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