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_virtqueue for the cmd */
  27        struct vhost_virtqueue *tvc_vq;
  28        /* Pointer to vhost nexus memory */
  29        struct tcm_vhost_nexus *tvc_nexus;
  30        /* The TCM I/O descriptor that is accessed via container_of() */
  31        struct se_cmd tvc_se_cmd;
  32        /* work item used for cmwq dispatch to tcm_vhost_submission_work() */
  33        struct work_struct work;
  34        /* Copy of the incoming SCSI command descriptor block (CDB) */
  35        unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE];
  36        /* Sense buffer that will be mapped into outgoing status */
  37        unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
  38        /* Completed commands list, serviced from vhost worker thread */
  39        struct llist_node tvc_completion_list;
  40};
  41
  42struct tcm_vhost_nexus {
  43        /* Pointer to TCM session for I_T Nexus */
  44        struct se_session *tvn_se_sess;
  45};
  46
  47struct tcm_vhost_nacl {
  48        /* Binary World Wide unique Port Name for Vhost Initiator port */
  49        u64 iport_wwpn;
  50        /* ASCII formatted WWPN for Sas Initiator port */
  51        char iport_name[TCM_VHOST_NAMELEN];
  52        /* Returned by tcm_vhost_make_nodeacl() */
  53        struct se_node_acl se_node_acl;
  54};
  55
  56struct tcm_vhost_tpg {
  57        /* Vhost port target portal group tag for TCM */
  58        u16 tport_tpgt;
  59        /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
  60        int tv_tpg_port_count;
  61        /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
  62        int tv_tpg_vhost_count;
  63        /* list for tcm_vhost_list */
  64        struct list_head tv_tpg_list;
  65        /* Used to protect access for tpg_nexus */
  66        struct mutex tv_tpg_mutex;
  67        /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
  68        struct tcm_vhost_nexus *tpg_nexus;
  69        /* Pointer back to tcm_vhost_tport */
  70        struct tcm_vhost_tport *tport;
  71        /* Returned by tcm_vhost_make_tpg() */
  72        struct se_portal_group se_tpg;
  73};
  74
  75struct tcm_vhost_tport {
  76        /* SCSI protocol the tport is providing */
  77        u8 tport_proto_id;
  78        /* Binary World Wide unique Port Name for Vhost Target port */
  79        u64 tport_wwpn;
  80        /* ASCII formatted WWPN for Vhost Target port */
  81        char tport_name[TCM_VHOST_NAMELEN];
  82        /* Returned by tcm_vhost_make_tport() */
  83        struct se_wwn tport_wwn;
  84};
  85
  86/*
  87 * As per request from MST, keep TCM_VHOST related ioctl defines out of
  88 * linux/vhost.h (user-space) for now..
  89 */
  90
  91#include <linux/vhost.h>
  92
  93/*
  94 * Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
  95 *
  96 * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
  97 *            RFC-v2 vhost-scsi userspace.  Add GET_ABI_VERSION ioctl usage
  98 * ABI Rev 1: January 2013. Ignore vhost_tpgt filed in struct vhost_scsi_target.
  99 *            All the targets under vhost_wwpn can be seen and used by guset.
 100 */
 101
 102#define VHOST_SCSI_ABI_VERSION  1
 103
 104struct vhost_scsi_target {
 105        int abi_version;
 106        char vhost_wwpn[TRANSPORT_IQN_LEN];
 107        unsigned short vhost_tpgt;
 108        unsigned short reserved;
 109};
 110
 111/* VHOST_SCSI specific defines */
 112#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
 113#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
 114/* Changing this breaks userspace. */
 115#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
 116
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