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137 lines
5.0 KiB
Go
137 lines
5.0 KiB
Go
package virtio
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// Feature contains feature bits that describe a virtio device or driver.
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type Feature uint64
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// Device-independent feature bits.
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//
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// Source: https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-6600006
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const (
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// FeatureIndirectDescriptors indicates that the driver can use descriptors
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// with an additional layer of indirection.
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FeatureIndirectDescriptors Feature = 1 << 28
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// FeatureVersion1 indicates compliance with version 1.0 of the virtio
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// specification.
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FeatureVersion1 Feature = 1 << 32
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)
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// Feature bits for networking devices.
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//
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// Source: https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-2200003
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const (
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// FeatureNetDeviceCsum indicates that the device can handle packets with
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// partial checksum (checksum offload).
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FeatureNetDeviceCsum Feature = 1 << 0
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// FeatureNetDriverCsum indicates that the driver can handle packets with
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// partial checksum.
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FeatureNetDriverCsum Feature = 1 << 1
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// FeatureNetCtrlDriverOffloads indicates support for dynamic offload state
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// reconfiguration.
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FeatureNetCtrlDriverOffloads Feature = 1 << 2
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// FeatureNetMTU indicates that the device reports a maximum MTU value.
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FeatureNetMTU Feature = 1 << 3
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// FeatureNetMAC indicates that the device provides a MAC address.
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FeatureNetMAC Feature = 1 << 5
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// FeatureNetDriverTSO4 indicates that the driver supports the TCP
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// segmentation offload for received IPv4 packets.
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FeatureNetDriverTSO4 Feature = 1 << 7
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// FeatureNetDriverTSO6 indicates that the driver supports the TCP
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// segmentation offload for received IPv6 packets.
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FeatureNetDriverTSO6 Feature = 1 << 8
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// FeatureNetDriverECN indicates that the driver supports the TCP
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// segmentation offload with ECN for received packets.
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FeatureNetDriverECN Feature = 1 << 9
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// FeatureNetDriverUFO indicates that the driver supports the UDP
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// fragmentation offload for received packets.
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FeatureNetDriverUFO Feature = 1 << 10
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// FeatureNetDeviceTSO4 indicates that the device supports the TCP
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// segmentation offload for received IPv4 packets.
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FeatureNetDeviceTSO4 Feature = 1 << 11
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// FeatureNetDeviceTSO6 indicates that the device supports the TCP
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// segmentation offload for received IPv6 packets.
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FeatureNetDeviceTSO6 Feature = 1 << 12
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// FeatureNetDeviceECN indicates that the device supports the TCP
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// segmentation offload with ECN for received packets.
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FeatureNetDeviceECN Feature = 1 << 13
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// FeatureNetDeviceUFO indicates that the device supports the UDP
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// fragmentation offload for received packets.
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FeatureNetDeviceUFO Feature = 1 << 14
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// FeatureNetMergeRXBuffers indicates that the driver can handle merged
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// receive buffers.
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// When this feature is negotiated, devices may merge multiple descriptor
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// chains together to transport large received packets. [NetHdr.NumBuffers]
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// will then contain the number of merged descriptor chains.
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FeatureNetMergeRXBuffers Feature = 1 << 15
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// FeatureNetStatus indicates that the device configuration status field is
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// available.
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FeatureNetStatus Feature = 1 << 16
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// FeatureNetCtrlVQ indicates that a control channel virtqueue is
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// available.
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FeatureNetCtrlVQ Feature = 1 << 17
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// FeatureNetCtrlRX indicates support for RX mode control (e.g. promiscuous
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// or all-multicast) for packet receive filtering.
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FeatureNetCtrlRX Feature = 1 << 18
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// FeatureNetCtrlVLAN indicates support for VLAN filtering through the
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// control channel.
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FeatureNetCtrlVLAN Feature = 1 << 19
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// FeatureNetDriverAnnounce indicates that the driver can send gratuitous
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// packets.
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FeatureNetDriverAnnounce Feature = 1 << 21
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// FeatureNetMQ indicates that the device supports multiqueue with automatic
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// receive steering.
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FeatureNetMQ Feature = 1 << 22
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// FeatureNetCtrlMACAddr indicates that the MAC address can be set through
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// the control channel.
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FeatureNetCtrlMACAddr Feature = 1 << 23
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// FeatureNetDeviceUSO indicates that the device supports the UDP
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// segmentation offload for received packets.
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FeatureNetDeviceUSO Feature = 1 << 56
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// FeatureNetHashReport indicates that the device can report a per-packet
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// hash value and type.
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FeatureNetHashReport Feature = 1 << 57
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// FeatureNetDriverHdrLen indicates that the driver can provide the exact
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// header length value (see [NetHdr.HdrLen]).
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// Devices may benefit from knowing the exact header length.
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FeatureNetDriverHdrLen Feature = 1 << 59
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// FeatureNetRSS indicates that the device supports RSS (receive-side
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// scaling) with configurable hash parameters.
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FeatureNetRSS Feature = 1 << 60
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// FeatureNetRSCExt indicates that the device can process duplicated ACKs
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// and report the number of coalesced segments and duplicated ACKs.
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FeatureNetRSCExt Feature = 1 << 61
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// FeatureNetStandby indicates that the device may act as a standby for a
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// primary device with the same MAC address.
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FeatureNetStandby Feature = 1 << 62
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// FeatureNetSpeedDuplex indicates that the device can report link speed and
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// duplex mode.
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FeatureNetSpeedDuplex Feature = 1 << 63
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)
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