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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2017 Intel Corporation
*/
#ifndef _VHOST_SCSI_H_
#define _VHOST_SCSI_H_
#include <sys/uio.h>
#include <stdint.h>
#include <linux/virtio_scsi.h>
#include <linux/virtio_ring.h>
#include <rte_vhost.h>
struct vhost_scsi_queue {
struct rte_vhost_vring vq;
uint16_t last_avail_idx;
uint16_t last_used_idx;
};
#define NUM_OF_SCSI_QUEUES 3
struct vhost_block_dev {
/** ID for vhost library. */
int vid;
/** Queues for the block device */
struct vhost_scsi_queue queues[NUM_OF_SCSI_QUEUES];
/** Unique name for this block device. */
char name[64];
/** Unique product name for this kind of block device. */
char product_name[256];
/** Size in bytes of a logical block for the backend */
uint32_t blocklen;
/** Number of blocks */
uint64_t blockcnt;
/** write cache enabled, not used at the moment */
int write_cache;
/** use memory as disk storage space */
uint8_t *data;
};
struct vhost_scsi_ctrlr {
/** Only support 1 LUN for the example */
struct vhost_block_dev *bdev;
/** VM memory region */
struct rte_vhost_memory *mem;
} __rte_cache_aligned;
#define VHOST_SCSI_MAX_IOVS 128
enum scsi_data_dir {
SCSI_DIR_NONE = 0,
SCSI_DIR_TO_DEV = 1,
SCSI_DIR_FROM_DEV = 2,
};
struct vhost_scsi_task {
int req_idx;
uint32_t dxfer_dir;
uint32_t data_len;
struct virtio_scsi_cmd_req *req;
struct virtio_scsi_cmd_resp *resp;
struct iovec iovs[VHOST_SCSI_MAX_IOVS];
uint32_t iovs_cnt;
struct vring_desc *desc;
struct rte_vhost_vring *vq;
struct vhost_block_dev *bdev;
struct vhost_scsi_ctrlr *ctrlr;
};
int vhost_bdev_process_scsi_commands(struct vhost_block_dev *bdev,
struct vhost_scsi_task *task);
#endif /* _VHOST_SCSI_H_ */
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