2 * Copyright (c) 2011 NetApp, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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32 #define VRING_ALIGN 4096
34 #define VRING_DESC_F_NEXT (1 << 0)
35 #define VRING_DESC_F_WRITE (1 << 1)
36 #define VRING_DESC_F_INDIRECT (1 << 2)
38 #define VRING_AVAIL_F_NO_INTERRUPT 1
39 #define VIRTIO_MSI_NO_VECTOR 0xFFFF
54 * PFN register shift amount
61 #define VIRTIO_TYPE_NET 1
62 #define VIRTIO_TYPE_BLOCK 2
65 * PCI vendor/device IDs
67 #define VIRTIO_VENDOR 0x1AF4
68 #define VIRTIO_DEV_NET 0x1000
69 #define VIRTIO_DEV_BLOCK 0x1001
72 * PCI config space constants
74 #define VTCFG_R_HOSTCAP 0
75 #define VTCFG_R_GUESTCAP 4
77 #define VTCFG_R_QNUM 12
78 #define VTCFG_R_QSEL 14
79 #define VTCFG_R_QNOTIFY 16
80 #define VTCFG_R_STATUS 18
81 #define VTCFG_R_ISR 19
82 #define VTCFG_R_CFGVEC 20
83 #define VTCFG_R_QVEC 22
84 #define VTCFG_R_CFG0 20 /* No MSI-X */
85 #define VTCFG_R_CFG1 24 /* With MSI-X */
86 #define VTCFG_R_MSIX 20
88 /* From section 2.3, "Virtqueue Configuration", of the virtio specification */
94 size = sizeof(struct virtio_desc) * qsz + sizeof(uint16_t) * (3 + qsz);
95 size = roundup2(size, VRING_ALIGN);
97 size += sizeof(uint16_t) * 3 + sizeof(struct virtio_used) * qsz;
98 size = roundup2(size, VRING_ALIGN);
103 #endif /* _VIRTIO_H_ */