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Diffstat (limited to 'examples/vhost_scsi/vhost_scsi.h')
| -rw-r--r-- | examples/vhost_scsi/vhost_scsi.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/examples/vhost_scsi/vhost_scsi.h b/examples/vhost_scsi/vhost_scsi.h new file mode 100644 index 00000000..edb416da --- /dev/null +++ b/examples/vhost_scsi/vhost_scsi.h @@ -0,0 +1,108 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2017 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#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_ */ |