linux/drivers/vhost/tcm_vhost.h
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   1#define TCM_VHOST_VERSION  "v0.1"
   2#define TCM_VHOST_NAMELEN 256
   3#define TCM_VHOST_MAX_CDB_SIZE 32
   4
   5struct tcm_vhost_cmd {
   6        /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
   7        int tvc_vq_desc;
   8        /* virtio-scsi initiator task attribute */
   9        int tvc_task_attr;
  10        /* virtio-scsi initiator data direction */
  11        enum dma_data_direction tvc_data_direction;
  12        /* Expected data transfer length from virtio-scsi header */
  13        u32 tvc_exp_data_len;
  14        /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
  15        u64 tvc_tag;
  16        /* The number of scatterlists associated with this cmd */
  17        u32 tvc_sgl_count;
  18        /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
  19        u32 tvc_lun;
  20        /* Pointer to the SGL formatted memory from virtio-scsi */
  21        struct scatterlist *tvc_sgl;
  22        /* Pointer to response */
  23        struct virtio_scsi_cmd_resp __user *tvc_resp;
  24        /* Pointer to vhost_scsi for our device */
  25        struct vhost_scsi *tvc_vhost;
  26        /* Pointer to vhost nexus memory */
  27        struct tcm_vhost_nexus *tvc_nexus;
  28        /* The TCM I/O descriptor that is accessed via container_of() */
  29        struct se_cmd tvc_se_cmd;
  30        /* work item used for cmwq dispatch to tcm_vhost_submission_work() */
  31        struct work_struct work;
  32        /* Copy of the incoming SCSI command descriptor block (CDB) */
  33        unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE];
  34        /* Sense buffer that will be mapped into outgoing status */
  35        unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
  36        /* Completed commands list, serviced from vhost worker thread */
  37        struct list_head tvc_completion_list;
  38};
  39
  40struct tcm_vhost_nexus {
  41        /* Pointer to TCM session for I_T Nexus */
  42        struct se_session *tvn_se_sess;
  43};
  44
  45struct tcm_vhost_nacl {
  46        /* Binary World Wide unique Port Name for Vhost Initiator port */
  47        u64 iport_wwpn;
  48        /* ASCII formatted WWPN for Sas Initiator port */
  49        char iport_name[TCM_VHOST_NAMELEN];
  50        /* Returned by tcm_vhost_make_nodeacl() */
  51        struct se_node_acl se_node_acl;
  52};
  53
  54struct tcm_vhost_tpg {
  55        /* Vhost port target portal group tag for TCM */
  56        u16 tport_tpgt;
  57        /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
  58        int tv_tpg_port_count;
  59        /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
  60        int tv_tpg_vhost_count;
  61        /* list for tcm_vhost_list */
  62        struct list_head tv_tpg_list;
  63        /* Used to protect access for tpg_nexus */
  64        struct mutex tv_tpg_mutex;
  65        /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
  66        struct tcm_vhost_nexus *tpg_nexus;
  67        /* Pointer back to tcm_vhost_tport */
  68        struct tcm_vhost_tport *tport;
  69        /* Returned by tcm_vhost_make_tpg() */
  70        struct se_portal_group se_tpg;
  71};
  72
  73struct tcm_vhost_tport {
  74        /* SCSI protocol the tport is providing */
  75        u8 tport_proto_id;
  76        /* Binary World Wide unique Port Name for Vhost Target port */
  77        u64 tport_wwpn;
  78        /* ASCII formatted WWPN for Vhost Target port */
  79        char tport_name[TCM_VHOST_NAMELEN];
  80        /* Returned by tcm_vhost_make_tport() */
  81        struct se_wwn tport_wwn;
  82};
  83
  84/*
  85 * As per request from MST, keep TCM_VHOST related ioctl defines out of
  86 * linux/vhost.h (user-space) for now..
  87 */
  88
  89#include <linux/vhost.h>
  90
  91/*
  92 * Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
  93 *
  94 * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
  95 *            RFC-v2 vhost-scsi userspace.  Add GET_ABI_VERSION ioctl usage
  96 */
  97
  98#define VHOST_SCSI_ABI_VERSION  0
  99
 100struct vhost_scsi_target {
 101        int abi_version;
 102        char vhost_wwpn[TRANSPORT_IQN_LEN];
 103        unsigned short vhost_tpgt;
 104        unsigned short reserved;
 105};
 106
 107/* VHOST_SCSI specific defines */
 108#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
 109#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
 110/* Changing this breaks userspace. */
 111#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
 112
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