diff options
Diffstat (limited to 'usr.sbin/bhyve/virtio.h')
| -rw-r--r-- | usr.sbin/bhyve/virtio.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/virtio.h b/usr.sbin/bhyve/virtio.h index 04ef586..fe6fb1a 100644 --- a/usr.sbin/bhyve/virtio.h +++ b/usr.sbin/bhyve/virtio.h @@ -85,4 +85,19 @@ struct virtio_used { #define VTCFG_R_CFG1 24 /* With MSI-X */ #define VTCFG_R_MSIX 20 +/* From section 2.3, "Virtqueue Configuration", of the virtio specification */ +static inline u_int +vring_size(u_int qsz) +{ + u_int size; + + size = sizeof(struct virtio_desc) * qsz + sizeof(uint16_t) * (3 + qsz); + size = roundup2(size, VRING_ALIGN); + + size += sizeof(uint16_t) * 3 + sizeof(struct virtio_used) * qsz; + size = roundup2(size, VRING_ALIGN); + + return (size); +} + #endif /* _VIRTIO_H_ */ |
