91039bb268
This seems prudent to do in its own right but it also opens up the possibility of not having to mmap the entire guest address space in the 'bhyve' process context. Discussed with: grehan Obtained from: NetApp
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*-
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* Copyright (c) 2011 NetApp, Inc.
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_H_
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#define _VIRTIO_H_
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#define VRING_ALIGN 4096
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#define VRING_DESC_F_NEXT (1 << 0)
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#define VRING_DESC_F_WRITE (1 << 1)
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#define VRING_DESC_F_INDIRECT (1 << 2)
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#define VRING_AVAIL_F_NO_INTERRUPT 1
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#define VIRTIO_MSI_NO_VECTOR 0xFFFF
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struct virtio_desc {
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uint64_t vd_addr;
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uint32_t vd_len;
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uint16_t vd_flags;
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uint16_t vd_next;
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} __packed;
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struct virtio_used {
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uint32_t vu_idx;
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uint32_t vu_tlen;
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} __packed;
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/*
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* PFN register shift amount
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*/
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#define VRING_PFN 12
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/*
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* Virtio device types
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*/
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#define VIRTIO_TYPE_NET 1
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#define VIRTIO_TYPE_BLOCK 2
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/*
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* PCI vendor/device IDs
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*/
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#define VIRTIO_VENDOR 0x1AF4
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#define VIRTIO_DEV_NET 0x1000
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#define VIRTIO_DEV_BLOCK 0x1001
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/*
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* PCI config space constants
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*/
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#define VTCFG_R_HOSTCAP 0
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#define VTCFG_R_GUESTCAP 4
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#define VTCFG_R_PFN 8
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#define VTCFG_R_QNUM 12
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#define VTCFG_R_QSEL 14
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#define VTCFG_R_QNOTIFY 16
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#define VTCFG_R_STATUS 18
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#define VTCFG_R_ISR 19
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#define VTCFG_R_CFGVEC 20
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#define VTCFG_R_QVEC 22
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#define VTCFG_R_CFG0 20 /* No MSI-X */
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#define VTCFG_R_CFG1 24 /* With MSI-X */
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#define VTCFG_R_MSIX 20
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/* From section 2.3, "Virtqueue Configuration", of the virtio specification */
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static inline u_int
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vring_size(u_int qsz)
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{
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u_int size;
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size = sizeof(struct virtio_desc) * qsz + sizeof(uint16_t) * (3 + qsz);
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size = roundup2(size, VRING_ALIGN);
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size += sizeof(uint16_t) * 3 + sizeof(struct virtio_used) * qsz;
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size = roundup2(size, VRING_ALIGN);
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return (size);
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}
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#endif /* _VIRTIO_H_ */
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