPE_UNSOLICITED			2
14#define SEQTYPE_NORMAL				3
15
16/* struct iscsi_seq->status */
17#define DATAOUT_SEQUENCE_GOT_R2T		1
18#define DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY 2
19#define DATAOUT_SEQUENCE_COMPLETE		3
20
21/* iscsi_determine_counts_for_list() type */
22#define PDULIST_NORMAL				1
23#define PDULIST_IMMEDIATE			2
24#define PDULIST_UNSOLICITED			3
25#define PDULIST_IMMEDIATE_AND_UNSOLICITED	4
26
27/* struct iscsi_pdu->type */
28#define PDUTYPE_IMMEDIATE			1
29#define PDUTYPE_UNSOLICITED			2
30#define PDUTYPE_NORMAL				3
31
32/* struct iscsi_pdu->status */
33#define ISCSI_PDU_NOT_RECEIVED			0
34#define ISCSI_PDU_RECEIVED_OK			1
35#define ISCSI_PDU_CRC_FAILED			2
36#define ISCSI_PDU_TIMED_OUT			3
37
38/* struct iscsi_build_list->randomize */
39#define RANDOM_DATAIN_PDU_OFFSETS		0x01
40#define RANDOM_DATAIN_SEQ_OFFSETS		0x02
41#define RANDOM_DATAOUT_PDU_OFFSETS		0x04
42#define RANDOM_R2T_OFFSETS			0x08
43
44/* struct iscsi_build_list->data_direction */
45#define ISCSI_PDU_READ				0x01
46#define ISCSI_PDU_WRITE				0x02
47
48struct iscsi_build_list {
49	int		data_direction;
50	int		randomize;
51	int		type;
52	int		immediate_data_length;
53};
54
55struct iscsi_pdu {
56	int		status;
57	int		type;
58	u8		flags;
59	u32		data_sn;
60	u32		length;
61	u32		offset;
62	u32		pdu_send_order;
63	u32		seq_no;
64} ____cacheline_aligned;
65
66struct iscsi_seq {
67	int		sent;
68	int		status;
69	int		type;
70	u32		data_sn;
71	u32		first_datasn;
72	u32		last_datasn;
73	u32		next_burst_len;
74	u32		pdu_start;
75	u32		pdu_count;
76	u32		offset;
77	u32		orig_offset;
78	u32		pdu_send_order;
79	u32		r2t_sn;
80	u32		seq_send_order;
81	u32		seq_no;
82	u32		xfer_len;
83} ____cacheline_aligned;
84
85struct iscsit_cmd;
86
87extern int iscsit_build_pdu_and_seq_lists(struct iscsit_cmd *, u32);
88extern struct iscsi_pdu *iscsit_get_pdu_holder(struct iscsit_cmd *, u32, u32);
89extern struct iscsi_pdu *iscsit_get_pdu_holder_for_seq(struct iscsit_cmd *, struct iscsi_seq *);
90extern struct iscsi_seq *iscsit_get_seq_holder(struct iscsit_cmd *, u32, u32);
91
92#endif /* ISCSI_SEQ_AND_PDU_LIST_H */
93