ceph/src/spdk/dpdk/examples/vhost_scsi/vhost_scsi.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2017 Intel Corporation
   3  */
   4
   5 #ifndef _VHOST_SCSI_H_
   6 #define _VHOST_SCSI_H_
   7
   8 #include <sys/uio.h>
   9 #include <stdint.h>
  10 #include <linux/virtio_scsi.h>
  11 #include <linux/virtio_ring.h>
  12
  13 #include <rte_vhost.h>
  14
  15 struct vhost_scsi_queue {
  16         struct rte_vhost_vring vq;
  17         uint16_t last_avail_idx;
  18         uint16_t last_used_idx;
  19 };
  20
  21 #define NUM_OF_SCSI_QUEUES 3
  22
  23 struct vhost_block_dev {
  24         /** ID for vhost library. */
  25         int vid;
  26         /** Queues for the block device */
  27         struct vhost_scsi_queue queues[NUM_OF_SCSI_QUEUES];
  28         /** Unique name for this block device. */
  29         char name[64];
  30
  31         /** Unique product name for this kind of block device. */
  32         char product_name[256];
  33
  34         /** Size in bytes of a logical block for the backend */
  35         uint32_t blocklen;
  36
  37         /** Number of blocks */
  38         uint64_t blockcnt;
  39
  40         /** write cache enabled, not used at the moment */
  41         int write_cache;
  42
  43         /** use memory as disk storage space */
  44         uint8_t *data;
  45 };
  46
  47 struct vhost_scsi_ctrlr {
  48         /** Only support 1 LUN for the example */
  49         struct vhost_block_dev *bdev;
  50         /** VM memory region */
  51         struct rte_vhost_memory *mem;
  52 } __rte_cache_aligned;
  53
  54 #define VHOST_SCSI_MAX_IOVS 128
  55
  56 enum scsi_data_dir {
  57         SCSI_DIR_NONE = 0,
  58         SCSI_DIR_TO_DEV = 1,
  59         SCSI_DIR_FROM_DEV = 2,
  60 };
  61
  62 struct vhost_scsi_task {
  63         int req_idx;
  64         uint32_t dxfer_dir;
  65         uint32_t data_len;
  66         struct virtio_scsi_cmd_req *req;
  67         struct virtio_scsi_cmd_resp *resp;
  68         struct iovec iovs[VHOST_SCSI_MAX_IOVS];
  69         uint32_t iovs_cnt;
  70         struct vring_desc *desc;
  71         struct rte_vhost_vring *vq;
  72         struct vhost_block_dev *bdev;
  73         struct vhost_scsi_ctrlr *ctrlr;
  74 };
  75
  76 int vhost_bdev_process_scsi_commands(struct vhost_block_dev *bdev,
  77                                      struct vhost_scsi_task *task);
  78
  79 #endif /* _VHOST_SCSI_H_ */