xref: /linux/drivers/target/iscsi/iscsi_target_seq_pdu_list.h (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
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  
48  struct iscsi_build_list {
49  	int		data_direction;
50  	int		randomize;
51  	int		type;
52  	int		immediate_data_length;
53  };
54  
55  struct 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  
66  struct 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  
85  struct iscsit_cmd;
86  
87  extern int iscsit_build_pdu_and_seq_lists(struct iscsit_cmd *, u32);
88  extern struct iscsi_pdu *iscsit_get_pdu_holder(struct iscsit_cmd *, u32, u32);
89  extern struct iscsi_pdu *iscsit_get_pdu_holder_for_seq(struct iscsit_cmd *, struct iscsi_seq *);
90  extern struct iscsi_seq *iscsit_get_seq_holder(struct iscsit_cmd *, u32, u32);
91  
92  #endif /* ISCSI_SEQ_AND_PDU_LIST_H */
93