mirror of https://github.com/F-Stack/f-stack.git
109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _VHOST_SCSI_H_
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#define _VHOST_SCSI_H_
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#include <sys/uio.h>
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#include <stdint.h>
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#include <linux/virtio_scsi.h>
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#include <linux/virtio_ring.h>
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#include <rte_vhost.h>
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struct vhost_scsi_queue {
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struct rte_vhost_vring vq;
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uint16_t last_avail_idx;
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uint16_t last_used_idx;
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};
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#define NUM_OF_SCSI_QUEUES 3
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struct vhost_block_dev {
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/** ID for vhost library. */
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int vid;
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/** Queues for the block device */
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struct vhost_scsi_queue queues[NUM_OF_SCSI_QUEUES];
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/** Unique name for this block device. */
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char name[64];
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/** Unique product name for this kind of block device. */
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char product_name[256];
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/** Size in bytes of a logical block for the backend */
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uint32_t blocklen;
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/** Number of blocks */
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uint64_t blockcnt;
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/** write cache enabled, not used at the moment */
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int write_cache;
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/** use memory as disk storage space */
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uint8_t *data;
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};
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struct vhost_scsi_ctrlr {
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/** Only support 1 LUN for the example */
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struct vhost_block_dev *bdev;
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/** VM memory region */
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struct rte_vhost_memory *mem;
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} __rte_cache_aligned;
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#define VHOST_SCSI_MAX_IOVS 128
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enum scsi_data_dir {
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SCSI_DIR_NONE = 0,
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SCSI_DIR_TO_DEV = 1,
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SCSI_DIR_FROM_DEV = 2,
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};
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struct vhost_scsi_task {
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int req_idx;
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uint32_t dxfer_dir;
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uint32_t data_len;
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struct virtio_scsi_cmd_req *req;
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struct virtio_scsi_cmd_resp *resp;
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struct iovec iovs[VHOST_SCSI_MAX_IOVS];
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uint32_t iovs_cnt;
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struct vring_desc *desc;
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struct rte_vhost_vring *vq;
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struct vhost_block_dev *bdev;
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struct vhost_scsi_ctrlr *ctrlr;
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};
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int vhost_bdev_process_scsi_commands(struct vhost_block_dev *bdev,
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struct vhost_scsi_task *task);
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#endif /* _VHOST_SCSI_H_ */
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