root/drivers/target/iscsi/iscsi_target_seq_pdu_list.h

INCLUDED FROM

   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 iscsi_cmd;
  86 
  87 extern int iscsit_build_pdu_and_seq_lists(struct iscsi_cmd *, u32);
  88 extern struct iscsi_pdu *iscsit_get_pdu_holder(struct iscsi_cmd *, u32, u32);
  89 extern struct iscsi_pdu *iscsit_get_pdu_holder_for_seq(struct iscsi_cmd *, struct iscsi_seq *);
  90 extern struct iscsi_seq *iscsit_get_seq_holder(struct iscsi_cmd *, u32, u32);
  91 
  92 #endif /* ISCSI_SEQ_AND_PDU_LIST_H */