include/linux/virtio_scsi.h

   1 #ifndef _LINUX_VIRTIO_SCSI_H
   2 #define _LINUX_VIRTIO_SCSI_H
   3 /* This header is BSD licensed so anyone can use the definitions to implement
   4  * compatible drivers/servers. */
   5
   6 #define VIRTIO_SCSI_CDB_SIZE   32
   7 #define VIRTIO_SCSI_SENSE_SIZE 96
   8
   9 /* SCSI command request, followed by data-out */
  10 struct virtio_scsi_cmd_req {
  11         u8 lun[8];              /* Logical Unit Number */
  12         u64 tag;                /* Command identifier */
  13         u8 task_attr;           /* Task attribute */
  14         u8 prio;
  15         u8 crn;
  16         u8 cdb[VIRTIO_SCSI_CDB_SIZE];
  17 } __packed;
  18
  19 /* Response, followed by sense data and data-in */
  20 struct virtio_scsi_cmd_resp {
  21         u32 sense_len;          /* Sense data length */
  22         u32 resid;              /* Residual bytes in data buffer */
  23         u16 status_qualifier;   /* Status qualifier */
  24         u8 status;              /* Command completion status */
  25         u8 response;            /* Response values */
  26         u8 sense[VIRTIO_SCSI_SENSE_SIZE];
  27 } __packed;
  28
  29 /* Task Management Request */
  30 struct virtio_scsi_ctrl_tmf_req {
  31         u32 type;
  32         u32 subtype;
  33         u8 lun[8];
  34         u64 tag;
  35 } __packed;
  36
  37 struct virtio_scsi_ctrl_tmf_resp {
  38         u8 response;
  39 } __packed;
  40
  41 /* Asynchronous notification query/subscription */
  42 struct virtio_scsi_ctrl_an_req {
  43         u32 type;
  44         u8 lun[8];
  45         u32 event_requested;
  46 } __packed;
  47
  48 struct virtio_scsi_ctrl_an_resp {
  49         u32 event_actual;
  50         u8 response;
  51 } __packed;
  52
  53 struct virtio_scsi_event {
  54         u32 event;
  55         u8 lun[8];
  56         u32 reason;
  57 } __packed;
  58
  59 struct virtio_scsi_config {
  60         u32 num_queues;
  61         u32 seg_max;
  62         u32 max_sectors;
  63         u32 cmd_per_lun;
  64         u32 event_info_size;
  65         u32 sense_size;
  66         u32 cdb_size;
  67         u16 max_channel;
  68         u16 max_target;
  69         u32 max_lun;
  70 } __packed;
  71
  72 /* Feature Bits */
  73 #define VIRTIO_SCSI_F_INOUT                    0
  74 #define VIRTIO_SCSI_F_HOTPLUG                  1
  75 #define VIRTIO_SCSI_F_CHANGE                   2
  76
  77 /* Response codes */
  78 #define VIRTIO_SCSI_S_OK                       0
  79 #define VIRTIO_SCSI_S_OVERRUN                  1
  80 #define VIRTIO_SCSI_S_ABORTED                  2
  81 #define VIRTIO_SCSI_S_BAD_TARGET               3
  82 #define VIRTIO_SCSI_S_RESET                    4
  83 #define VIRTIO_SCSI_S_BUSY                     5
  84 #define VIRTIO_SCSI_S_TRANSPORT_FAILURE        6
  85 #define VIRTIO_SCSI_S_TARGET_FAILURE           7
  86 #define VIRTIO_SCSI_S_NEXUS_FAILURE            8
  87 #define VIRTIO_SCSI_S_FAILURE                  9
  88 #define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED       10
  89 #define VIRTIO_SCSI_S_FUNCTION_REJECTED        11
  90 #define VIRTIO_SCSI_S_INCORRECT_LUN            12
  91
  92 /* Controlq type codes.  */
  93 #define VIRTIO_SCSI_T_TMF                      0
  94 #define VIRTIO_SCSI_T_AN_QUERY                 1
  95 #define VIRTIO_SCSI_T_AN_SUBSCRIBE             2
  96
  97 /* Valid TMF subtypes.  */
  98 #define VIRTIO_SCSI_T_TMF_ABORT_TASK           0
  99 #define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET       1
 100 #define VIRTIO_SCSI_T_TMF_CLEAR_ACA            2
 101 #define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET       3
 102 #define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET      4
 103 #define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET   5
 104 #define VIRTIO_SCSI_T_TMF_QUERY_TASK           6
 105 #define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET       7
 106
 107 /* Events.  */
 108 #define VIRTIO_SCSI_T_EVENTS_MISSED            0x80000000
 109 #define VIRTIO_SCSI_T_NO_EVENT                 0
 110 #define VIRTIO_SCSI_T_TRANSPORT_RESET          1
 111 #define VIRTIO_SCSI_T_ASYNC_NOTIFY             2
 112 #define VIRTIO_SCSI_T_PARAM_CHANGE             3
 113
 114 /* Reasons of transport reset event */
 115 #define VIRTIO_SCSI_EVT_RESET_HARD             0
 116 #define VIRTIO_SCSI_EVT_RESET_RESCAN           1
 117 #define VIRTIO_SCSI_EVT_RESET_REMOVED          2
 118
 119 #define VIRTIO_SCSI_S_SIMPLE                   0
 120 #define VIRTIO_SCSI_S_ORDERED                  1
 121 #define VIRTIO_SCSI_S_HEAD                     2
 122 #define VIRTIO_SCSI_S_ACA                      3
 123
 124
 125 #endif /* _LINUX_VIRTIO_SCSI_H */